• SIVAKUMAR C
• Mrs. S. KALAIVANI

Block chain and quantum computing are hot subjects in today's scientific discourse, drawing interest from governments, industry stakeholders, and academics alike. In this correspondence, we discuss the dilemma about the use of block chain technology and the threat posed by quantum technology. The development of universal quantum computers has an impact on block chain security just like it does on any cryptographic product. We emphasize that, other from the uncertainty surrounding its immediacy, block chain is similar to other safe and robust systems in this sense. On this basis, we talk about the key components of the roadmap that the cryptography research community is now following to address the quantum problem, and we emphasize how these components should be appropriately incorporated into the design and execution of the block chain product lifecycle. Protocol for Block chain-based Authentication Using Block chain-Based Access Control (BAPC), which addresses the issue of a prolonged halt in satellite services due to user access authentication in a situation where satellites and ground users are often switched between. Initially, we present the bit coin technology and construct three steps in the authentication procedure. The security of authentication and the effectiveness of switching authentication methods are both improved by using monetary transactions as the certificate of authenticity. Using the Ethereal block chain as a prototype, experiments were conducted to test the PoST protocol's performance using the following four metrics: read latency, read throughput, transaction latency, and transaction throughput. According to read and transaction latency statistics, the simulation results made it clear how effective the proposed PoST protocol is at processing and confirming satellite transactions quickly. Also, based to criteria for accuracy, true positive rate (TPR), true negative rate (TNR), and security, the proposed PoST protocol is secure and effective in confirming satellite transactions. These results might influence actual efforts to create a new class of Block chain- based satellite constellation systems.

"BLOCK QUANTUM COMPUTING FOR SECURED SATELLITE COMMUNICATION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.10, Issue 3, page no.i9-i15, March-2023, Available :http://www.jetir.org/papers/JETIR2303802.pdf

"BLOCK QUANTUM COMPUTING FOR SECURED SATELLITE COMMUNICATION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.10, Issue 3, page no. ppi9-i15, March-2023, Available at : http://www.jetir.org/papers/JETIR2303802.pdf