using rot13 and tr command for having an encrypted email address

Question

I have read many tutorials on the internet about the usage of the \'tr\' command. However, I am not able to understand how to encrypt an email address with a shell script sh

Answer 1

# Reciprocal Transformation(s)

# rot13
tr 'A-Za-z' 'N-ZA-Mn-za-m' <<< 'user@domain.com'

# rot13.5 (rot18)
tr 'A-Za-z0-9' 'N-ZA-Mn-za-m5-90-4' <<< 'user123@domain.com'

# rot47
tr '\!-~' 'P-~\!-O' <<< 'user123@domain.com'

# rot13 -- SED anyone
echo 'user@domain.com' | sed y/NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm/ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz/

Shell Script

#!/bin/bash
# Purpose: Rotate 13 characters (a reciprocal transformation)

# ./rot13.sh 'A String to look Ciphered'
tr 'A-Za-z' 'N-ZA-Mn-za-m' <<< "$1"

exit $?