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Most advantages have to do with the fact that it includes authentication. For example: An authenticated encryption primitive is easier to use correctly. Only a single primitive that has to be secure. One pass over the data to both encrypt and authenticate may be faster. (Bernstein's rebuttal is that a separate MAC allows faster detection of forgeries, ...


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Your idea is no stronger than simply having a common shared password $P_1$ from which the symmetric encryption key is derived. If Alice encrypts a message with Bob's hashed password, even if someone knows the shared password, only Bob can decrypt the message You assumed the hash of Bob's password – $H(B_1)$ – is public, so if Eve knows both it and the ...


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It is incorrect that Wikipedia does not mention other stream ciphers than the synchronous ones. It also mentions asynchronous ones (that is, where the keystream depends on the previous ciphertexts -- and thus, the previous plaintext) together with associated advantages: this allows re-synchronisation of the sending and receiving end. Additionally, an ...



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