Each subsequent block of plaintext is then XOR'd with the previous block of ciphertext prior to encryption, hence the term “chaining.” Due to this XOR process, the same block of plaintext will no longer result in identical ciphertext being produced.ĭecryption in the CBC mode works in the reverse order. The resultant block is the first block of the ciphertext. The IV is a block of random bits of plaintext. In Cipher Block Chaining (CBC) mode, the first block of the plaintext is exclusive-OR'd (XOR'd), which is a binary function or operation that compares two bits and alters the output with a third bit, with an initialization vector (IV) prior to the application of the encryption key. In Next Generation SSH2 Implementation, 2009 Cipher Block Chaining Mode From this perspective, pipeline interleaving is easily recognized as a clever and efficient combination of time sharing with pipelining. Still, it yields useful architectures for any recursive computation - including nonlinear ones - provided that data items arrive as separate time-multiplexed streams that are to be processed independently from each other, or can be arranged to do so. Pipeline interleaving does obviously not qualify as an equivalence transform. All processing can so be carried out using a single pipelined datapath of p stages.
Rather than scanning the image row by row, pixels from p successive rows are entered one by one in a cyclic manner before the process is repeated with the next column, and so on. Markus Wenk)įor a much simpler example, consider some image processing algorithm where rows of pixels are dealt with independently from each other. The beneficial impact of pipeline interleaving on area and throughput of a sphere decoder circuit.
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