Cryptography
Jon Callas's user avatar
Jon Callas's user avatar
Jon Callas's user avatar
Jon Callas
  • Member for 11 years, 7 months
  • Last seen more than 2 years ago
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About

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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All Questions Answers
Score Newest
answer
18
Has threefish successfully been attacked (practically or theoretically)?
Nov 19, 2013
answer
13
How to build an electro-mechanical public key cipher machine?
Jun 19, 2013
answer
12
Could the Enigma algorithm be classified as a Feistel network?
Oct 2, 2012
answer
12
How do public key rings work in cryptographic applications?
Mar 6, 2012
answer
10
What is the largest performed/possible bruteforce attack to date?
Apr 11, 2012
answer
10
Is every output of a hash function possible?
May 29, 2012
answer
10
Purpose of outer key in HMAC
Jul 31, 2012
answer
8
How does one verify a GPG/PGP key revocation?
Jun 19, 2012
answer
7
How to authenticate over open channel?
Mar 28, 2012
answer
7
Is the HMAC construction really neccessary for a fixed length message?
May 19, 2015

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