ZRTP (Zimmermann Real-time Transport Protocol) is a cryptographic key-agreement protocol that allows two parties to establish a secure communication channel over an otherwise insecure network. It is designed to be easy to use and implement, and it is specifically designed for use with VoIP (Voice over Internet Protocol) applications, such as Skype and Google Talk.

ZRTP uses a combination of public key and symmetric key encryption to establish a secure communication channel. It is designed to be used in conjunction with other protocols, such as SIP (Session Initiation Protocol), which is used to establish and control the actual VoIP call.

One of the key features of ZRTP is its ability to perform a "short authentication string" (SAS) exchange between the two parties, which allows them to visually confirm that the secure communication channel has been established. This can be especially useful in situations where the parties may be unable to verify the security of the channel through other means, such as when communicating over a public network or through a third-party service.

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