Ah, the intention is to produce something rather more general-purpose than that, which I can point at an arbitrary public key block.

I notice that my colleague (who's using PGP Freeware 7.0.3 for Mac) can select any of his imported keys and get information about ID, Type, Keysize, Creation date, Expiry date and Cipher; amongst the keys he has imported are ones specifying CAST, AES-256, AES-128 or IDEA as the cipher.

If it comes to it, I can always ask users to select a cipher from a list of those available, but I'm hoping to be able to provide the same auto-detect support that PGP Freeware is doing.

Hugo