New block Cipher Anatoly Lebedev; Andrey Karondeev; Alexandre Kozlov - - PowerPoint PPT Presentation

▶
new block cipher
SMART_READER_LITE
LIVE PREVIEW

New block Cipher Anatoly Lebedev; Andrey Karondeev; Alexandre Kozlov - - PowerPoint PPT Presentation

May 09, 2023 452 likes •562 views

Rump Session 2016 New block Cipher Anatoly Lebedev; Andrey Karondeev; Alexandre Kozlov BMSTU 1 John Nash to NSA In 1950-es mathematician and Nobel Prize winner John Nash wrote several letters to NSA offering some new ideas of

slide-1
SLIDE 1

Rump Session 2016

New block Cipher

Anatoly Lebedev; Andrey Karondeev; Alexandre Kozlov

BMSTU

slide-2
SLIDE 2

John Nash to NSA

In 1950-es mathematician and Nobel Prize winner John Nash wrote several letters to NSA

  • ffering some new ideas of

„enciphering algorithms“.

1

slide-3
SLIDE 3
  • 2001. NESSIE

LAN Crypto Ltd. offered a block cipher called NUSH. The NUSH cipher later was found not secure with respect to linear cryptanalysis.

2

slide-4
SLIDE 4

Change NUSH to NASH

Make round function key-dependent. We make round transformations dependent of an intermediate information block and a key.

3

slide-5
SLIDE 5

Implementation

Variable cyclic rotation. Cyclic rotations dependent of an information block and a key.

4

slide-6
SLIDE 6

Round Function

5

slide-7
SLIDE 7

Basic Formulas

Addition of a key with an information semiblock (mod 2n ) makes cycle variation function nonlinear:

6

slide-8
SLIDE 8

Variable Cyclic Rotation

7

Rotations : 11, 14, 10, or 19 for the 64 bit block. Rotations: 37, 34, 38, or 29 for the 128 bit block.

slide-9
SLIDE 9

Key Schedule

8

slide-10
SLIDE 10

Thank you!

Authors: Anatoly Lebedev, Andrey Karondeev, Alexander Kozlov. Bauman Moscow State University (RUSSIA) For requests: lan@lancrypto.com

9