Question: Create software that can encrypt and decrypt in 4-bit cipher feedback mode using one of the following ciphers: additive modulo 256, affine modulo 256, S-DES;

Create software that can encrypt and decrypt in 4-bit cipher feedback mode using one of the following ciphers: additive modulo 256, affine modulo 256, S-DES;

8-bit cipher feedback mode using one of the following ciphers: 2 * 2 Hill modulo 256. Test data for S-DES using a binary initialization vector of 1010 1011. A binary plaintext of 0001 0010 0011 0100 encrypted with a binary key of 01111 11101 should give a binary plaintext of 1110 1100 1111 1010. Decryption should work correspondingly.

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Below is a Python implementation of encryption and decryption in 4bit Cipher Feedback Mode using the SDES cipher def generateroundkeyskey key1 key8 key2 key8 roundkeys Apply P10 permutation key key12 ... View full answer

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