Nikos Mavrogiannopoulos n.mavrogiannopoulos@gmail.com writes:
As it stands now serpent is an academic cipher, it is not used in any protocol.
It's specified as an optional algorithm in the ssh protocol (see RFC 4253 and RFC 4344).
That said, I think the main use for serpent or any other of the losing aes finalists are as backups in case some serious problem is discovered with aes.
Regards, /Niels