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Title : Request Header Integrity in SIP and HTTP Digest using
Predictive Nonces
Author(s) : J. Rosenberg
Filename : draft-rosenberg-sip-http-pnonce-00.txt
Pages : 7
Date : 18-Jun-01
The HTTP Digest algorithm, specified in RFC 2617, allows for
authentication of a request, along with integrity checks over the
method, request URI, and optionally, the body. HTTP Digest is the
primary client authentication mechanism used by SIP. However, Digest
does not provide for integrity checks over several key SIP headers,
including the To, From, Call-ID and Contact headers. We define a
mechanism for supporting integrity over these headers, using a new
algorithm we call predictive nonces. The mechanism requires no
changes in clients, and no protocol changes. It requires only a
change in the way the nonce is computed by servers.
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