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IPsec (Internet Protocol Security)

A set of protocols developed by the IETF to support secure exchange of packets at the IP layer.

IPsec Algorithms And Keys

Currently IPsec is mainly described by the three following RFCs:

The Algorithms to use and their requirements are described in [http://www.ietf.org/rfc/rfc4305.txt RFC 4305]: Cryptographic Algorithm Implementation Requirements for Encapsulating Security Payload (ESP) and Authentication Header (AH), D. Eastlake 3rd, December 2005, PROPOSED STANDARD.

You also may use some other Cryptographic Algorithms (have a look at the IANA for some other examples).

Ethereal

If lnked with Libcrypt Ethereal can decrypt IPsec ESP payload see ["ESP_Preferences"]