Let's build an extension to encrypt and decrypt messages with the Linux McRypt library.
让我们构建一个扩展来用Linux mcrypt库加密和解密消息。
OpenSSL is the cryptography library used for SSL communications, and is required by mod_ssl to encrypt HTTP traffic for Apache.
OpenSSL是用于ssl通信的密码方法库，并且被mod_ssl用来对Apache的HTTP通信进行加密。
You can use functions from pgcrypto library to encrypt / decrypt columns.
可以使用 pgcrypto 库中的函数对列进行加密/解密。
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