A second scheme that will be discussed is a new mode of use for a block cipher thatwas put forward in [188]. The main goal of the “random code chaining” (RCC)mode is to make it easier to modify part of the plaintext, while keeping the chaining ofblocks and a limited error propagation. The disadvantage is the redundancy of 50%.The ciphertext corresponding to t n/2-bit plaintext blocks is equal to
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