Witamy

A5 is a family of cryptographic algorithms used to ensure confidentiality of voice and data transmission in GSM. Family A5 include: Specification of algorithms A5 / 1 and A5 / 2 was kept secret [1], but thanks to reverse engineering and leakage of information, much of it became generally available in 1999. Algorithm A5 / 3 was published in the form of an open specification in 2007. At the beginning of 2009 the German team Karsten Nohl and Sascha KriĂźler published details of the attack time-memory trad