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What is the process of two-way encryption of data in PostgreSQL database version 9.1 using built-in functions?

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Did you have a look at pgcrypto? – a_horse_with_no_name Jul 12 '12 at 10:22

PostgreSQL's built-in two-way encryption functions are documented here. The functions that come in the encrypt/decrypt pairs are the two-way encryption options.

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