Putty windows portable keygen#

Putty windows portable keygen#

However, the most modern factoring algorithms are unaffected, so this option is probably not worth turning on unless you have a local standard that recommends it. A ‘strong’ prime is a prime number chosen to have a particular structure that makes certain factoring algorithms more difficult to apply, so some security standards recommend their use. You might choose to switch from probable to proven primes if you have a local security standard that demands it, or if you don’t trust the probabilistic argument for the safety of the usual method.įor RSA keys, there’s also an option on the Key menu to use ‘strong’ primes as the prime factors of the public key. (This is only a concern for RSA keys for other key types, primes are either not secret or not involved.) If you use PuTTYgen to generate an RSA key on a computer that is potentially susceptible to timing- or cache-based side-channel attacks, such as a shared computer, the probable primes method is designed to resist such attacks, whereas the proven primes methods are not. There in one way in which PuTTYgen’s proven primes method is not strictly better than its probable primes method. This takes more effort, but it eliminates that theoretical risk in the probabilistic method.

The other methods cause PuTTYgen to use numbers that it is sure are prime, because it generates the output number together with a proof of its primality.