Multiple Digital Signature Integration in the University Data Backup Archive using Enhanced DLP-based Security Framework

The dependency of universities on information systems has emphasized the need for a secure archival mechanism for institutional data. This study covers the implementation of a repository for database backup of Bicol University using a multiple digital signatory framework using Enhanced Discrete Logarithm Problem (DLP). The method consolidates five security managers of Bicol University, each maintaining their own digital signatures. The backup activity covers hashing of the database files using SHA-512 and encrypts the result using an Enhanced DLP-based Cryptosystem to generate a consolidated digital signature. The verification process requires the participation of, but is not limited to, five (5) security managers to ensure integrity, authenticity, and non-repudiation of the backup file and the stored security stamp. The evaluation conducted showed consistent and validated generation of digital signatures and security stamps, reliable detection of file tampering, and integration of collaborative authorization of security managers, which establishes distributed accountability and operational trust. Further analysis of the algorithm showed no established patterns between the plaintext and ciphertext, manifesting a high level of security. The sensitivity test using the Avalanche Effect exposed no patterns between the ciphertext and the plaintext and key, manifesting encryption strength. This was further validated by the use of the Strict Avalanche Criterion (SAC), which also showed a higher level of security. However, complexity analysis disclosed that higher computing resources are necessary to effectively implement the system. Nonetheless, the study confirmed that the enhanced DLP-based multiple digital signature framework is cryptographically secured and provides a practical and scalable approach for securing institutional data.