什么时候CRC比MD5 / SHA1更适合使用？ [英] When is CRC more appropriate to use than MD5/SHA1?

问题描述

何时使用CRC进行错误检测与更现代的散列函数（如MD5或SHA1）相适应？前者在嵌入式硬件上更容易实现？

When is it appropriate to use CRC for error detection versus more modern hashing functions such as MD5 or SHA1? Is the former easier to implement on embedded hardware?

推荐答案

CRC可用于检测可能发生的数据中的随机错误，例如，来自网络干扰，线路噪声，失真等。

CRC works fine for detecting random errors in data that might occur, for example, from network interference, line noise, distortion, etc.

CRC在计算上比MD5或SHA1复杂得多。使用像MD5这样的散列函数对于随机错误检测可能是过度的。然而，对于任何类型的安全检查，使用CRC将比一个更复杂的散列函数（如MD5）安全得多。

CRC is computationally much less complex than MD5 or SHA1. Using a hash function like MD5 is probably overkill for random error detection. However, using CRC for any kind of security check would be much less secure than a more complex hashing function such as MD5.

是的，CRC更容易实现嵌入式硬件，您甚至可以在IC上获得不同的打包解决方案。

And yes, CRC is much easier to implement on embedded hardware, you can even get different packaged solutions for this on IC.

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