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1

I just found a quote from our big friend Bruce Schneier in [A self-study course in block-cipher cryptanalysis][2] Chapter 2 "What does it mean to "break" a cipher". Breaking a cipher simply means finding a weakness in the cipher that can be exploited with a complexity less than brute-force. I also found this a [comment][3] in an article [AES crypto ...

4

Your explanation is "broken in the academically sense" - there is a theoretical way to break the algorithm better than brute force. AES is broken in this way. There's also "broken in the practical sense", which means you can break an cipher in real applications or protocols. AES is still save in this sense, because you still need too much compution power and ...

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In general, a cipher is broken if it is possible to win the following game. The game has two players, the challenger and the defender. The challenger selects a pair of messages, $m_0$ and $m_1$. The defender selects an encryption key, $k$, and encrypts either $m_0$ or $m_1$. He then sends the resultant cipher text for his chosen message to the challenger. ...

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