Cryptographic encryption mechanisms in the open source PostgreSQL server DBMS are discussed. Special high-level and low-level functions of symmetric encryption of the Pgcrypto module for ensuring information security of data are analyzed. The analysis of special functions of the third-party GPG program is performed, which allow performing asymmetric encryption in the PostgreSQL database server. A combined data encryption technology in database tables is proposed, using a hierarchy of keys (asymmetric and symmetric encryption) with a passphrase, which is also encrypted to ensure better protection of encrypted data. This technology is being tested on the example of developing a function for encrypting data, which is triggered by a trigger when inserting rows into a database table, and a data decryption function when reading encrypted data from a table.
key words: PostgreSQL database server, encryption and decryption functions.
