Commitment Based Identity-Based Homomorphic Signatures for E-Document

Multi-key Homomorphic Signatures (HS) preserve the integrity of data during computations over private inputs from multiple parties. This paper introduces module variants of the Shortest Integer Solution (MSIS)-based Commitment Identity-based Homomorphic Signatures (CIBHS) to address the growing need for secure, efficient, and scalable HS for e-documents. Our proposed CIBHS scheme enables the verification of signatures from multiple identities (A, B, C) without accessing the original data, ensuring homomorphism in keys and messages. This promotes confidentiality and collaboration in e-document environments. The scheme streamlines transaction verification by allowing efficient combined signature validation without revealing individual inputs. The construction of the CIBHS framework is built upon Buvana et al. [1] and includes three phases: Registration, Form Completion, and Verification executed through seven key algorithms: KeyGen, KeyExt, Commit, Sign, Open, Eval, and Verify. These contributions significantly advance signature schemes, providing practical and robust solutions for maintaining data integrity and confidentiality in collaborative e-document workflows.