Security of Image File with Tiny Encryption Algorithm And Modified Significant Bit Pseudo Random Number Generator

Abstract

One of the negative impacts of the development of the era of digital technology on communication media today is the damage and loss of information data. Access to communication media is a means of delivering information that is vulnerable to manipulation. Therefore, cryptography is used to keep the information confidential. Cryptography is an art in encoding messages into other forms so that the message cannot be read by unauthorized parties. Tiny Encryption Algorithm (TEA) algorithm is a symmetric cryptographic algorithm in which the key is divided into four subsections and uses 128 key bits and operates 64 bits of data blocks and then divided into two blocks into 32 bits during the encryption process. In order to make the encryption stronger, it is combined with steganography where the steganography method used is Least Significant Bit (LSB) which has the function of inserting data into the last bit of other data. Linear Congruential Generator (LCG) is a random number generator in the LSB method where its function is as a flow of inputting data that has been encrypted randomly into another data as a cover so that the combination of these methods becomes Modified Least Significant Bit Pseudo Random Number Generator. The combination of cryptography and steganography is able to create a security in sending a confidential message to be safer.