在ECB模式下可以使用AES和IV吗？ [英] Is it possible to use AES with an IV in ECB mode?

问题描述

从 http://php.net/manual/en/function。 mcrypt-encrypt.php ，我在ECB模式下使用AES看到了以下代码，使用AES，

From http://php.net/manual/en/function.mcrypt-encrypt.php, I saw the following codes using AES with an IV in ECB mode,

<?php
    $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
    $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
    $key = "This is a very secret key";
    $text = "Meet me at 11 o'clock behind the monument.";
    echo strlen($text) . "\n";

    $crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $text, MCRYPT_MODE_ECB, $iv);
    echo strlen($crypttext) . "\n";
?>

但是来自wiki http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation ，它表示ECB不需要IV。
在ECB模式下真的可以使用AES和IV吗？在这种ECB模式下，额外的IV将提供比不使用时更多的安全性。

But from wiki http://en.wikipedia.org/wiki/Block_cipher_modes_of_operation, it says ECB does not need an IV. Is it really possible to use AES with an IV in ECB mode? In this ECB mode, will the additional IV provide a little bit more security comparing to when it is not used?

推荐答案

ECB不执行块之间的链接，所以没有办法使用IV。 mcrypt对所有模块使用相同的APi。因为ECB模块具有定义为

ECB doesn't perform chaining between blocks so there is no way to use IV. mcrypt uses the same APi for all modules. The IV is simply ignored for ECB because the ECB module has following function defined as,

int _has_iv() { return 0; }

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