YAK (cryptography)

The YAK is a public-key authenticated . It is considered the simplest among the related protocols, including MQV, HMQV, , SSL/TLS etc. The authentication is based on public key pairs. As with other protocols, YAK normally requires a Public Key Infrastructure to distribute authentic public keys to the communicating parties. The author suggests that YAK may be unencumbered by patent.

Two parties, Alice and Bob, agree on a group ${\displaystyle G}$ with generator ${\displaystyle g}$ of prime order ${\displaystyle q}$ in which the discrete log problem is hard. Typically a Schnorr group is used. In general, YAK can use any prime order group that is suitable for public key cryptography, including elliptic curve cryptography. Let ${\displaystyle g^{a}}$ be Alice's long-term public key and ${\displaystyle g^{b}}$ be Bob's. The protocol executes in one round:

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