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Say you have a web application that's performing AES encryption. What sorts of side channel attacks should one keep an eye out for?

Timing attacks affect RSA more than symmetric ciphers in-so-far as I know.

Any ideas?

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This section on Wiki describes all side-channel attacks I know of (mostly cache timing and fault injection). But all of them kinda require the ability to run a program on the same machine or otherwise have some control over the machine (e.g. for fault injection). But if this is relevant to you, depends on your application/server. Some speculation: There was some nifty side-channel attack based on an RSA implementation based on the noise of the processor. Maybe no one has looked into that for AES ;) –  tylo Oct 7 at 15:54

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