调试和发布模式下的AES加密问题 [英] AES encryption problem in Debug and Release mode

问题描述

我正在使用AES加密算法（Rijndael实现）。我正在使用MS Visual Studio 2008 IDE进行开发工作。在调试和发布模式下，我可能会看到一个奇怪的问题。当我在调试模式下加密字符串时，它与释放模式下生成的字节不同。但是幸运的是解密将得到相同的字符串。我在Mac中尝试过，它可以再生成一个字节序列，但能够正确解密所有字节序列。

I am using AES encryption algorithm (Rijndael implementation). I am using MS Visual Studio 2008 IDE for my development work. I could see a strange problem in my Debug and Release mode. When I encrypt a string in Debug mode it generates different bytes than Release mode. But fortunately decrypting will result same string. I have tried in Mac, it generates one more byte sequence but able to decrypt all byte sequences correctly.

此问题与加密算法或调试/发布设置有关吗？
是否有解决方案可以避免这种情况？

Is this problem related to encryption algorithm or Debug/Release settings? Is there any solution to avoid this?

关于
Devara Gudda

Regards Devara Gudda

推荐答案

AES是一个 block 密码。您可以使用它加密和解密128位固定大小的块。为了加密和解密更长的序列，您通常使用某种操作模式和某种填充方案，它们都可能通过IV（初始化向量）和填充而涉及一些随机数。在那些情况下，由于涉及的随机性，密文每次都会更长一些并且有所不同。实际上，同一封邮件会加密为不同的密文，这并不是一个坏特性。您甚至需要它来保护自己免受某些攻击。

AES is a block cipher. You can encrypt and decrypt blocks of a fixed size of 128 bits with it. To encrypt and decrypt longer sequences you typically use a certain "mode of operation" and a certain "padding scheme" which both might involve some randonmess via the IV (initialization vector) and padding. In those cases the cipher text will be a bit longer and different each time due to the "randomness" that is involved. Actually, it's not a bad property that the same message encrypts to different cipher texts. You even need this to protect yourself from certain attacks.

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