how to generate string generation from keyword

I am looking for an algorithm for string generation based on a keyword for a project I am trying to do in java.

Basically what I want to do is generate a string of characters (alphabets, numbers and symbols) meaninglessly arranged in a line in a way that one keyword produces the same string every time.

I am not sure is any algorithm exists that serves this purpose but I am looking for one. I would like to make an algorithm that serves this purpose, for which I would like to get suggestion from the Stack Overflow community.