Cipher Documentation:

a1z26:

• Encryption: The program will convert any message that uses only letters to its numerical equivalent (a = 1, b = 2, c = 3....z = 26).
• Decryption: The program will convert any message that uses only positive integers to its alphabetical equivalent. Each integer is separated by a space.

atbash:

• Encryption: The program will translate any message such that the letters are reversed (a = z, b = y, etc.).
• Decryption: Same as encryption.

caesar:

• Encryption: The program will encrypt a message by shifting every letter a certain amount, i.e., the user-provided shift number. The shift number must be a positive integer. More information can be found here: https://en.wikipedia.org/wiki/Caesar_cipher
• Decryption: Reverses the process described above.

columnar:

• Encryption: The program will encrypt and display a message in columnar transposition given a letter-only key. More information can be found here: https://crypto.interactive-maths.com/columnar-transposition-cipher.html
• Decryption: Reverses the process described above.

railfence:

• Encryption: The program will encrypt and display a message in rail fence given a positive integer key. More information can be found here: https://en.wikipedia.org/wiki/Rail_fence_cipher
• Decryption: Reverses the process described above.

morse:

• Encryption: The program will encrypt a message in written morse code. Spaces separate letters and the "/" symbol separates words. More information can be found here: https://en.wikipedia.org/wiki/Morse_code
• Decryption: Reverses the process described above.

vigenere:

• Encryption: The program will encrypt a message in Vigenère given a letter-only key. More information can be found here: https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher
• Decryption: Reverses the process described above.