Key agreement using a key derivation key

摘要

Methods, systems, and computer programs for performing key agreement operations in a communication system are described. In some aspects, a wireless network operator accesses a secret key associated with a mobile device. A key derivation function (KDF) is evaluated based on the secret key to produce a key derivation key, and the KDF is evaluated based on the key derivation key to produce an output value. A session key and a challenge value are obtained based on the output value. In some aspects, the mobile device receives the challenge value and accesses a secret key. A KDF is evaluated based on the secret key to produce a key derivation key, and the KDF is evaluated based on the key derivation key to produce an output value. A response value and a session key are obtained based on the output value. The response value is transmitted to the wireless network operator.

主权项

1. A method performed on a server in a network, the method comprising:
receiving an identifier associated with a mobile device; accessing, based on the identifier, a secret key associated with the mobile device; evaluating a key derivation function to produce a key derivation key based on the secret key, wherein the key derivation function is based on a hash function; evaluating the key derivation function to produce an output value based on the key derivation key; and obtaining a session key based on the output value.