I suppose that your different keys are actually dynamically generated from a given master key and a kind of counter which is associated with each database line e. The ECB encryption mode also has other weaknesses, such as the fact that it's highly malleable : as each block of plaintext is separately encrypted, an attacker can easily generate new valid ciphertexts by piecing together blocks from previously observed ciphertexts. The encrypted text that we save is sent by clients to our server, and it's already ciphered. Would that seem like a good approach?
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Viewed 18k times. It only takes a minute to sign up. Given only what you've said, and assuming the keys are created and stored in a strong manner, using a different key to encrypt database entries mitigates the problem of ECB mode. An actual case of this weakness of ECB encryption contributing to a real-world data compromise is given by the Adobe password database leak , as described in this answer. I just wanted to know what an attacker could possibly do if he gets hold of a database with tons of entries encrypted with AES in ECB mode in order to decrypt that information and if such a thing is feasible.
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As Guut Boy mentioned it, ECB isn't semantically secure, in the sense that if a message with identical blocks is encrypted, then an attacker get a certain advantage to have information on plaintext, by only observing CipherText. Contact us Green Jobs. This is not good advice. Ilmari Karonen Ilmari Karonen Homework: Hints in comments or answers?
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