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If by authenticated encryption we mean encrypt-then-MAC then that provides some mitigation against side channel attacks - timing, error responses etc - because it allows you to detect that the message has been tampered before you start decrypting it and in something hopefully close to constant time. It is perhaps worth mentioning that in TLS the opposite ...


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I suggest that you look at Signcryption; a short survey appears here, and efficient schemes appear here. Just signing then encrypting or vice versa in a naive way is not secure (especially in the multi-user setting). So you have to do this right. Once you have a concrete scheme, you then have to see what level of security the encryption scheme needs to be. ...



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