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Output of f 4 = IK, the 128-bit integrity key. Output of f 5 = AK, the 48-bit anonymity key. Output of f 5* = AK, the 48-bit anonymity key. AK is the name of the output of either f 5 or f 5*; in practice these two functions will not be computed simultaneously. 3, the input value OPC is calculated as OPC = OP ⊕ E [OP ] K . 3 MILENAGE block diagram. 206. 2 GPP Encryption and Integrity Functions MILENAGE allows the operator and user to share an encryption key CK, which will be used with the confidentiality algorithm f 8, and an integrity key IK, which will be used with the integrity algorithm f 9.
Working variables are set as A = 0, B = 0, and the key modifier KM is set to the constant value 0xAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA. A padded string (PS), an integral multiple 64 bits long, is obtained by concatenating COUNT, FRESH, MESSAGE, and DIRECTION, and a 1 0* padding, where 0* indicates between 0 and 63 0 bits. COUNT is a time-dependant variable, FRESH is a fresh random number, DIRECTION indicates uplink or downlink transmission, and MESSAGE is the data on which the integrity function must be calculated.
The 64-bit register A = COUNT || BEARER || DIRECTION || 0…0 is set according to initialization vectors COUNT, a time-dependant variable; BEARER, the bearer identity; and DIRECTION, indicating uplink or downlink transmission. Cryptographic Techniques 33 The counter BLKCNT and the first keystream block KSB0 are set to zero, while the key modifier KM is set to the constant value 0x55555555555555555555555555555555. 20) Once the initialization is completed, encryption/decryption operations in 3GPP are identical and are performed by the exclusive-OR of the input data with the generated keystream (KS).
