Replay, Relay and Inverse-Sybil Attacks on Proximity Tracing Apps - - PowerPoint PPT Presentation

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Replay, Relay and Inverse-Sybil Attacks on Proximity Tracing Apps - - PowerPoint PPT Presentation

Jul 24, 2023 33 likes •225 views

Replay, Relay and Inverse-Sybil Attacks on Proximity Tracing Apps Krzysztof Pietrzak 2020 Eurocrypt Rump Session, May 13th, Living Room Proximity Tracing . . . 8GD45AF3 8GD45AF3 . . . 8GD45AF3 Proximity Tracing . . . 8GD45AF3 8GD45AF3

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SLIDE 1

Replay, Relay and Inverse-Sybil Attacks

  • n Proximity Tracing Apps

2020 Eurocrypt Rump Session, May 13th, Living Room

Krzysztof Pietrzak

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SLIDE 2

Proximity Tracing

8GD45AF3 8GD45AF3 8GD45AF3 . . . . . .

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SLIDE 3

Proximity Tracing

8GD45AF3 8GD45AF3 8GD45AF3 . . . . . . . . . 8GD45AF3 . . . . . . 8GD45AF3 . . . . . .

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SLIDE 4

Proximity Tracing

8GD45AF3 8GD45AF3 8GD45AF3 . . . . . . . . . 8GD45AF3 . . . . . . 8GD45AF3

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SLIDE 5

Replay and Relay Attacks

8GD45AF3 8GD45AF3 8GD45AF3 . . . . . . . . .

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SLIDE 6

Replay and Relay Attacks

8GD45AF3 8GD45AF3 8GD45AF3 . . . . . . . . . 8GD45AF3

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SLIDE 7

Replay and Relay Attacks

8GD45AF3 8GD45AF3 8GD45AF3 . . . . . . . . . 8GD45AF3 8GD45AF3

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SLIDE 8

Replay and Relay Attacks

8GD45AF3 8GD45AF3 8GD45AF3 . . . . . . . . . 8GD45AF3 8GD45AF3

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SLIDE 9

Preventing Relay and Replay Attacks without Privacy

ID, K C tag = MACK(C) ID ID, tag, C

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SLIDE 10

Preventing Relay and Replay Attacks without Privacy

ID, K C tag = MACK(C) ID ID, tag, C ID, K ID, K

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SLIDE 11

Preventing Relay and Replay Attacks without Privacy

ID, K C tag = MACK(C) ID ID, tag, C ID, K ID, K tag

?

= MACK(C) ID, tag, C

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SLIDE 12

Preventing Relay and Replay Attacks without Privacy

ID, K C tag = MACK(C) ID ID, tag, C ID, K ID, K tag

?

= MACK(C) ID, tag, C

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SLIDE 13

Preventing Relay and Replay Attacks without Privacy

ID, K C tag = MACK(C) ID ID, tag, C ID, K ID, K tag

?

= MACK(C) ID, tag, C

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SLIDE 14

Delayed Authentication (eprint 2020/418)

tag = MACK(σ) ID, R σ := commit(C; R) ID, tag, σ ID, K σ := commit(C; R)

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SLIDE 15

Delayed Authentication (eprint 2020/418)

tag = MACK(σ) ID, R σ := commit(C; R) ID, tag, σ ID, K ID, K ID, K tag

?

= MACK(σ) ID, tag, σ σ := commit(C; R)

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SLIDE 16

Delayed Authentication (eprint 2020/418)

tag = MACK(σ) ID, R σ := commit(C; R) ID, tag, σ ID, K ID, K ID, K tag

?

= MACK(σ) ID, tag, σ σ := commit(C; R)

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SLIDE 17

Inverse Sybil Attacks

8GD45AF3 8GD45AF3 8GD45AF3

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SLIDE 18

Inverse Sybil Attacks

8GD45AF3 8GD45AF3 8GD45AF3

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SLIDE 19

Inverse Sybil Attacks

8GD45AF3 8GD45AF3 8GD45AF3

https://github.com/DP-3T/documents/issues/295