You could do worse than to confuse the meanings of "code" and "cipher"—even cryptographers sometime use the terms as though they had the same meaning. There is, however, a definite distinction between ...

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 simple ...

Understand the crypto concepts behind the modern internet security infrastructure, from digital signatures and transport layer security to blockchains and Bitcoin. Cryptography grows ever more ...

J K Rowling’s The Hallmarked Man features the Pigpen Cipher, a centuries-old code once used by Freemasons and revolutionaries ...

Encryption is an essential tool for protecting data—but the technology can be a bit confusing. This ebook explains what encryption is, how it works, and why it’s so important. From the ebook: ...