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:
“True balance requires assigning realistic performance expectations to each of our roles. True balance requires us to acknowledge that our performance in some areas is more important than in others. True balance demands that we determine what accomplishments give us honest satisfaction as well as what failures cause us intolerable grief.”
—Melinda M. Marshall (20th century)
“Kind are her answers,
But her performance keeps no day;
Breaks time, as dancers,
From their own music when they stray.”
—Thomas Campion (1567–1620)
“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)