PKI (Public Key Infrastructure)

What is PKI

PKI (Public Key Infrastructure) is a set of policies, procedures, software and hardware tools for managing digital certificates and cryptographic keys. PKI underlies many information security mechanisms: electronic signatures, data encryption, authentication, secure email and HTTPS. The basis of PKI is asymmetric cryptography, where each participant possesses a pair of keys — public and private. In Russia, PKI is closely linked to the use of certified cryptographic information protection tools (SKZI/CIPF) and is the foundation for secure electronic document management (EDM).

The history of PKI dates back to the 1970s, when the first public key cryptographic systems were developed. However, PKI became widespread in the 1990s with the development of the internet and e-commerce. Today, PKI is an integral part of any modern IT infrastructure, providing trust in the digital world.

In Russia, PKI has been actively developing since the early 2000s, when the electronic signature law was adopted and the first certification authorities were established. Today PKI is used in all spheres: from banking operations to government services, ensuring the legal validity of electronic documents and the security of transactions.

PKI components

PKI includes a certification authority (CA) that issues and manages certificates; a registration authority (RA) that verifies the identity of the applicant; a repository — a storage of certificates and revocation lists; and end entities — users, servers, devices. In a corporate environment, PKI integrates with Active Directory through certificate services (AD CS), which allows automating the issuance of certificates. VPN, also built on PKI, is often used for secure data transfer between network segments.

Modern PKI solutions also include Certificate Lifecycle Management systems that automate the processes of issuing, renewing, revoking and archiving certificates. This is especially important for large organizations with thousands of users and devices, where manual certificate management becomes impossible.

In addition, PKI includes hardware security modules (HSM) — devices for secure storage of private keys and cryptographic operations. HSM provide protection against physical and software hacking, which is critical for government systems and financial organizations.

Application of PKI in Russia

PKI is used for SSL/TLS, electronic signatures, network authentication, email encryption and VPN. In Russia, PKI must use certified CIPF tools that comply with the requirements of the FSB of Russia. Designing a PKI infrastructure requires knowledge of cryptography and regulatory requirements. The design service helps design a reliable PKI architecture. The full list of protection measures is available in the technologies section.

In recent years, import substitution in the field of PKI has been actively developing in Russia. Domestic certification authorities are being created, own cryptographic algorithms are being developed (GOST R 34.10-2012, GOST R 34.11-2012), and certified hardware key storage devices (tokens, smart cards) are being produced. This makes it possible to ensure technological independence and information security under sanctions restrictions.

PKI is also the basis for the system of interdepartmental electronic interaction (SMEV), which ensures data exchange between government bodies. Without PKI, it would be impossible to implement the electronic government, the Gosuslugi portal and other key digital services.

Advantages and challenges of PKI

Implementing PKI gives organizations a number of advantages: ensuring confidentiality and integrity of data; legal validity of electronic documents; centralized access management; compliance with regulatory requirements.

However, PKI also faces challenges: the complexity of managing a large number of certificates; the need to ensure the security of private keys; the risk of compromise of the certification authority; the high cost of implementation and support.

To overcome these challenges, modern approaches are used: automation of certificate management, use of HSM, regular security audits and multi-factor authentication. This allows building reliable and scalable PKI infrastructures that meet the highest requirements.