Cryptographically Generated Address

A Cryptographically Generated Address (CGA) is an Internet Protocol Version 6 (IPv6) address that has a host identifier computed from a cryptographic one-way hash function. This procedure is a method for binding a public signature key to an IPv6 address in the Secure Neighbor Discovery Protocol (SEND).

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Cryptographically Generated Address - Methodology
... A Cryptographically Generated Address is formed by replacing the least-significant 64 bits of the 128-bit IPv6 address with the cryptographic hash of the public key of the address owner ... Only if the source address and the public key are known can the verifier authenticate the message from that corresponding sender ... Valid CGAs may be generated by any sender, including a potential attacker, but they cannot use any existing CGAs ...

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