Secure Text is a comprehensive command-line application that implements classical encryption and decryption techniques. This educational tool demonstrates various historical cipher methods used ...

Notifications You must be signed in to change notification settings The Caesar cipher is one of the earliest known and simplest ciphers. It is a type of substitution cipher in which each letter in the ...

Hill cipher cryptosystem is a linear algebra‐based classical polygraphic substitution cipher‐based technique. If the encryption key matrix (also called the key matrix) is not invertible, obtaining the ...

You can make a message secret in countless different ways. One common way is to use a substitution cipher, in which one letter is substituted for another. Another is to employ a transposition cipher, ...