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A cipher is considered to be reasonably secure if no known method for cracking it exists. True or false?
True
False
True. When all other techniques have been exhausted, brute force is all you have left, and it's a lot more difficult and time-consuming. EDIT: There is no such thing as secure in this field. Just because a cracking method is unknown doesn't mean someone hasn't broken it without disclosing it or planted a backdoor. So I added 'reasonably' and 'known' to the question. still bad wording, no one knew about the NSA monitoring our communications using back doors until Snowden. Edit 2: "Known" includes what the NSA knows too. The question doesn't say "publically known", just "known". [EDIT] Further, there may be known ways of breaking the cipher, but there aren't enough resources to execute the attack. We know how to factor RSA keys, but we don't have the resources to factor, say, 2048-bit RSA keys. This question is bad.
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