Imaged Based Authentication System dengan Reduced Difference Expansion

Authentication is an important step in a system. Text-based authentication alternative that currently widely used. However, text-based has the disadvantage of being ineffective when users have multiple accounts. This weakness can be overcome using image-based authentication. The implementation use Reduced Difference Expansion (RDE) steganography method. application authentication, utilizing images as media. RDE utilizes reduced pixel difference place to insert credential data. Testing image this study, average similarity 40 dB, indicating inserted with credentials and not high similarity. increases security from theft. character capacity accommodated 21,451 characters, large enough accommodate very sensitive changes, so there slight change image, causing used for