Systems and methods are provided for using a registry to assure parties receiving a communication, such as an incoming phone call, that the party sending the communication, such as the caller is, who it appears to be. In some embodiments the registry is a publicly accessible database which stores communication identifiers such as telephone numbers for parties in association with other data including data provided by the parties or others. The other data may include the name of the party associated with the identifier, a cryptographic public key used by the party as part of a public/private key pair, data representing the intent of the party in sending a communication, and parameters set by parties to be satisfied to receive communications or in determining how such communications should be handled. The system may provide the data representing the party's specific intention in that call or other communication to the party receiving the communication.