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It's both cracked and uncracked... until you look at it.

Well at wat kind of safety mechanisms will we be safe at? Everything has a reverse process, xpt Life & Death.
am just a beginner of this security issue, but i think its good to know at what levels these mechanism provide security.
Great article.

"The most secure codes currently in use rely on public-key cryptography..." Not so. you correctly state that public-key crypto relies on the difficulty of computing certain mathematical functions. At present, it's not possible to verify how hard these problems actually are, so it's conceivable that a computational breakthrough could come at any time. Most cryptographers would regard strong symmetric key ciphers as providing the "most secure codes". Public-key cryptography is used not because it is more secure, but because it vastly simplifies the problem of key management. Most often it is used only for key generation or key exchange, since it is much slower than symmetric key crypto for bulk encryption and decryption.

Quantum cryptography is analogous to public-key crypto in that its primary use is for key exchange.

There has long been an encryption mechanism that is "unbreakable in theory" - the Vernam cipher, a.k.a the "one-time pad". It's almost never secure in practice due to difficulties of implementation and use, and it appears that quantum cryptography may suffer from a similar flaw.