On both StackOverflow and at the healthy beta Cryptography we get a lot of questions about decryption of a certain ciphertext. Sometimes they are just base 64 blocks, but often there is a bit more to it than that. On neither site they are on topic.
Do you allow such questions or are they considered off topic? If they are on-topic, what would be the minimal requirements for said questions? Note that there would be quite a few persons that have a ciphertext because of a hack or because they just want to decrypt a random binary.
Strictly optional question: If they are off topic, would you know a place where they could be posted instead?
Anyway, good luck with the beta!