It is, but ... I'm at problem 44 or so in Euler[0] and only solved the first set of Cryptopals. But I'm just going to add here:

Matasano Cryptopals challenges is amazing, back off

;-)

[0] Honestly ... Say 'pandigital prime' again, I dare you, I double dare you motherfucker, say 'pandigital prime' one more goddamn time! Ahem