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2016-11-13 11:29:20 -0500 asked a question how do change a string of letters into integers using sagecell?

I am a high school teacher and I want to change letters into integers. Then, I am taking the numbers into a matrix mXn dimension. I want to show how to multiply matrices to encode a message. Then, decode the message by multiplying by the inverse of a matrix. I know some if any basics using sagemathcell or python.