PERANCANGAN APLIKASI PENGAMANAN DATA DENGAN ALGORITMA CAESAR CIPHER DIKOMBINASIKAN DENGAN METODE MERKLE HELLMAN KNAPSACK

Abstract

The security of text data is something that needs to be considered in maintaining the confidentiality of the data itself, especially if the text data is only known to certain parties. There are many approaches taken to realize the confidentiality of the data, starting from physical security or protection to the form of a math-based algorithm that makes the data unreadable. Data security using encryption and decryption is known as cryptography, as a science or art to secure messages or data by disguising the message so that it can only be read by the sender and recipient of the message. Data security on network traffic is something that everyone wants to maintain privacy, so that data is sent safely from interference by irresponsible people, which is hidden using cryptographic algorithms. Application testing in encryption and decryption produces ciphertext in the form of a series of numbers and produces the same input plaintext as the output plaintext of the decryption process. This encryption is more secure than cryptographic methods that produce encryption in text form. The usual way to strengthen security is to use cryptography so that people will not suspect if the message has been encrypted and people will still think that the file does not contain a secret message. One of the techniques used in cryptography is the Caesar cipher algorithm combined with the Knapsack Merkle Hellman method.