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Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. Diffie-Hellman groups determine the length of the base prime numbers that are used during the key exchange.
The strength of any key derived depends in part on the strength of the Diffie-Hellman group on which the prime numbers are based. Group 2 medium is stronger than Group 1 low. Group 1 provides bits of keying material, and Group 2 provides 1, bits. If mismatched groups are specified on each peer, negotiation does not succeed.
You cannot switch the group during the negotiation. Encapsulating Security Payload ESP provides confidentiality, authentication, integrity, and anti-replay.
ESP does not ordinarily sign the whole packet unless the packet is being tunneled. Ordinarily, only the data is protected, not the IP header. ESP does not provide integrity for the IP header addressing.
Authentication Header AH provides authentication, integrity, and anti-replay for the whole packet both the IP header and the data carried in the packet. AH signs the whole packet. It does not encrypt the data, so it does not provide confidentiality. You can read the data, but you cannot modify it. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info. Table of contents Exit focus mode. Table of contents. In this article.
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