uChallenge Handshake Authentication Protocol (CHAP): An encrypted handshake protocol designed for standard IP- or PPP-based exchange of passwords. It provides a reasonably secure, standard, cross-platform method for sender and receiver to negotiate a connection.
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uCHAP with Microsoft extensions (MS-CHAP): A Microsoft-enhanced version of CHAP that can negotiate encryption levels and that uses the highly secure RSA RC4 encryption algorithm to encrypt communications between client and host
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