Patent ID: 8259942

Claim:
A non-transitory computer-readable medium having instructions stored thereon, the instructions comprising: instructions to calculate, at a wireless terminal, a first ciphering key using a secret key stored in a subscriber identity module of the wireless terminal and a challenge code associated with the secret key and sent by a mobile network and transferred via a wireless local area network to the wireless terminal; instructions to calculate, in the wireless terminal, a second ciphering key using the first ciphering key; instructions to transmit, from the wireless terminal, an authentication request message to the mobile network, wherein the authentication request message includes the second ciphering key; and instructions to, in response to successful authentication of the wireless terminal, decipher, in the wireless terminal, the data between the wireless terminal and an access point of the wireless local area network using the second ciphering key, wherein the subscriber identity module is configured to support a GSM system, the wireless local area network is configured to support an IEEE 802.11 standard, and the mobile network is configured to support the GSM standard.