This spreadsheet demonstrates a very simple scheme for encoding a message with a secret key. The spreadsheet alows you to edit the key or the message. Note that this example just illustrates the concept and wouldn't really be very secure.
The simple spreadsheet examples on this page may be copied freely – but they are not secure!
Supporting material for the book Learning and Teaching for Mathematical Literacy by Hugh Burkhardt, Daniel Pead and Kaye Stacey (ISBN 9781032301174).
Contents of ltml.mathlit.org website – except where specified otherwise and excluding external link content - Copyright © Hugh Burkhardt, Kaye Stacey, Daniel Pead 2024, all rights reserved. These materials are offered "as is" with no warranty as to accuracy or fitness for purpose.
SIte operated by the BBDSC Trust