The plaintext is grouped by 64 bits, the key is 64 bits long, and the key is actually 56 bits involved in the DES operation (bits 8, 16, 24, 32, 40, 48, 56, 64 are parity bits, The key has an odd number of 1) after the group of the plaintext group and the 56-bit key in place by bit or exchange method to form a ciphertext group encryption method.

bool.h
Debug
.....\main.exe
.....\main.ilk
.....\main.obj
.....\main.pch
.....\main.pdb
.....\vc60.idb
.....\vc60.pdb
des.txt
main.c
main.dsp
main.dsw
main.ncb
main.opt
main.plg
tables.h

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