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Since its release in November 2001, the Advanced Encryption Standard (NIST FIPS-197) has been the subject of extensive cryptanalysis research. The importance of this research has intensified since AES was named, in 2003, by NSA as a Type-1 Suite B Encryption Algorithm (CNSSP-15). As such, AES is now authorized to protect classified and unclassified national security systems and information. This paper provides an overview of current cryptanalysis research on the AES cryptographic algorithm. Discussion is provided on the impact by each technique to the strength of the algorithm in national security applications. The paper is concluded with an attempt at a forecast of the usable life of AES in these applications.
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