Here are some ciphers you could use to try out this program. It can solve them all if you work out the type of cipher and keylength for each one (there are some other tools on this website you might find handy for that!) Once you've decrypted each one, you could try changing some of the advanced options to see if you can find the optimum parameters for the fastest average solve time... good luck!

• Challenge 9A from the National Cipher Challenge 2020 SE. Bear in mind that if you are competing in the competition you must write your own programs to solve the ciphers, but since this one is over you can use it for some practice!