Why using AES in ECB (Electronic Code Book) mode a bad idea? is CTR mode better? Given only these two can be used for parallelization.
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$\begingroup$ On the other hand, that makes your post's title completely different from your post's body. $\;$ $\endgroup$– user991May 31, 2015 at 9:56
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$\begingroup$ There are other parallelizable modes as well. Such as XTS and OCB. But to recommend a mode we need to understand your requirements. $\endgroup$– CodesInChaosMay 31, 2015 at 11:51
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ECB is bad because identical plaintext blocks result in identical ciphertext blocks. Encrypted data is therefore not pseudo-random.
This is how Tux looks like after ECB encryption:
CTR mode doesn't have this problem. Data encrypted with CTR mode is pseudo-random and doesn't show any pattern. So CTR is much better.
CBC and CFB can also decrypt parallel, but not encrypt.
