The School of Mathematical Sciences at the University of Southampton warmly welcomes you to its 23rd national codebreaking competition. Whether you are new to codes and ciphers or an experienced competitor we hope you will find something to stretch you, something to entertain you, and a friendly community. With the generous support of our sponsors, GCHQ, EPSRC. Trinity College Cambridge and Northrup Grumman we are able to offer prizes, medals and certificates to record your achievements, but if you are anything like us it will be the feeling you get when you crack a cipher that makes it all worth while. Don’t delay. head over to our registration page and sign up!