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When it comes to cryptographic software, side channels are an often-overlooked threat. A side channel is any observable side effect of computation that an attacker could measure and possibly influence. In the software world, side-channel attacks have sometimes been dismissed as impractical. However, new system architecture features, such as larger cache sizes and multicore processors, have increased the prevalence of side channels and quality of measurement available to an attacker. This article explains three recent side-channel attacks on cryptographic software, exploiting a comparison function, CPU cache timing, and branch prediction logic to recover a secret key. Software developers must be aware of the potential for side-channel attacks and plan appropriately.