How the NSA (may have) put a backdoor in RSA’s cryptography: A technical primer

http://en.wikipedia.org/wiki/National_Security_Agency

There has been a lot of news lately about nefarious-sounding backdoors being inserted into cryptographic standards and toolkits. One algorithm, a pseudo-random bit generator, Dual_EC_DRBG, was ratified by the National Institute of Standards and Technology (NIST) in 2007 and is attracting a lot of attention for having a potential backdoor. This is the algorithm that the NSA reportedly paid RSA $10 million in exchange for making it the default way for its BSAFE crypto toolkit to generated random numbers.

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Story added 6. January 2014, content source with full text you can find at link above.