I'd say that a hydrogen bomb is self-sustaining. Self-sustenance is a key factor in the reaction. The problem with a hydrogen bomb is that it's not easy to harness the energy produced for anything useful (it's not a controlled self-sustaining source of energy).
PGP is extremely hard to crack from my knowledge Actually, PGP hasn't been cracked to anyone's knowledge. Of course, would the FBI or CIA tell us if they could crack it?
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I'd say that a hydrogen bomb is self-sustaining. Self-sustenance is a key factor in the reaction. The problem with a hydrogen bomb is that it's not easy to harness the energy produced for anything useful (it's not a controlled self-sustaining source of energy).
PGP is extremely hard to crack from my knowledge
Actually, PGP hasn't been cracked to anyone's knowledge. Of course, would the FBI or CIA tell us if they could crack it?