By Selim Aissi
With viruses, spy ware, and a possible never-ending onslaught of recent cyber-threats, safeguard is a vital and relentless quandary for all networking execs. this is often very true for cellular networking pros, who're all too conscious of cellular technology's particular vulnerability. This critical reference turns cellular community builders, architects, and engineers into cellular safety experts. overlaying each one kind of cellular know-how from WiFi to Bluetooth, the ebook information each one technology's safety weaknesses and gives finished countermeasures to thwart threats. It explains in language geared for networking pros the necessities of the newest safeguard criteria and protocols. most significantly, the ebook pinpoints protection matters encountered end-to-end all through a complete cellular community. The book's whole catalog of defense vulnerabilities guarantees that every one conceivable security features are taken. a pragmatic, hands-on dialogue of promising next-generation study into cellular safety prepares cellular pros for the ever-looming subsequent waves of protection threats.
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Extra resources for Security for mobile networks and platforms
Example text
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).
