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Microsoft Point-to-Point Encryption

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MPPE stands for Microsoft Point-to-Point Encryption and is described in RFC 3078 It is a protocol for encrypting data across Point-to-Point Protocol (PPP) and Virtual Private Network (VPN) links. It uses the RSA RC4 encryption algorithm. MPPE currently supports 48-bit and 128-bit session keys, which are changed frequently to improve security. The exact frequency that the keys are changed is negotiated, but may be as frequent as every packet.

MPPE alone does not compress or expand data, but the protocol is often used in conjunction with MPPC which compresses data across PPP or VPN links.

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