Efail - Breaking S-MIME and OpenPGP Email Encryption Using Exfiltration Channels

Efail - Breaking S-MIME and OpenPGP Email Encryption Using Exfiltration Channels

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RFC4880 on Modification Detection Codes

16 of 21

16 of 21

RFC4880 on Modification Detection Codes

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Classroom Contents

Efail - Breaking S-MIME and OpenPGP Email Encryption Using Exfiltration Channels

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  1. 1 Intro
  2. 2 History of secure email
  3. 3 Two competing standards
  4. 4 Motivation for using end-to-end encryption
  5. 5 Both standards use old crypto
  6. 6 Old crypto has no negative impact
  7. 7 Backchannel techniques
  8. 8 Evaluation of backchannels in email clients
  9. 9 Attacker model
  10. 10 Hybrid encryption
  11. 11 Hybrid malleability of CBC/CFG
  12. 12 Malleability of CBC/CFB
  13. 13 Overview
  14. 14 Practical Attack against S/MIME
  15. 15 OpenPGP - Integrity Protection
  16. 16 RFC4880 on Modification Detection Codes
  17. 17 OpenPGP - Compression (DEFLATE)
  18. 18 Impact on the standards
  19. 19 Direct exfiltration - Demo Time
  20. 20 Conclusions
  21. 21 Black Hat sound bytes

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