Implement Monoalphabetic Cipher Encryption And Decryption In Python

Viewed 4k times.Īlaska Alaska 11 1 1 silver badge 4 4 bronze badges. I've not implemented any controls on characters format uppercase, alphanumeric only, ecc Learn more. Now, you could speed up execution of this program by encrypting all of buffer before writing it back out to fp instead of encrypting and writing one character at a time, but you have the general idea now. Now, since you are replacing each single character with a single other character, this is easy enough to accomplish when overwriting the same file. You are doing nothing to write the output back to the file. What you have with your encrypt function is more of a scrambling cipher.Īn actual shift cipher, with the key 6, for example, and the English alphabet, would look like this. Your encrypt function is not really a shift cipher. Then once you're done, you can rename the written file to replace the input if you want to. You should open a second file for writing, and write the resulting characters there. All you do is print using putchar the encrypted character, there's no file writing code. The file doesn't change because your program does nothing that can change the contents of the file. I'm not sure, however, what exactly I'm missing. However, when I run the program, the text in the file is not encrypted. I'm creating a substitution cipher in c, reading characters from a text file and encrypting them.

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Implement Monoalphabetic Cipher Encryption And Decryption In Python