Basically, confidential data needs to be stored or conveyed in a certain way so that it is not known by unauthorized foreign parties. And to overcome this problem, the science of cryptography and steganography was created. Cryptography is the art and science of keeping messages confidential by disguising them in an encoded form that has no meaning, while steganography is the art and science of hiding secret messages inside other messages so that the whereabouts of the secret message cannot be known. Steganography keeps
messages secret by hiding messages. The current implementation of steganography uses digital media as a medium for storing or hiding messages, one of which is image media (digital image). The combination of cryptography and steganography can provide better security for secret messages, where secret messages are first encrypted using the ElGamal algorithm, then the ciphertext results from the cryptography are hidden in image media using the Least Significant Bit (LSB) steganography method. The implementation of cryptographic algorithms and steganography methods can further increase the security of secret messages.
Keywords: Ciphertext, Cryptography, ElGamal, Encryption, Steganograph