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
Famous quotes containing the word performance:
“There are people who think that wrestling is an ignoble sport. Wrestling is not sport, it is a spectacle, and it is no more ignoble to attend a wrestled performance of suffering than a performance of the sorrows of Arnolphe or Andromaque.”
—Roland Barthes (1915–1980)
“The way to go to the circus, however, is with someone who has seen perhaps one theatrical performance before in his life and that in the High School hall.... The scales of sophistication are struck from your eyes and you see in the circus a gathering of men and women who are able to do things as a matter of course which you couldn’t do if your life depended on it.”
—Robert Benchley (1889–1945)
“When a book, any sort of book, reaches a certain intensity of artistic performance it becomes literature. That intensity may be a matter of style, situation, character, emotional tone, or idea, or half a dozen other things. It may also be a perfection of control over the movement of a story similar to the control a great pitcher has over the ball.”
—Raymond Chandler (1888–1959)