Assisted Deletion of Related Content Srdjan Hubert Ritzdorf - - PowerPoint PPT Presentation

▶
assisted deletion of related content
SMART_READER_LITE
LIVE PREVIEW

Assisted Deletion of Related Content Srdjan Hubert Ritzdorf - - PowerPoint PPT Presentation

Feb 03, 2023 383 likes •1.05k views

Assisted Deletion of Related Content Srdjan Hubert Ritzdorf Nikolaos Karapanos Capkun Institute of Information Security Department of Computer Science ETH Zurich, Switzerland hubert.ritzdorf@inf.ethz.ch Assisted Deletion of Related

slide-1
SLIDE 1

Assisted Deletion of Related Content

Hubert Ritzdorf Nikolaos Karapanos Srdjan ˇ Capkun

Institute of Information Security Department of Computer Science ETH Zurich, Switzerland hubert.ritzdorf@inf.ethz.ch

Assisted Deletion of Related Content December 11, 2014 1

slide-2
SLIDE 2

Introduction

A: Original T ext

Loram ipsam dolor sit amit, consectetur adipisicing.. Assisted Deletion of Related Content December 11, 2014 2

slide-3
SLIDE 3

Introduction

A: Original T ext B: Modified T ext

Loram ipsam dolor sit amit, consectetur adipisicing.. Lorem ipsum dolor sit amet, consectetur adipisicing.. Assisted Deletion of Related Content December 11, 2014 2

slide-4
SLIDE 4

Introduction

C: Original Image A: Original T ext B: Modified T ext

Loram ipsam dolor sit amit, consectetur adipisicing.. Lorem ipsum dolor sit amet, consectetur adipisicing..

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 2

slide-5
SLIDE 5

Introduction

D: Gray Image C: Original Image A: Original T ext B: Modified T ext

Loram ipsam dolor sit amit, consectetur adipisicing.. Lorem ipsum dolor sit amet, consectetur adipisicing..

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 2

slide-6
SLIDE 6

Introduction

E: PDF D: Gray Image C: Original Image A: Original T ext B: Modified T ext

Loram ipsam dolor sit amit, consectetur adipisicing.. Lorem ipsum dolor sit amet, consectetur adipisicing..

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x) PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 2

slide-7
SLIDE 7

Introduction

E: PDF D: Gray Image C: Original Image A: Original T ext B: Modified T ext

Loram ipsam dolor sit amit, consectetur adipisicing.. Lorem ipsum dolor sit amet, consectetur adipisicing..

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x) PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

User wants to securely (irrecoverably) delete PDF content

Assisted Deletion of Related Content December 11, 2014 2

slide-8
SLIDE 8

Introduction

E: PDF D: Gray Image C: Original Image A: Original T ext B: Modified T ext

Loram ipsam dolor sit amit, consectetur adipisicing.. Lorem ipsum dolor sit amet, consectetur adipisicing..

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x) PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

User wants to securely (irrecoverably) delete PDF content ⇒ Needs to find all source files and their versions ⇒ Potential information leakage against coercive attacker

Assisted Deletion of Related Content December 11, 2014 2

slide-9
SLIDE 9

Introduction

E: PDF D: Gray Image C: Original Image A: Original T ext B: Modified T ext

Loram ipsam dolor sit amit, consectetur adipisicing.. Lorem ipsum dolor sit amet, consectetur adipisicing..

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x) PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

User wants to securely (irrecoverably) delete PDF content ⇒ Needs to find all source files and their versions ⇒ Potential information leakage against coercive attacker ⇒ Secure deletion for project-related content

Assisted Deletion of Related Content December 11, 2014 2

slide-10
SLIDE 10

Problem & Related Work

User wants to securely delete project information

User has to specify blocks, files or complete devices [Boneh96,Cachin13,Crescenzo99,Gutmann96,Reardon13] Requires tedious search

Assisted Deletion of Related Content December 11, 2014 3

slide-11
SLIDE 11

Problem & Related Work

User wants to securely delete project information

User has to specify blocks, files or complete devices [Boneh96,Cachin13,Crescenzo99,Gutmann96,Reardon13] Requires tedious search

User wants to find related content

Information flow [Enck10,King05] File Provenance [Karlson11,Shah07] Causality between files [Muniswamy-Reddy09] Application or OS specific, require modification

Assisted Deletion of Related Content December 11, 2014 3

slide-12
SLIDE 12

Goal

How can we help the user?

  • 1. Track file relations generally and transparently

Assisted Deletion of Related Content December 11, 2014 4

slide-13
SLIDE 13

Goal

How can we help the user?

  • 1. Track file relations generally and transparently
  • 2. Upon deletion, display related files

Assisted Deletion of Related Content December 11, 2014 4

slide-14
SLIDE 14

Goal

How can we help the user?

  • 1. Track file relations generally and transparently
  • 2. Upon deletion, display related files

Assisted Deletion of Related Content December 11, 2014 4

slide-15
SLIDE 15

For the user upon deletion

paper.pdf

☑ Delete

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 5

slide-16
SLIDE 16

For the user upon deletion

paper.pdf

☑ Delete

paper.tex

☐ Delete

image.jpg

☐ Delete T ext Overlap Image Overlap

Lorem ipsum dolor sit amet, consectetur adipisicing..

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x) PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 5

slide-17
SLIDE 17

For the user upon deletion

paper.pdf

☑ Delete

paper.tex

☐ Delete

  • rig.jpg

☐ Delete

first.tex

☐ Delete

image.jpg

☐ Delete T ext Overlap Similar T ext Image Overlap Similar Image

Lorem ipsum dolor sit amet, consectetur adipisicing.. Loram ipsam dolor sit amit, consectetur adipisicing..

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x) PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 5

slide-18
SLIDE 18

For the user upon deletion

paper.pdf

☑ Delete

paper.tex

☐ Delete

  • rig.jpg

☐ Delete

first.tex

☐ Delete

image.jpg

☐ Delete

paper.log

☐ Delete T ext Overlap Similar T ext Image Overlap Similar Image Accessed T

  • gether

Lorem ipsum dolor sit amet, consectetur adipisicing.. Loram ipsam dolor sit amit, consectetur adipisicing.. This is pdfT eX, Version ... Document Class: ...

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x) PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 5

slide-19
SLIDE 19

How can we help the user?

  • 1. Track file relations generally and transparently
  • 2. Upon deletion, display related files

Assisted Deletion of Related Content December 11, 2014 6

slide-20
SLIDE 20

How can we help the user?

  • 1. Track file relations generally and transparently
  • 2. Upon deletion, display related files
  • 3. User can leverage existing secure deletion solutions

Assisted Deletion of Related Content December 11, 2014 6

slide-21
SLIDE 21

How can we help the user?

  • 1. Track file relations generally and transparently
  • 2. Upon deletion, display related files
  • 3. User can leverage existing secure deletion solutions

Attacker Model

Non-malicious environment during operation Protect user’s home directory Coercive attacker with complete data access

Assisted Deletion of Related Content December 11, 2014 6

slide-22
SLIDE 22

How can we help the user?

  • 1. Track file relations generally and transparently
  • 2. Upon deletion, display related files
  • 3. User can leverage existing secure deletion solutions

Attacker Model

Non-malicious environment during operation Protect user’s home directory Coercive attacker with complete data access

Assisted Deletion of Related Content December 11, 2014 6

slide-23
SLIDE 23

How is related content accessed?

Preliminary user study: 4 users, different tasks

Lorem ipsum dolor sit amet, consectetur adipisicing..

... ,r(

)

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

,r(

)

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

,w(

), ...

Assisted Deletion of Related Content December 11, 2014 7

slide-24
SLIDE 24

How is related content accessed?

Preliminary user study: 4 users, different tasks

Lorem ipsum dolor sit amet, consectetur adipisicing..

... ,r(

)

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

,r(

)

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

,w(

), ...

Lorem ipsum dolor sit amet, consectetur adipisicing..

... ,r(

)

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

,r(

)

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

,w(

), ...

,r(

)

Icon by Freepik from www.flaticon.com, CC BY 3.0 Assisted Deletion of Related Content December 11, 2014 7

slide-25
SLIDE 25

General Architecture

IRCUS (Identification of Related Content from User Space)

Operating System Storage IRCUS App 2 App 1 App 0 App 3

Assisted Deletion of Related Content December 11, 2014 8

slide-26
SLIDE 26

General Architecture

IRCUS (Identification of Related Content from User Space)

Operating System Storage IRCUS App 2 App 1 App 0 App 3 Request: Read/Write Arguments

Assisted Deletion of Related Content December 11, 2014 8

slide-27
SLIDE 27

General Architecture

IRCUS (Identification of Related Content from User Space)

Operating System Storage IRCUS App 2 App 1 App 0 App 3 Request Copy

Assisted Deletion of Related Content December 11, 2014 8

slide-28
SLIDE 28

General Architecture

IRCUS (Identification of Related Content from User Space)

Operating System Storage IRCUS App 2 App 1 App 0 App 3

Assisted Deletion of Related Content December 11, 2014 8

slide-29
SLIDE 29

General Architecture

IRCUS (Identification of Related Content from User Space)

Operating System Storage IRCUS App 2 App 1 App 0 App 3 Result: Errorcode (Buffer)

Assisted Deletion of Related Content December 11, 2014 8

slide-30
SLIDE 30

General Architecture

IRCUS (Identification of Related Content from User Space)

Operating System Storage IRCUS App 2 App 1 App 0 App 3 Result Copy

Assisted Deletion of Related Content December 11, 2014 8

slide-31
SLIDE 31

General Architecture

IRCUS (Identification of Related Content from User Space)

Operating System Storage IRCUS App 2 App 1 App 0 App 3 User Space Kernel Space

Assisted Deletion of Related Content December 11, 2014 8

slide-32
SLIDE 32

Identification of related content

Common content

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 9

slide-33
SLIDE 33

Identification of related content

Common content

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

4 content types: PDF, Text, JPG, Binary

Assisted Deletion of Related Content December 11, 2014 9

slide-34
SLIDE 34

Identification of related content

Common content

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

4 content types: PDF, Text, JPG, Binary

Assisted Deletion of Related Content December 11, 2014 9

slide-35
SLIDE 35

Content Comparison

Binary:

Find identical blocks [Tridgell99] + filtering

JPG:

Histogram comparison

Text:

Text resemblance [Broder97]

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu At vero eos et accusamus et iusto odio dignissimos ducimus, nisi ut aliquip qui blanditiis praesentium voluptatum deleniti atque corrupti, quos dolores et quas molestias excepturi sint, obcaecati cupiditate non provident, similique sunt in culpa, qui o animi, incididunt ut labore id est laborum et dolorum fuga. Et

PDF:

Unpack PDF , compare images and text

Lorem ipsum dolor sit amet, consectetur adipisicing..

  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x) PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 10

slide-36
SLIDE 36

Identification of related content

Common content

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

Assisted Deletion of Related Content December 11, 2014 11

slide-37
SLIDE 37

Identification of related content

Common content

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

File co-location

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

PDF Image

Assisted Deletion of Related Content December 11, 2014 11

slide-38
SLIDE 38

Identification of related content

Common content

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

File co-location

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

PDF Image

Similar access patterns

,w(

)

PDF-Te s t PDF-Te ste r Lore mipsumdolor sit ame t, conse cte tur adipisicing e lit, se d do e iusmod te mpor incididunt ut labore e t dolore magna aliqua. Ut e nim ad minim ve niam, quis nostrud e xe rcitation ullamco laboris nisi ut aliquip e x e a com- modo conse
  • quat. Duis aute irure dolor in re
pre he nde rit in voluptate ve lit e sse cillum dolore e u fugiat nulla pariatur. Exce pte ur sint occae cat cup- idatat non proide nt, sunt in culpa qui of cia de se runt mollit anim id e st laborum.
  • 1
  • 0.8
  • 0.6
  • 0.4
  • 0.2
0.2 0.4 0.6 0.8 1 2 4 6 8 10 12 Random Plot sin(x) cos(x)

w(

)

This is pdfT eX, Version ... Document

Assisted Deletion of Related Content December 11, 2014 11

slide-39
SLIDE 39

Prototype

Based on FUSE (Filesystem in Userspace):

Operating System Storage FUSE App User Space Kernel Space IRCUS

Assisted Deletion of Related Content December 11, 2014 12

slide-40
SLIDE 40

Prototype

Based on FUSE (Filesystem in Userspace):

Operating System Storage FUSE App IRCUS

Assisted Deletion of Related Content December 11, 2014 12

slide-41
SLIDE 41

Prototype

Based on FUSE (Filesystem in Userspace):

Request & Result Collection Operating System Storage FUSE App

Assisted Deletion of Related Content December 11, 2014 12

slide-42
SLIDE 42

Prototype

Based on FUSE (Filesystem in Userspace):

Request & Result Collection Operating System Storage FUSE App

Assisted Deletion of Related Content December 11, 2014 12

slide-43
SLIDE 43

Prototype

Based on FUSE (Filesystem in Userspace):

Request & Result Collection Operating System Storage FUSE App

Assisted Deletion of Related Content December 11, 2014 12

slide-44
SLIDE 44

Prototype

Based on FUSE (Filesystem in Userspace):

Cache & Comparison Request & Result Collection Operating System Storage FUSE App

Assisted Deletion of Related Content December 11, 2014 12

slide-45
SLIDE 45

Prototype

Based on FUSE (Filesystem in Userspace):

Cache & Comparison Save Relations Request & Result Collection Operating System Storage FUSE App

Assisted Deletion of Related Content December 11, 2014 12

slide-46
SLIDE 46

Prototype

Based on FUSE (Filesystem in Userspace):

Cache & Comparison Save Relations Request & Result Collection Operating System Storage FUSE App

Extended Attributes

Assisted Deletion of Related Content December 11, 2014 12

slide-47
SLIDE 47

Prototype

Based on FUSE (Filesystem in Userspace):

Cache & Comparison Save Relations Request & Result Collection Operating System Storage FUSE App User Space Kernel Space

Assisted Deletion of Related Content December 11, 2014 12

slide-48
SLIDE 48

Storage Throughput Test

10 20 30 40 50 Native FUSE IRCUS

Throughput (MB/s)

Write Files Read Files

Assisted Deletion of Related Content December 11, 2014 13

slide-49
SLIDE 49

Prototype Detection Tests

Results environment-dependent (e.g. user behaviour)

paper.pdf

☑ Delete

Assisted Deletion of Related Content December 11, 2014 14

slide-50
SLIDE 50

Prototype Detection Tests

Results environment-dependent (e.g. user behaviour)

paper.pdf

☑ Delete

image.jpg

☐ Delete

Content Access PID

Assisted Deletion of Related Content December 11, 2014 14

slide-51
SLIDE 51

Prototype Detection Tests

Results environment-dependent (e.g. user behaviour)

paper.pdf

☑ Delete

paper.tex

☐ Delete

image.jpg

☐ Delete

Access

Assisted Deletion of Related Content December 11, 2014 14

slide-52
SLIDE 52

Prototype Detection Tests

Results environment-dependent (e.g. user behaviour)

paper.pdf

☑ Delete

paper.tex

☐ Delete

image.jpg

☐ Delete

paper.bbl

☐ Delete

Content Access PID

Assisted Deletion of Related Content December 11, 2014 14

slide-53
SLIDE 53

Prototype Detection Tests

Results environment-dependent (e.g. user behaviour)

paper.pdf

☑ Delete

paper.tex

☐ Delete

image.jpg

☐ Delete

paper.log

☐ Delete

paper.bbl

☐ Delete

Access PID

Assisted Deletion of Related Content December 11, 2014 14

slide-54
SLIDE 54

Prototype Detection Tests

Results environment-dependent (e.g. user behaviour)

paper.pdf

☑ Delete

paper.tex

☐ Delete

image.jpg

☐ Delete

paper.log

☐ Delete

paper.bbl

☐ Delete

svn.journal

☐ Delete

Access

Assisted Deletion of Related Content December 11, 2014 14

slide-55
SLIDE 55

Prototype Detection Tests

Results environment-dependent (e.g. user behaviour)

paper.pdf

☑ Delete

paper.tex

☐ Delete

image.jpg

☐ Delete

paper.log

☐ Delete

paper.bbl

☐ Delete

svn.journal

☐ Delete

snd.cache

☐ Delete

Access

Assisted Deletion of Related Content December 11, 2014 14

slide-56
SLIDE 56

Prototype Detection Tests

Results environment-dependent (e.g. user behaviour)

paper.pdf

☑ Delete

paper.tex

☐ Delete

image.jpg

☐ Delete

paper.log

☐ Delete

paper.bbl

☐ Delete

svn.journal

☐ Delete

snd.cache

☐ Delete

...

☐ Delete

Assisted Deletion of Related Content December 11, 2014 14

slide-57
SLIDE 57

Prototype Detection Tests

Results environment-dependent (e.g. user behaviour)

paper.pdf

☑ Delete

paper.tex

☐ Delete

image.jpg

☐ Delete

paper.log

☐ Delete

  • rig.jpg

☐ Delete

paper.bbl

☐ Delete

svn.journal

☐ Delete

snd.cache

☐ Delete

...

☐ Delete

Content PID

Assisted Deletion of Related Content December 11, 2014 14

slide-58
SLIDE 58

Conclusions and Future Work

Existing solutions insufficient to prevent data leakage General and usable approach possible Different file types can be linked based on different relations

Assisted Deletion of Related Content December 11, 2014 15

slide-59
SLIDE 59

Conclusions and Future Work

Existing solutions insufficient to prevent data leakage General and usable approach possible Different file types can be linked based on different relations Much more user data needed Adaptation to special user behaviour Usability feedback required

Assisted Deletion of Related Content December 11, 2014 15

slide-60
SLIDE 60

Conclusions and Future Work

Existing solutions insufficient to prevent data leakage General and usable approach possible Different file types can be linked based on different relations Much more user data needed Adaptation to special user behaviour Usability feedback required

Thank you for your attention.

Assisted Deletion of Related Content December 11, 2014 15

slide-61
SLIDE 61

Bibliography I

  • D. Boneh and R. J. Lipton.

A Revocable Backup System. In USENIX Security Symposium, 1996.

  • A. Broder.

On the Resemblance and Containment of Documents. In Proceedings of the Compression and Complexity of Sequences 1997, SEQUENCES ’97. IEEE Computer Society, 1997.

  • C. Cachin, K. Haralambiev, H.-C. Hsiao, and A. Sorniotti.

Policy-based Secure Deletion. CCS ’13. ACM, 2013.

Assisted Deletion of Related Content December 11, 2014 16

slide-62
SLIDE 62

Bibliography II

  • G. D. Crescenzo, N. Ferguson, R. Impagliazzo, and
  • M. Jakobsson.

How to Forget a Secret. In STACS, Lecture Notes in Computer Science. Springer, 1999.

  • W. Enck, P

. Gilbert, B.-G. Chun, L. P . Cox, J. Jung, P . McDaniel, and A. N. Sheth. TaintDroid: An Information-flow Tracking System for Realtime Privacy Monitoring on Smartphones. OSDI’10. USENIX Association, 2010.

Assisted Deletion of Related Content December 11, 2014 17

slide-63
SLIDE 63

Bibliography III

P . Gutmann. Secure Deletion of Data from Magnetic and Solid-State Memory. In USENIX Security Symposium, 1996.

  • A. K. Karlson, G. Smith, and B. Lee.

Which Version is This?: Improving the Desktop Experience Within a Copy-aware Computing Ecosystem. CHI ’11. ACM, 2011.

  • S. T. King and P

. M. Chen. Backtracking Intrusions. ACM Trans. Comput. Syst., 23(1), Feb. 2005.

Assisted Deletion of Related Content December 11, 2014 18

slide-64
SLIDE 64

Bibliography IV

K.-K. Muniswamy-Reddy and D. A. Holland. Causality-based Versioning.

  • Trans. Storage, 5(4), Dec. 2009.
  • J. Reardon, H. Ritzdorf, D. Basin, and S. Capkun.

Secure Data Deletion from Persistent Media. CCS ’13. ACM, 2013.

  • S. Shah, C. A. N. Soules, G. R. Ganger, and B. D. Noble.

Using Provenance to Aid in Personal File Search. ATC’07. USENIX Association, 2007.

Assisted Deletion of Related Content December 11, 2014 19

slide-65
SLIDE 65

Bibliography V

  • A. Tridgell.

Efficient Algorithms for Sorting and Synchronization. PhD thesis, The Australian National University, February 1999.

Assisted Deletion of Related Content December 11, 2014 20