Answer by brandtrock for Why not use larger cipher keys?
The OP asked: "So in other words what is the consequences of choosing a cipher key that is too large...?" A 256-bit key is plenty strong, as proven by the comments here; however, a very secure key...
View ArticleAnswer by user for Why not use larger cipher keys?
In a way, algorithms using such "insanely large" keys already exist. It's called one-time pads. Nobody really uses them in practice, though, since they require a key the length of the message you wish...
View ArticleAnswer by lynks for Why not use larger cipher keys?
I dug out my copy of Applied Cryptography to answer this concerning symmetric crypto, 256 is plenty and probably will be for a long long time. Schneier explains;Longer key lengths are better, but only...
View ArticleAnswer by guidot for Why not use larger cipher keys?
Processing time was already mentioned. Even in that respect the time required to generate an RSA key should be mentioned separately, since it is MUCH more costly for longer keys, since you need to find...
View ArticleAnswer by Cyrus for Why not use larger cipher keys?
Adding more evidence to the "because it slows things down unnecessarily" answers, it seems like AES execution time doesn't grow as fast as RSA when key length goes up (and RC6 grows even more slowly),...
View ArticleAnswer by AJ Henderson for Why not use larger cipher keys?
Processing time, pure and simple. Everything in security is a balancing act between the need for security (keeping the bad people out), and useability (letting the good people in). Encryption is a...
View ArticleAnswer by user11869 for Why not use larger cipher keys?
For one AES is built for three key sizes 128, 192 or 256 bits. Currently, brute-forcing 128 bits is not even close to feasible. Hypothetically, if an AES Key had 129 bits, it would take twice as long...
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Answer by Fredefl for Why not use larger cipher keys?
The reason why RSA keys are so small is that:With every doubling of the RSA key length, decryption is 6-7 times times slower.So this is just another of the security-convenience tradeoffs.Here's a...
View ArticleWhy not use larger cipher keys?
RSA Security commonly uses keys of sizes 1024-bit, 2048-bit or even 3072-bit. And most Symmetric algorithms only between 112-bit and 256-bit. I do realize that the current keys are secure enough for...
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