Can someone tell me which mode out of ECB and CBC is better, and how to decide which mode to use? Are there any other modes which are better?
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Should I use ECB or CBC encryption mode for my block cipher?
ECB is not secure, it leaks information. CBC is better. But if you need random access to your file Use CTR mode.
For more information about Block cipher modes of operation see the Wikipedia article.
Never use ECB! It is insecure.
I recommend an authenticated encryption mode, like EAX or GCM. If you can't use authenticated encryption, use CBC or CTR mode encryption, and then apply a MAC (e.g., AES-CMAC or SHA1-HMAC) to the resulting ciphertext.
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