I'm not that sure about that. In the history of cryptography almost everything was broken in the end (though some peculiar stuff took a couple hundred years), b

I'm not that sure about that. In the history of cryptography almost everything was broken in the end (though some peculiar stuff took a couple hundred years), but it seems that with modern cryptography, which is very, very different from classic cryptography, breaking it is far more difficult, and the intervals at which algorithms fall apart seem to increase. For example, DES held out for about 20-25 years or so, with some cracks showing earlier than that. AES is now ~20 years old, and we don't have a discovered a single crack in it. SHA-2 is a similar vintage and no significant issues have been discovered. The previous generation of hashes only resisted ten years or so until the first real issues showed up.