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Originally Posted by Nodrog
No (non-quantum) encryption is literally unbreakable, but you can reduce the probability of it being broken by brute force so low that it become unbreakable in practice. RSA with a significantly long key length is pretty much unbreakable, and implementations such as PGP have been banned in America as a result  |
That's wrong. One time pads where the pad is the length of the message are unbreakable, unless you can get hold of the encryption pad. The difficulty of course is ensuring that the pad is kept secure. Quantum Encryption is basically a method of generating a secure one time pad.