Abstract
Several modes of operation have been built upon block cipher security. Among them, CFB is considered to be one of the popular modes of operation because of its self-synchronizing property. Besides, appearance of OCFB makes CFB even more competitive. However, because of the stalling problem (i.e., there is a need to stall while doing block encryption) and the inability to arrange the keystream in advance, both the CFB and OCFB modes are considered to be inadequate for such real-time applications, where the appearance of inputs is expected to be uniform. In this article, researchers present a new mode of operation based on the underlying foundation of both the CFB and OCFB modes of operation, called real-time based optimized cipher feedback mode (RT-OCFB), which remedies this problem. They also argue that the proposed mode of operation (RT- OCFB) holds the similar imperative security properties as CFB and OCFB, which are indeed essential for modern cryptography.
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