Encrypted e-archives and secure delivery via electronic ledger

Digital document security in modern organizations represents one of the key challenges, particularly in the context of electronic archives and centralized document management systems. This paper proposes a model that enables client-side encryption of confidential documents, secure server-side storage, and controlled and auditable distribution through an electronic ledger system. Special emphasis is placed on modern cryptographic techniques, including hybrid encryption (AES and RSA/ECC), digital signatures, and blockchain technology for immutable audit logs. The model additionally considers postquantum cryptographic schemes to ensure long-term resistance to quantum attacks. The proposed architecture aims to ensure a high level of confidentiality, integrity, and availability, even in resource-constrained environments, and can be applied across diverse organizational and legal frameworks.