C language to write a simple file encryption/decryption tool, the file is encrypted as sec file, can not be recognized by other programs. Decryption can be intact to change back to the original file (after testing, pictures, video encryption can be decrypted to open and play). When using (display: Error, file can not be found) Enter a prime number Password: 223092871 (2 to 23 all prime multiplication plus one, not easy to be cracked), press Enter to turn on encryption/decryption function. Show what would you do? (1/2), 1 for encrypting the entire folder of the file, 2 for decrypting the entire folder of the file Be sure to note that the generated exe file name must be enc.exe to avoid decrypting itself while decrypting itself

enc.cpp
enc.exe

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