17 Dec
2003
17 Dec
'03
11:17 p.m.
It is an interesting idea that the RSA actually helps with the RC4 decryption by letting them check a key guess. This would suggest, though, that RC4 alone would not be allowed, only RC4 plus RSA. If they allowed RC4 alone then unlimited-length RSA would not seem any worse since with RC4 alone you don't get the key-checking feature. Also, are there restrictions on the encryption exponent? A 1024 bit RSA with a small encryption exponent would be faster to check than a 512 bit RSA with an arbitrary 512 bit encryption exponent. So if this were the reason you might think they would put some restrictions on that. Hal