Шифровальная система PGP - настолько ли она надежна?

[CHaSE]

Выдержки из справки PGP:

No data security system is impenetrable. In any data security system, you have to ask yourself if the information you are trying to protect is more valuable to your attacker than the cost of the attack. This should lead you to protecting yourself from the cheapest attacks, while not worrying about the more expensive attacks.
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Perhaps the government has some classified methods of cracking the conventional encryption algorithms used in PGP. This is every cryptographer’s worst nightmare. There can be no absolute security guarantees in practical cryptographic implementations.
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Still, some optimism seems justified. The public key algorithms, message digest algorithms, and block ciphers used in PGP were designed by some of the best cryptographers in the world. PGP’s algorithms have had extensive security analysis and peer review from some of the best cryptanalysts in the unclassified world.
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The computational workload to crack it is likely to be much more expensive than the value of the message. If your situation justifies worrying about very formidable attacks of this caliber, then perhaps you should contact a data security consultant for some customized data security approaches tailored to your special needs.
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If you protect yourself against the simplest attacks, and you feel confident that your privacy is not going to be violated by a determined and highly resourceful attacker, then you'll probably be safe using PGP. PGP gives you Pretty Good Privacy.

Как итог: с точки зрения криптоанализа уязвимости неизвестны. Однако более общих методов никто не отменял - brute force, неполностью стертые файлы, записанная на салфетке кодовая фраза, раскаленный утюг... ;)