Cryptography
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Jon Callas

Cryptographer. Co-author of OpenPGP, DKIM, syslog-sign, ZRTP, the Skein hash function, Threefish cipher, and other things.

Businessman. Co-founder of PGP Corporation, Silent Circle, World Benders, and others. Presently CTO at Entrust.

Software engineer. Worked at the above as well as Apple, DEC, NASA, and others.

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  • Member for 7 years, 9 months
  • 151 profile views
  • Last seen Feb 8 at 3:13

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Top posts (40) All Questions Answers | Votes Newest

17 Has threefish successfully been attacked (practically or theoretically)? Nov 19 '13
12 How to build an electro-mechanical public key cipher machine? Jun 19 '13
12 Could the Enigma algorithm be classified as a Feistel network? Oct 2 '12
11 How do public key rings work in cryptographic applications? Mar 6 '12
9 What is the largest performed/possible bruteforce attack to date? Apr 11 '12
9 Is every output of a hash function possible? May 29 '12
9 Purpose of outer key in HMAC Jul 31 '12
7 How does one verify a GPG/PGP key revocation? Jun 19 '12
7 How to authenticate over open channel? Mar 28 '12
6 Predicting values from a Linear Congruential Generator Mar 14 '12
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