APLIKASI PENYEMBUNYIAN PESAN PADA CITRA DIGITAL DENGAN MENGGUNAKAN METODE KRIPTOGRAFI HILL CIPHER DAN TEKNIK LEAST SINGNIFICANT BIT

Abstract

Maintaining message confidentiality by encrypting it with cryptography renders it unreadable. This can raise suspicions that the message being sent is important. To avoid suspicion, the message can be hidden in the image, thus preventing such suspicion. Initially, the message is encrypted using the Hill Cipher cryptography method. The key to the Hill Cipher is a numeric value in the form of a matrix K. The encryption process uses the matrix K, while the decryption process uses the inverse matrix of K. Therefore, to ensure that K has an inverse, the determinant of K must be equal to one. The resulting encrypted message is then hidden in the image using the Least Significant Bit (LSB) technique. The designed application can be used to hide messages in digital images using the LSB technique and secure messages using the Hill Cipher cryptography method.