Performance
Being a two-pass scheme, EAX mode is slower than a well designed one-pass scheme based on the same primitives.
EAX mode has several desirable attributes, notably:
- provable security (dependent on the security of the underlying primitive cipher);
- message expansion is minimal, being limited to the overhead of the tag length;
- using CTR mode means the cipher need be implemented only for encryption, in simplifying implementation of some ciphers (especially desirable attribute for hardware implementation);
- the algorithm is "on-line", that means that can process a stream of data, using constant memory, without knowing total data length in advance;
- the algorithm can process static Associated Data (AD), useful for encryption/decryption of communication session parameters (where session parameters may represent the Associated Data).
Notably, CCM mode lacks the last 2 attributes.
Read more about this topic: EAX Mode
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