Jon Callas

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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.


34 Answers

newest activity votes
3
How to build an electro-mechanical public key cipher machine?
15h ago
-2
Are there any standards of multi-prime RSA key generation?
dec 12 at 2:56
1
Can I use PGP to sign a message without providing cryptographic non-repudation?
dec 12 at 1:28
0
Is an RSA variant with public exponent $e=f+(p-1)\cdot(q-1)$ safe (for $f$ random in some small interval)?
oct 30 at 18:32
2
Can ElGamal encryption and ElGamal signatures be used together sharing the same key-pairs?
oct 30 at 18:14
0
What's the fundamental difference between Diffie-Hellman and RSA?
oct 2 at 19:38
3
Could the Enigma algorithm be classified as a Feistel network?
oct 2 at 18:59
0
When is each key used when encrypting an email using OpenPGP?
oct 2 at 18:56
1
Which is more secure using a CSPRNG for a One-time pad, or AES?
sep 25 at 18:53
2
Purpose of outer key in HMAC
jul 31 at 22:58
4
Purpose of outer key in HMAC
jul 31 at 22:17
2
RC4 Keylength Limits
jul 10 '12 at 20:14
3
two public keys with same passphrase insecure? | can two hashes be compared?
jun 19 '12 at 21:40
2
Is compressing data prior to encryption necessary to reduce plaintext redundancy?
jun 19 '12 at 21:37
2
Is the “Signed on date” of a PGP Signature Verified?
jun 19 '12 at 21:29
2
How exactly are GPG keys mathematically related, and prime numbers inside of GPG general
jun 19 '12 at 21:21
2
GPG/PGP Verification of Revocation
jun 19 '12 at 21:07
1
OpenPGP Public-Key Encrypted Session Key Packet Key ID generation
jun 19 '12 at 21:06
5
Is every output of a hash function possible?
may 29 '12 at 20:54
1
Attacks of the MAC construction $\mathcal{H}(m||k)$ for common hashes $\mathcal{H}$?
may 29 '12 at 19:56
2
Which MACs can be converted into a secure unkeyed hash function?
may 29 '12 at 19:46
1
RSA with small exponents?
may 15 '12 at 18:51
2
Difficulty of breaking RSA for a given key size
may 15 '12 at 18:46
6
What is the largest performed/possible bruteforce attack to date?
apr 11 '12 at 0:06
2
Can you make a hash out of a stream cipher?
apr 3 '12 at 20:17
5
How to authenticate over open channel?
mar 28 '12 at 7:17
2
Unit testing a library RNG and its seeding for practical security
mar 28 '12 at 6:36
4
Can PBKDF2 be used to create an OTP to encrypt random plaintext?
mar 14 '12 at 4:31
3
Does a public key absolutely need to be used to initiate an encrypted session?
mar 14 '12 at 4:13
3
CBC - a canonical mode, even though there are streaming modes
mar 14 '12 at 3:55
1 2