Cryptography is a very old science, whose goal is to secure communication, so that only its recipient could read it.

There are a lot of methods to encrypt a message, from the simplest (such as the 2,000-year-old Caesar cipher) to the most complex (such as the World War 2 Enigma code); they all need both encryption and decryption keys (sometimes identical).

In some cases (such as the Hill cipher), the key is represented by a matrix.

You have to carry out such a matrix-based ciphering software, using the following process to encrypt :

• Transcript the key into numbers using the ASCII table,
• Convert the numbered key into a square matrix, the smallest possible size, and filling the lines first,
• Transcript the clear message into numbers using the ASCII table,
• Convert the numbered message into a matrix; its number of columns should fit the key matrix size, and its number of lines should be as small as possible,
• Multiply the 2 matrices, and write the answer linearly to get the encrypted message.

  git clone [email protected]:Yahia-Abdchafee-ADAM/103cipher.git 103cipher
  cd 103cipher