## Theory

With a key of 'CRYPTOGRAM' and a starting shift of 10, what is the Condi cipher for the plaintext version of: canyoucanacan:

First we start with the keyword ('CRYPTOGRAM') and layout the rest of the alphabet:

1 2 3 4 5 6 7 8 9 10 11 12 13 C R Y P T O G A M B D E F 14 15 16 17 18 19 20 21 22 23 24 25 26 H I J K L N Q S U V W X Z

For a message of 'On the first day I got lost.', we select an initial shift of 10. We start with 'O' and then move 10 places to 'J'. Next we have an 'n', so that we move next the first letter ('O') by 19 places. This gives 'X'. The result is:

plaintext: On the first day I got lost. ciphertext: JX WNZ XRKVZ JND L UFD VWCZ.