if the WINRAR encryption method(AES) is so unbreakable(by brute force), then why doesn't every software use a similiar encryption method?
closed as off topic by mikeazo♦ Nov 9 '12 at 14:47
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Well, the applications that need that particular type of protection do. Or rather, those that realize they need it, do.
Those that use weaker crypto do so for a variety of reasons: