A weak but useful encryption using TR

[encrypt]
echo "vikas6@" | tr 'a-zA-Z0-9@_' 'j-za-iJ-ZA-I5-90-4*@'

[decrypt just reverse]
echo "ertjb1*" | tr 'j-za-iJ-ZA-I5-90-4*@' 'a-zA-Z0-9@_'