PHP：最安全（可解密）的加密方式？ [英] PHP: Most secure (decryptable) encryption method?

问题描述

在PHP中，哪个（可解密）加密算法是最安全的？

我的意思是MD5无法解密？

I已经找到了具有mcrypt的完整工作类（然后再次使用base64编码），可以加密和解密回来。

In PHP, which (decryptable) encryption algorithm is most secure one?
I mean MD5 can't be decrypted back right?
I've found full working class with mcrypt (then encoded with base64 again) which can encrypt and decrypt back.

示例mcrypt加密）：

Sample mcrypt (Encrypt):

function encrypt($value) {
    if(!$value){return false;}
    $text = $value;
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->key, $text, MCRYPT_MODE_ECB, $iv);
    return trim($this->safe_b64encode($crypttext));
}

然后用base64重新编码：

Then encode again with base64:

function safe_b64encode($string) {
    $data = base64_encode($string);
    $data = str_replace(array('+','/','='),array('-','_',''),$data);
    return $data;
}

（对不起，代码只是加密，没有解密，我只是给
但是我只想知道是否还有其他更安全的算法，然后使用mcrypt。

(Sorry for the code just with the encrypt, without decrypt. I just giving sample.) But I just want to know if there other more secure algorithm then using mcrypt.

推荐答案

你可能想要MCRYPT_RIJNDAEL_256。具有128,192和256位的块的Rijndael是AES的一般化，它仅支持128位的块大小。

You probably want MCRYPT_RIJNDAEL_256. Rijndael with blocksizes of 128, 192 and 256 bit is a generalization of AES which only supports a blocksize of 128 bit.

请参见： http://us.php.net/manual/en/mcrypt.ciphers.php 和 http://us.php.net/manual/en/book.mcrypt.php

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