SM4 (former name “SMS4”) is a cryptographic standard published by the Office of State Commercial Cryptography Administration (OSCCA) of SCA as an industry cryptographic standard in 2012, and ...

In Part I, you broke a simple cipher. Now try creating a more complex cipher. Cut out the NOVA Decoder Ring and NOVA Cipher Code Ring and the window marked INDEX. You are now going to put this ...

To prove you are up to the job, decode this cipher sent to you from your leader, Winston Churchill. Decode the cipher below. As you discover what each encrypted letter represents, print it over ...