Page "Advanced Encryption Standard" Paragraph 38
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Wikipedia
Until May 2009, the only successful published attacks against the full AES were side-channel attacks on some specific implementations.
The National Security Agency ( NSA ) reviewed all the AES finalists, including Rijndael, and stated that all of them were secure enough for U. S. Government non-classified data.
In June 2003, the U. S. Government announced that AES could be used to protect classified information:
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