SSL 证书检查器
验证任何域名的 SSL/TLS 证书有效性、到期时间、颁发者和安全评级。
检查网站的 SSL 证书是否正确配置、有效且安全。我们的工具分析证书详情，包括颁发者信息、有效期、加密标准，并提供整体安全评级。
什么是 SSL/TLS？
SSL（安全套接层） and TLS（传输层安全） are cryptographic protocols designed to provide secure communication over a computer network. They are widely used on the Internet to protect the privacy and integrity of data exchanged between web browsers and servers.
为什么 SSL/TLS 很重要
- 数据加密： Encrypts data transmitted between the browser and server, preventing eavesdropping.
- 数据完整性： Ensures that data is not tampered with during transmission.
- 身份验证： Verifies the identity of the website, ensuring users are communicating with the legitimate server.
- 信任： Browsers display a padlock icon and HTTPS to indicate secure connections.
- SEO 优势： Search engines like Google prioritize HTTPS websites in search results.
了解 SSL 评级
SSL grades range from A+ to F, with A+ being the most secure and F being the least secure. The grade is based on various factors including:
- 证书有效期： Is the certificate current and not expired?
- 协议版本： Is the site using modern TLS protocols (TLS 1.2 or 1.3)?
- 加密强度： Are strong encryption algorithms being used?
- 证书链： Is the certificate chain properly configured?
- 漏洞： Are there known SSL/TLS vulnerabilities?
常见 SSL 问题
- 过期证书： The certificate has passed its validity period.
- 自签名证书： The certificate is not issued by a trusted Certificate Authority (CA).
- 域名不匹配： The certificate does not match the domain name.
- 弱加密： Using outdated or weak encryption algorithms.
- 缺少中间证书： Incomplete certificate chain.
如何修复 SSL 问题
- 续期过期证书： Contact your CA to renew expired certificates.
- 使用可信 CA： Obtain certificates from reputable Certificate Authorities like Let's Encrypt, DigiCert, or Comodo.
- 更新服务器配置： Enable modern TLS protocols and strong ciphers.
- 完整证书链： Ensure all intermediate certificates are properly installed.
- 使用证书管理工具： Automate certificate renewal with tools like Certbot or commercial solutions.