Tim Hudson <t...@cryptsoft.com> writes: >Does anyone recollect the history behind and the implications of the (open) >SSH choice of 35 as a hard-wired public exponent?
/* OpenSSH versions up to 5.4 (released in 2010) hardcoded e = 35, which is both a suboptimal exponent (it's less efficient that a safer value like 257 or F4) and non-prime. The reason for this was that the original SSH used an e relatively prime to (p-1)(q-1), choosing odd (in both senses of the word) numbers > 31. 33 or 35 probably ended up being chosen frequently so it was hardcoded into OpenSSH for cargo-cult reasons, finally being fixed after more than a decade to use F4. In order to use pre-5.4 OpenSSH keys that use this odd value we make a special-case exception for SSH use */ Peter. _______________________________________________ The cryptography mailing list email@example.com http://www.metzdowd.com/mailman/listinfo/cryptography