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Good/Bad Crypto (cont.) & Bitcoin

This announcement highlights the use of Signal Authenticated Diffie-Hellman with Deniability for secure and private messaging. It covers the process of exchanging encrypted messages and computing cryptographic keys. It also addresses the weaknesses of PGP, openssl.libcrypto, and libssl, and discusses real-world examples of crypto failures such as Two-Time Pad and VENONA Pad Reuse. Additionally, it mentions the vulnerabilities of KRACK attack, GCM, DSA Signatures, Sony Playstation 3 DRM, and Android RNG Bug in relation to Bitcoin.

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Good/Bad Crypto (cont.) & Bitcoin

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Presentation Transcript

  1. Good/Bad Crypto (cont.)& Bitcoin

  2. Announcements!

  3. Exercise:Send me an encrypted message

  4. Signal Authenticated Diffie-Hellman with Deniability

  5. Signal Authenticated Diffie-Hellman with Deniability Alice sends gA and ga Bob sends gB and gb

  6. Signal Authenticated Diffie-Hellman with Deniability Both compute KDF(gAb, gaB, gab)

  7. SHA3 (Keccak) Cryptographic Sponge Construction

  8. Unusability:PGP

  9. Unusability:How do you find someone's PGP key?

  10. Unusability:openssl libcrypto and libssl

  11. An Old Cryptofail:Too Short Keys

  12. Another Cryptofail:Two-Time Pad

  13. VENONA:Pad Reuse in the Real World

  14. 2-Time Pad CryptofailRemarkably Common

  15. Cryptofail Hotness:KRACK attack...

  16. GCM...

  17. DSA Signatures...

  18. Alice's Signature...

  19. But Easy To Screw Up...

  20. And NOT theoretical:Sony Playstation 3 DRM

  21. And NOT Theoretical:Android RNG Bug + Bitcoin

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