4 ms·
The definition of a symmetric cipher requires the cipher text to be (practically) indistinguishable from random. Length is not particularly useful (multiple blo
by reyan 14y ago
The definition of a symmetric cipher requires the cipher text to be (practically) indistinguishable from random. Length is not particularly useful (multiple blocks, different block ciphers with equal block length).
- gcr 14y agoLots of developers who read "Learn PHP in 24 Hours" and similar texts use md5 (32 chars) or sha1 (40 chars). If you're an attacker and see a hex string that's 40 chars long, that gives you a great place to start since you know it's likely to be a naïve SHA1 hash.
- reyan 14y agoIf Evernote is not using a key derivation function, I don't know what to say.