Wei Dai said;
> For generating license codes, you probably want to use a signature > scheme rather than an encryptions scheme. There is a signature scheme > (Quartz) that has generates small signatures, but it hasn't been > implemented in Crypto++ yet. DSA and ECDSA have the smallest signatures > in Crypto++, around 320 bits. Is this a function of using SHA-1 as the hash? What would be the overall effect of doing a CRC-32 on the hash? Intuitively, that would produce an 8-byte signature, and collision resistance would go out the window. Is it possible? How bad would it be? Obviously, I know practiacally zero about cryptology, and wouldn't try that in my stuff, but it's an interesting question (to me). Thanks for your time, and all the support to me and many others in your responses to this list, Rick
