High Quality Content by WIKIPEDIA articles! In computing, the Challenge-Handshake Authentication Protocol (CHAP) authenticates a user or network host to an authenticating entity. That entity may be, for example, an Internet service provider. CHAP provides protection against playback attack by the peer through the use of an incrementally changing identifier and of a variable challenge-value. CHAP requires that both the client and server know the plaintext of the secret, although it is never sent over the network. Microsoft has implemented a variant of the Challenge-handshake authentication protocol, called MS-CHAP, which does not require either peer to know the plaintext.

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