Authenticated Encryption (AE) Instructor: Ahmad Boorghany
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1 Sharif University of Technology Department of Computer Engineering Data and Network Security Lab Authenticated Encryption (AE) Instructor: Ahmad Boorghany Most of the slides are obtained from Bellare and Rogaway s Introduction to Modern Cryptography course. 1 / 41
2 Outline Motivation Generic Composition Authenticated Encryption with Associated Data (AEAD) 2 / 41
3 Motivation 3 / 41
4 Authenticated Encryption 4 / 41
5 Authenticated Encryption Schemes 5 / 41
6 Privacy of Authenticated Encryption Schemes 6 / 41
7 Integrity of Authenticated Encryption Schemes 7 / 41
8 INT-CTXT 8 / 41
9 Integrity with privacy 9 / 41
10 Relations 10 / 41
11 Plain Encryption Does Not Provide Integrity 11 / 41
12 Encryption with Redundancy 12 / 41
13 Encryption with Redundancy Fails 13 / 41
14 WEP Attack 14 / 41
15 Generic Composition 15 / 41
16 Generic Composition 16 / 41
17 Generic Composition Methods 17 / 41
18 Encrypt-and-MAC 18 / 41
19 Encrypt-and-MAC 19 / 41
20 Encrypt-and-MAC 20 / 41
21 Encrypt-and-MAC 21 / 41
22 MAC-then-Encrypt 22 / 41
23 MAC-then-Encrypt 23 / 41
24 MAC-then-Encrypt 24 / 41
25 MAC-then-Encrypt 25 / 41
26 Encrypt-then-MAC 26 / 41
27 Encrypt-then-MAC 27 / 41
28 Encrypt-then-MAC 28 / 41
29 Encrypt-then-MAC 29 / 41
30 Achieving IND-CCA 30 / 41
31 Two keys or one? 31 / 41
32 Generic Composition in Practice 32 / 41
33 AE in SSH 33 / 41
34 AE in SSL 34 / 41
35 Authenticated Encryption with Associated Data (AEAD) 35 / 41
36 AEAD 36 / 41
37 AEAD Privacy 37 / 41
38 AEAD Integrity 38 / 41
39 AEAD Schemes 39 / 41
40 Performance Comparisons x32 40 / 41
41 Questions? 41 / 41
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