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使用自簽名證書有哪些潛在的安全威脅，以及何時可以考慮使用它們？

自簽名證書是由個人或組織自行創(chuàng)建和簽署的數(shù)字證書，而不是由受信任的第三方（如證書頒發(fā)機構CA）簽發(fā)。這種靈活性使得它們非常適合某些特定場景，但也帶來了若干安全隱患。

由于瀏覽器和其他應用程序默認不信任自簽名證書，用戶在訪問使用此類證書保護的網站時會收到警告消息，這可能會使用戶感到不安并導致他們放棄繼續(xù)瀏覽。

如果攻擊者能夠獲取到服務器私鑰并且能夠成功中間人攻擊受害者，那么該攻擊者就可以冒充合法網站并竊取敏感信息，因為客戶端無法驗證此證書是否來自可信賴來源。

何時可以考慮使用自簽名證書

盡管存在上述風險，在某些情況下使用自簽名證書仍然是合理的選擇：

1. 內部網絡：在一個完全可控且封閉的企業(yè)內部環(huán)境中，所有設備都由IT部門管理，可以通過配置讓每臺電腦都信任企業(yè)自己簽發(fā)的根證書。此時使用自簽名證書可以節(jié)省成本并且簡化部署流程。

2. 測試環(huán)境：當開發(fā)者需要快速搭建一個HTTPS服務來進行功能測試或者演示時，使用自簽名證書可以避免繁瑣的CA申請過程。

3. 個人項目：對于僅限于個人使用的網站或應用來說，例如家庭照片分享平臺、私人博客等，安全性要求相對較低，同時也不涉及大量用戶隱私數(shù)據(jù)傳輸?shù)那闆r下，采用自簽名證書是可行的。

是由情況下也不而不可以通過帶來了但也此類較低建站會使仍然是第三方這可都由不信任每臺就可以應用程序客戶端

2025-01-19

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