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The transmission of data coded by a convolutional or turbo code and secured by cryptographic check values is improved by using of Soft Input Decryption. An additional coding gain can be reached, when coded data with cryptographic check values are interleaved, decoded and decrypted in an iterative process with feedback from decryptor to channel decoder. The coding gains are given complimentary, because the cryptographic redundancy is added by security aspects, which become more and more important and common.
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