OPTAGE Inc., Toshiba Digital Solutions Corporationそして Fortinet Japan, LLC have successfully demonstrated communications with enhanced security and availability by building a quantum-resistant and redundant site-to-site VPN by combining Quantum Key Distribution and Post Quantum Cryptography.
This proof-of-concept experiment also confirmed that quantum secure data communication can be performed by applying the QKD system to a closed network using OPTAGE’s own lines in the node operation of the public blockchain in オプテージ‘s Web3 business.
It has been pointed out that the encryption keys currently in widespread use in encrypted communications may be decrypted with the advent of quantum computers. Introducing QKD and PQC as countermeasures against quantum computers has the advantage of protecting data communication infrastructure from the threat of cyber attacks and allowing data to be used safely. However, although the security of QKD has been proven from an information theoretical perspective, it is a system that shares encryption keys using optical fibers, just like regular optical communications. Therefore, unless multiple communication paths are prepared, there are problems such as the inability to share encryption keys due to continuous attacks. In addition, the security of PQC depends on the computational power and decryption algorithms of currently assumed quantum computers, so security cannot be guaranteed indefinitely by PQC alone.
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Additionally, the spread of Web3, which uses blockchain as its base technology, is expected in various fields such as finance and NFT. While blockchain guarantees the integrity, authenticity, and immutability of data through encryption technology, digital signatures, and hash functions, the practical operation of blockchain nodes requires not only public information such as transaction history belonging to the blockchain, but also communication between locations and remote storage of highly confidential confidential data.
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