# Why using AES in ECB (Electronic Code Book) mode a bad idea? [duplicate]

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.

• On the other hand, that makes your post's title completely different from your post's body. $\;$ – user991 May 31 '15 at 9:56
• There are other parallelizable modes as well. Such as XTS and OCB. But to recommend a mode we need to understand your requirements. – CodesInChaos May 31 '15 at 11:51