LTV-Backed E-Signatures Using Post-Quantum Cryptography

Due to concerns over the evolving quantum computing scenario and its potential threat to existing cryptosystems, including Public-Key Infrastructure (PKI) used in electronic signatures, there is a need to enhance the eSign components with quantum-resistant algorithms. One such algorithm is CrystalsDilithium, based on lattice cryptography, which can perform PKI operations in the eSign system. In addition to being resistant to quantum attacks, Long-Term Validation (LTV) is also utilized to ensure the validity of a document for an extended period. This is achieved by referring to PAdES/CAdES profiles and a time stamping service, which provides an accurate and trustworthy record of when a particular electronic document, file, or transaction was created, modified, or sent. Given the significance of eSign as a crucial digital service worldwide, migrating to post-quantum components will strengthen the system’s security. Therefore, the proposed research provides implementation, analysis and experimentation to ensure the eSign system components are robust against quantum computing threats.