The paper examines the state and prospects of ensuring the security of electronic document flow in criminal proceedings in the context of the digital transformation of law enforcement agencies. First, threats to information security are characterized. The regulatory framework for ensuring safety has been defined, and attention has been given to organizational issues. It is stated that organizational means of ensuring security include the definition and regulatory consolidation of the circle of persons allowed to work with electronic document flow, as well as the prevention of the impact on information by other persons and phenomena. The technical means of ensuring the security of electronic document management are examined in detail, including hardware and software, hardware and cryptographic means of protection. The following are highlighted as prospects for the near future: more active use of cloud services and blockchain technology for information security, as well as promising quantum technologies of cryptography and quantum information transfer. As a conclusion, it is stated that only in the system all measures to ensure the security of electronic document flow in criminal proceedings can provide a synergistic effect that guarantees the security of information.