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Line 6: ;Task: Encrypt aan input/source file by replacing every upper/lower case alphabets of the source file with another predetermined upper/lower case alphabets or symbols and save it into another output/encrypted file and then again convert that output/encrypted file into original/decrypted file. This type of Encryption/Decryption scheme is often called a Substitution Cipher.

Substitution cipher: Difference between revisions

Substitution cipher (view source)