OSEC

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Subject: Re: A proposal for secure videoconferencing and video messaging over the Internet
From: David A. Wagner (dawCS.Berkeley.EDU)
Date: Wed Jul 26 2000 - 19:46:00 CDT

Eugene Leitl <eugene.leitllrz.uni-muenchen.de> wrote:
> To best of my knowledge, authentication can be currently
> only conducted with one-time pads (too inconvenient for large groups
> of people) or public key cryptography [...]

No, that's not correct. There are symmetric-key authentication primitives,
commonly known as message authentication codes (MAC's), just like there are
symmetric-key encryption ciphers. One example of a widely-respected MAC is
SHA1-HMAC.