Spatiotemporal Information-Based Authorization Method for UOF Documents

With the continuous development of data encryption technology, document encryption technology, as an important branch of data encryption technology, attracts more and more attention. However, in some specific environments, there are requirements for the operating time and location of documents, so a unified authorization method is needed. This paper proposes a document security authorization solution based on spatiotemporal information for the UOF documents. Based on data encryption technology, MCU, communication, and encryption algorithms are used to meet the functional requirements of document encryption and transmission. This technology is developed based on ATmega328P chip, uses ATGM336H to obtain spatio-temporal information, encapsulates the two into a physical module as a spatio-temporal authorization module, and uses RSA and AES256 algorithms to encrypt and decrypt documents, ensuring the security of document transmission. The case demonstrates the process and effect of encryption and decryption. Compared with the traditional plaintext transmission method, this method improves the security of physical file transmission, uses spatiotemporal information as part of the generated key, realizes the unforgeability of the key during the decryption process, and meets the functional requirements of limiting time and space.