د.اسماء محمد كنان2024-11-252024-11-25https://dspace.academy.edu.ly/handle/123456789/319Cryptography has been known since about two thousand years BC. It was use it by armies' leaders in the military field. The leaders were keen through it to preserve and protect its secret messages away from the eyes of others. So it was military plans and methods of attacking the enemy were send by handwritten messages, but they are encrypted in one of the encryption methods. Fearing that it would fall into the hands of the enemy and thus their plans would fail. It was mentioned that the first peopleEncryption algorithms and decryption algorithms have evolved greatly. This development has led to the construction of new algorithms against decryption algorithms, which enables us to reach a large extend of security. Cryptography techniques have taken a huge leap from very easy methods to very difficult arithmetic operations. In this thesis we study one of cryptography techniques which is the use of the Laplace transform in cryptography, it came up with a wonderful solution to provide the necessary protection to prevent any kind of attack, also we presented algorithm for applying the Laplace transform for encryption and the inverse Laplace transform for decryption. We applied this transformation to the trigonometric functions, which were represented by Maclaurin series, then by calculating the remainder we get the quotients that form the private keys to encrypt the plain text and convert it into cipher text and vicekversa.Cryptography Using Laplace Transform