Des C++ Source Code

Des C++ Source Code. OverviewCompilation & InstallationUsageMoreThe Data Encryption Standard (DES) is a block cipher (a form of shared secret encryption) that was selected by the NationalBureau of Standards as an official Federal Information Processing Standard (FIPS) for the United States in 1976 and whichhas subsequently enjoyed widespread use internationally It is based on a symmetrickey algorithm that uses a 56bit key This implementation of DES is not optimized in any way The code has been written to provide readability and easyunderstanding of the algorithm Padding scheme used in this implementation is [PKCS5] This implementation has only been tested on Unix platform But you may be able to compile/ run it on Windows 1 Make sure desc desh and run_desc are in the same directory 2 Compile using gcc O3 desc run_desc o run_deso Say we want to encrypt/ decrypt a file named /home/user/sampletxt 1 Generate a keyfile usingrun_deso g /tmp/keyfilekey 2 Encrypt sampletxt usingrun_deso e /tmp/keyfilekey /home/user/sampletxt /home/user/sampleenc 3 Decrypt sampletxt usingrun_deso d /tmp/keyfilekey /home/user/sampleenc /home/user/sample_decryptedtxt Don&#39t lose the key file! you won&#39t be able to decrypt an encrypted if you lose the keyfile DES is provided for educational purposes only Do not use for any other reasonIt has been implemented after J Orlin Grabbe&#39s DES Algorithm Illustrated It is possible to use this implementation to facilitate TripleDES encryption process 1 Generate keys usingrun_deso g /tmp/keyfile1keyrun_deso g /tmp/keyfile2keyrun_deso g /tmp/keyfile3key 2 Encrypt usingrun_deso e /tmp/keyfile1key /home/user/sampletxt /home/user/sampleenc1run_deso e /tmp/keyfile2key /home/user/sampleenc1 /home/user/sampleenc2run_deso e /tmp/keyfile3key /home/user/sampleenc2 /home/user/sampleenc3 3 Decrypt usingrun_deso d /tmp/keyfile3key /home/user/sampleenc3 /home/user/sampledec3run_deso d /tmp/keyfile2key /home/user/sampledec3 /home/user/sampledec2run_deso d /tmp/keyfile1key /home/user/sampledec2 /home/user/sample_decryptedtxt The primary repository for DES is located at http//githubcom/tarequeh/DES/ The blog postdiscussing the implementation can be found at CodeXN.

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GitHub tarequeh/DES: Implementation of Data Encryption

DES (Data Encryption Standard) This code designed to help researchers and students to study and analyze the structure of DES plainText and a cypherKey must be a 64bit long All encryption rounds will be printed out on each run The code structure is based on “Cryptography and Network Security” by Behrouz A Forouzan EXAMPLE.

GitHub micromin/DataEncryptionStandard: DES algorithm

Des d1 char *plaintext=new char[64] char *chyphertext=new char[64] hopen(“requisititxt”iosin|iosbinary) kopen(“requisiti2txt”iosout|iosbinary) while(!heof()) { hread(plaintext64) chyphertext=d1Encrypt(plaintext) //decryption is the samejust change Encrypt to Decrypt kwrite(chyphertext64) } hclose() kclose() remove(“requisititxt”) rename(“requisiti2txt””requisititxt”).

GitHub n3oxmind/DESCryptography: DES (Data Encryption

DataEncryptionStandardDES DES is an encryption algorithm developed in early 1970s It is mainly used for protecting sensitive electronic data DES ciphers a given Message into an Encrypted Value (ciphered message) by using a given Key I implemented the DES algorithm in assembly For this purpose I first implemented DES in C++ and then translated the C++ code into assembly.