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Security
- Make your own cipherdisc and make and break secret codes! Template and instructions downloadable from www.cse.salford.ac.uk/schools/
- Find out more about the past, the present and the future of codes by reading The Code Book: The Secret History of Codes and Code-breaking, Simon Singh, Fourth Estate; New Ed edition (2000), ISBN-10: 1857028899, ISBN-13: 978-1857028898
- Download an interactive CD ROM about codes from www.simonsingh.net/Code_Book_Download.html and try your hand at code-breaking
- Find out more about the expert code-breakers during the Second World War at www.bletchleypark.org.uk/edu/teachers/ccresources.rhtm