passphrases

!--Security is strengthened by employing a PBKDF2 key derivation function.However, the weak passphrases users typically employ are vulnerable to password cracking attack.

安全是利 en:PBKDF2 密钥导出函数 (en:key derivation function) 来增强，然而使者采典型弱密语会被密码解攻击。