Much like DES was broken for years, but never truly released to the public until quite some time later. I know that AES was more open to the public when it was initially developed, and many proposed models were rejected. However, could it be broken somehow, but not announced to the public. Or is it used by too many companies, that as soon as AES would break, it would make news?
for clarification: I am talking about the Rijndael cypher, which was adopted by the US government.