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GCM Personally, I would go for GCM (Galois Counter Mode) since it is efficient – meaning: it handles pretty much everything you’ld expect from it, while other modes sometimes tend to lack a specific feature here and there (see image below for a comparison that shows what I’m hinting at). Also, GCM has a pretty good performance (assuming non-flawed ...


I would pick EAX as it is by far the simplest to implement and therefore to understand and audit. It is reasonably fast if based on AES. GCM seems quite popular, but I personally see a number of issues with it: it is very difficult to implement in software (which is not surprising, since it was developed with hardware in mind). it is slower than it seems ...

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