نوشتن برنامه ای به زبان پایتون در ارتباط با پیاده سازی رمزنگاری DES

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شرح پروژه

Implement an encryption function of DES Algorithm as discussed in the lecture. Furthermore, you are
need to perform an initial permutation and a final permutation as illustrated in the following figure.DES performs an input plaintext in three phases: First, the 64-bit plaintext passes through an initial permutation (IP) that rearranges the bits to produce the permuted input. This is followed by a phase consisting of sixteen rounds of the same function, which involves both permutation and substitution functions. The output of the last (sixteenth) round consists of 64 bits that are a function of the input plaintext and the key. The left and right halves of the output are swapped to produce the preoutput.
Finally, the preoutput is passed through a final permutation [IP -1] that is the inverse of the initial
permutation function, to produce the 64-bit ciphertext.The following table specifies the final permutation to produce the 64-bit ciphertext. The meaning is as follows: the output of the Final Permutation has bit 40 of the preoutput block as its first bit, bit 8 as its second bit, and so on, until bit 25 of the preoutput block is the last bit of the output.

2. Implement a decryption function of DES Algorithm. As with any Feistel cipher, decryption uses the same algorithm as encryption, except that the application of the subkeys is reversed. Additionally, the initial and final permutations are reversed.

Deadline For it: 24 Akar

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