pki对称加密的性能差异是多少？ [英] What is the performance difference of pki to symmetric encryption?

问题描述

我们希望对我们的项目做一些沉重的安全性要求，我们需要做很多高性能的加密。

We are looking to do some heavy security requirements on our project, and we need to do a lot of encryption that is highly performant.

我认为我知道PKI比对称加密慢得多，但比较复杂，但是我找不到数字来支持我的感受。

I think that I know that PKI is much slower and more complex than symmetric encryption, but I can't find the numbers to back up my feelings.

推荐答案

是的，纯非对称加密比对称cyphers（如DES或AES）慢得多，这就是为什么真正的应用程序使用混合加密：昂贵的公钥操作仅用于加密（和交换）将用于加密真实消息的对称算法的加密密钥。

Yes, purely asymmetric encryption is much slower than symmetric cyphers (like DES or AES), which is why real applications use hybrid cryptography: the expensive public-key operations are performed only to encrypt (and exchange) an encryption key for the symmetric algorithm that is going to be used for encrypting the real message.

公钥加密解决的问题是没有共享的秘密。使用对称加密，您必须信任所有相关方才能保持密钥。这个问题应该是一个比性能更大的问题（可以用混合方法来缓解）

The problem that public-key cryptography solves is that there is no shared secret. With a symmetric encryption you have to trust all involved parties to keep the key secret. This issue should be a much bigger concern than performance (which can be mitigated with a hybrid approach)

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