Performance
OCB performance overhead is minimal comparing to classical, non-authenticating modes like CBC. OCB requires one block cipher operation per each block of encrypted and authenticated message and one block cipher operation per each block of additional associated data. There are also two extra encryptions required at the end of process.
For comparison, CCM mode offering similar functionality requires twice as many block cipher operations per each message block (associated data requires one as in OCB).
Read more about this topic: OCB Mode
Famous quotes containing the word performance:
“Just as the performance of the vilest and most wicked deeds requires spirit and talent, so even the greatest demand a certain insensitivity which under other circumstances we would call stupidity.”
—G.C. (Georg Christoph)
“Nobody can misunderstand a boy like his own mother.... Mothers at present can bring children into the world, but this performance is apt to mark the end of their capacities. They can’t even attend to the elementary animal requirements of their offspring. It is quite surprising how many children survive in spite of their mothers.”
—Norman Douglas (1868–1952)
“Still be kind,
And eke out our performance with your mind.”
—William Shakespeare (1564–1616)