IMPLEMENTASI TEKNIK KRIPTOGRAFI VISUAL PADA CITRA KEABUAN DAN BERWARNA UNTUK OTENTIKASI PENGGUNA PADA TRANSAKSI ONLINE

Visual cryptography (VC) technique encodes an image into two or more shares that appear random in human eyes. In the decryption section, pixels shared images are combined to obtain information contained original image. This study applies visual cryptographic techniques graysle and color for user authentication online transactions using VC2,2 scheme. The server computer CAPTCHA sent through different channels applications. To authenticate himself, performs XOR operation on both share images, identifies sends it server. encryption test, histogram of has a pattern from description test shows decrypted this visually better quality than binary images.