Description: . File encryption program requirements: A, file names from the keyboard. B, the encryption key from the keyboard. Idea: read the content from the original file into the buffer, encrypt, re-write the file back to its original place. Tip points: A, encryption can use the " exclusive or" operation. B, related interrupting 3DH, 3EH, 3FH, 40H, 42H number system function call (INT 21H).
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