A subway signal data encryption scheme based on blockchain

With the rapid development of rail transit in China, people usually choose to travel by subway, and the subway train system has become an urgent requirement for the advancement of rail transit. This article primarily focuses on the problem of the signal data of subway trains being easily attacked during communication with the central system and proposes a blockchain-based data encryption scheme. The scheme adopts a combination of on-chain and off-chain storage, which reduces the storage pressure of the blockchain. The blockchain is used to encrypt and store the communication data, which ensures data consistency and non-repudiation. At the same time, by employing identity-based proxy re-encryption algorithms, encrypted data is shared between two peer entities without providing valid information to third parties. This method safeguards data privacy and achieves secure data sharing.