C. E. Shannon, "Communication theory of secrecy sys- enough to resist a known plaintext cryptanalytic attack, thereby tems," Bell Syst. Tech. J., vol. 28, pp. 656--715, Oct. 1949. eliminating the burden of keeping old messages secret. Each  Home/Search   Document Not in Database   Summary   Related Articles

....blems, however, sometimes make it convenient to distinguish unbreakable [2, pp. 398 400] The theoretical basis underlying between them. this and related systems was on a firm foundation a quarter Figure 1 illustrates the flow of information in a conventional century later by information theory [3]. One time pads require cryptographic system used for privacy of communications. extremely long days and are therefore prohibitively expensive There are three parties: a transmitter, a receiver, and an eavesin most applications. dropper. The transmitter generates a plaintext or unenciphered In ....

....which can resist any cryptanalytic attack, no matter how much computation is allowed, is called unconditionally large changes in the deciphered plaintext. This intentional error propagation ensures that if the deliberate injection of noise on secure. Unconditionally secure systems are discussed in [3] and [4] and belong to that portion of information theory, called the the channel changes a message such as erase file 7 into a different message such as erase file 8, it will also corrupt the Shannon theory, which is concerned with optimal performance obtainable with unlimited computation. ....

C. E. Shannon, "Communication theory of secrecy sys- enough to resist a known plaintext cryptanalytic attack, thereby tems," Bell Syst. Tech. J., vol. 28, pp. 656--715, Oct. 1949. eliminating the burden of keeping old messages secret. Each

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