From New York times, A German enginner Karsten Nohl claimed that he’d already defeated by deciphering and showing weakness in GSM security which used in almost cellular system in worldwide in chaos Communication Congress. The Chiphering algorithm known as A5 claimed weak and no secure anymore.
As we know that GSM standard using A5 for privacy algorithm named Ciphering algorithm which has 64 bit binary code, but for now it is available for 128 bit binary code. The latest known as algorithm A5/3, and for 64bit binary code known as A5/1 which is claimed already weakness and should be replaced.
Maybe if you are not familiar with telecom term, you can analogy it with another one like Wireless technology Wi-Fi which has security standard like WEP ” Wired Equivalent Privacy“. But it has been changed to WPA (Wi-Fi Protected Access ) or WPA2.
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