时间戳如何帮助防止 Web 服务中的重放攻击 [英] How does Timestamp helps in preventing Replay Attacks in webservices

问题描述

我试图理解 Web 服务中请求标头中时间戳的概念，但不知何故仍然无法完全理解它是如何工作的.

I am trying to understand the concept of timestamps in request headers in web services but somehow still can't understand fully how it works.

如果有人能够解释时间戳在 Web 服务的请求和响应中的端到端使用，我将不胜感激.

I would appreciate it if someone can explain the end-to-end use of timestamps in request and response of web services.

这真的是防止重放攻击的万无一失的方法吗?

Is it really a foolproof method of preventing replay attacks?

推荐答案

一个时间戳本身是不够的，但通常它与散列机制相结合以保证值没有被篡改.

A timestamp by itself wouldn't be sufficient, but usually it is combined with a hashing mechanism to guarantee that the values haven't been tampered with.

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这个想法是客户端生成参数，并使用他们的私钥来散列参数.然后将 [hash + original values + public key] 与请求一起发送.服务器可以使用公钥查找私钥，并确保参数正确.

The idea is that the client generates the parameters, and uses their private key to hash the parameters. The [hash + original values + public key] are then sent with the request. The server can use the public key to look up the private key, and ensure that the parameters are correct.

使用时间戳和一些阈值来确保特定请求不能被多次使用.如果阈值很小(几百毫秒)，那么重放攻击几乎是不可能的.

The timestamp is used, along with some threshold, to ensure that particular request can't be used more than once. If the threshold is small (a few hundred milliseconds) then a replay attack is virtually impossible.

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