I have read lot of pdf and online content on symmetry cryptography, 90% of the sources I learned from says that ECB mode is a bad mode of operation due to known-plaintext attack.
My question is, how can an attacker be able to know the plaintext of a cipher text that are the same without the key, although when the same plaintext is encrypted in ECB mode, the cipher text is the same, but how can an attacker be able to know the plaintext of the same cipher text without knowing the key.
it is through guessing or what?
Just wanna know.