1. A method for attacking encrypted GSM communications, said method comprising: using a first wireless transceiver to impersonate a GSM cellular network before a wireless client device; using the first wireless transceiver to receive, from the wireless client device, an encrypted first GSM communication, which first GSM communication is intended for the GSM cellular network; using first processing circuitry to recover an encryption key used by the wireless client device to encrypt the first GSM communication; using a second wireless transceiver to impersonate the wireless client device before the GSM cellular network, using the recovered encryption key;