Implementation of LSB-RSA Algorithm for the Authenticity of the JPG File Certificate

In an institution, the issue of a certificate document cannot be separated. Now, the development of technology makes certificate documents not only issued in paper form but can also be published online. The document must have security to prove its authenticity. If the document of the paper certificate there is a serial number or unique code to prove its authenticity, online certificate documents must also have a unique code to prove their authenticity. In this study, the LSB and RSA methods are used to prove the authenticity of the certificate. The secret message on the certificate document will be encrypted using the RSA algorithm. Encrypted messages will be entered into digital images using the LSB method. The results are represented in measurements, MSE (Mean Square Error), PSNR (Peak Signal to Noise Ratio), and BER (Bit Error Ratio). The combination of algorithms in this study produced very good values, the average PSNR value reached 73,4252 dB and an average value of BER equal to 1.4939.