The operator network then sends the RAND to the mobile equipment, which passes it to the SIM card.The operator network then generates a random number (RAND, which is a nonce) and signs it with the K i associated with the IMSI (and stored on the SIM card), computing another number, that is split into the Signed Response 1 (SRES_1, 32 bits) and the encryption key K c (64 bits).The operator network searches its database for the incoming IMSI and its associated K i.The mobile equipment may have to pass a PIN to the SIM card before the SIM card reveals this information. When the mobile equipment starts up, it obtains the international mobile subscriber identity (IMSI) from the SIM card, and passes this to the mobile operator, requesting access and authentication.
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