Abstract
In this paper, a bit-level secret-key block cipher system is proposed which follows the principle of substitution. The decimal equivalent of the block under consideration is is evaluated and the modulo-2 operation is performed to check if the integral value is even or odd. Then the position of that integral value in the series of natural even or odd numbers is evaluated. The same process is repeated again with this positional value. This process is carried out recursively for a finite number of times, equal to the length of the source block. After each modulo-2 operation, 0 or 1 is pushed to the output stream in MSB-to-LSB direction depending on whether the integral value is even or odd, respectively. During decryption, bits in the target block are to be considered along LSB-to-MSB direction after which we get an integral value, the binary equivalent of which is the source block.
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© 2004 Springer-Verlag Berlin Heidelberg
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Dutta, S., Mandal, J.K. (2004). Ensuring e-Security Using a Private-Key Cryptographic System Following Recursive Positional Modulo-2 Substitutions. In: Manandhar, S., Austin, J., Desai, U., Oyanagi, Y., Talukder, A.K. (eds) Applied Computing. AACC 2004. Lecture Notes in Computer Science, vol 3285. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-30176-9_42
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DOI: https://doi.org/10.1007/978-3-540-30176-9_42
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-23659-7
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