> So to clarify: If I generate a 65-bit key, will I be able to use that > 65-bit key to sign any 64-bit value?
Yes, however, a 65-bit RSA key can be broken with relative ease. You could solve your three most obvious problems by using a 384-bit RSA key and using it to sign the full SHA1 hash. DS ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]