“The U.S. National Security Agency (NSA) has the technical capacity to crack the most commonly-used cellphone encryption technology, and in doing so it can decode and access the content of calls and text messages.  Citing a top-secret document leaked by Edward Snowden, the report states that the agency can easily break a technology called A5/1, the world’s most common stream cipher used to encrypt cellular data as it transmits to cell towers.  AT&T, the largest GSM provider in the U.S., is in the process of upgrading its networks to what’s called A5/3 encryption, the Post reports, which requires 100,000 times more computing power to break compared to A5/1.”

http://mashable.com/2013/12/13/nsa-cellphone-encryption/

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