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  • Code Design for Dependable Systems - Preface
    expressed and studied using generator polynomials. In this book,. the former codes are called matrix codes and the latter polynomial codes. So far,. traditional coding theory has been studied mainly using code generator polynomials. We. emphasize that the linear codes expressed in polynomials can always
  • Cyclic Redundancy Code (CRC)
    AN1148 Cyclic Redundancy Check (CRC) Consider a message of 'M' of 'k' bits and generator Author: Sudhir Bommena polynomial 'G' of 'n + 1' bits. Dividing the message by Microchip Technology Inc. the generator will yield a remainder 'R' of 'n' bits. There- fore, M = GQ + R; where Q is the quotient
  • Using KEELOQ (R) to generate Hopping Passwords
    The purpose of this application note is to demonstrate how KEELOQ (R) code hopping technology can be conveniently employed to implement an automatic code hopping password generator/keypad. Using a PIC12C508, the hopping code produced by an HCS300 is converted to a string of 16 hex digits
  • Data Encryption Routines for PIC24 and dsPIC Devices
    that they were able to crack a DES code within days. FIGURE 1: ORIGINAL DES ALGORITHM Plaintext Key IP Permutation Left Half E PermutationRight Half Subkey Generator -1 IP Permutation

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