SECURITY RSA CRYPTOGRAPHY ALGORITHM AND IMAGE TRANSMISSION PROTOCOL

• Main Author: Simatupang, Frengki
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/72630
• Institution: Institut Teknologi Bandung

The internet is a medium of communication and data exchange in the form of text, images, audio and video. Easy access to information on the internet can lead to misuse by irresponsible people. Data security is an important aspect of data transfer via the internet, and information needs to be protected with integrity, confidentiality and availability. In this study, the authors developed a protocol program for safe satellite image delivery using the encryption and decryption method with the RSA algorithm. The RSA algorithm has a high level of security and is still relevant to image security. The security of the RSA algorithm lies in the difficulty of factoring two large numbers into prime factors. The satellite image transmission protocol is implemented by generating and exchanging keys, the encryption process, the digital signature creation process, the digital signature verification process, and the satellite image decryption process. The author has simulated the sending of satellite imagery up to a large size of up to 500 MB and tested the system's resilience by analyzing the encryption and decryption quality matrix. The results of the statistical Histogram analysis showed that the Histogram of the encrypted image was very different from the Histogram of the original and decrypted images. The results of the statistical analysis of entropy >= 7.6 are close to the ideal value H(RGB)=8. NPCR Differential Analysis >=99.27 %, UACI >=33.44 %. The value of the differential analysis corresponds to the ideal criteria for NPCR >= 99% and UACI >= 33%. The result of key sensitivity analysis is that every small change in the key causes a significant change in the encrypted or decrypted image. The results of the analysis MSE value is 0.0, and PSNR is 100 dB. Analysis of the execution time of encryption and decryption, size and resolution of satellite imagery is directly proportional to the execution time of encryption and decryption. The lowest encryption execution time is 0.1 minutes, and the lowest decryption execution time is 0.2 minutes; the satellite image size is 18 MB, and the resolution is 2100x1485 pixels. The highest execution time for encryption is 3.3 minutes, and the maximum execution time for the decryption process is 15.3 minutes; the satellite image size is 536 MB, and the resolution is 10051x9368 pixels. Based on the analysis of the encryption and decryption quality matrix, the proposed satellite image transmission protocol is efficient and safe from statistical, differential, brute force, and adaptive noise attacks.