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The SSL Checker Tool is an online utility that allows you to analyze and assess the security and validity of SSL/TLS certificates used by websites. SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) are cryptographic protocols that provide secure communication over the internet.
The SSL Checker Tool performs a variety of checks on SSL certificates to ensure they are properly configured and functioning correctly. Here is a description of some of the key features and functions of the tool:
Certificate Information: The tool displays essential information about the SSL certificate, such as the certificate issuer, subject, expiration date, and the certificate's cryptographic strength.
Certificate Chain: It verifies the certificate chain, which includes the SSL certificate, intermediate certificates, and the root certificate. This ensures that the certificate is trusted and has not been tampered with.
Validity and Expiration: The tool checks the validity and expiration date of the certificate. It alerts you if the certificate has expired or is nearing expiration, as an expired certificate can compromise the security of your website.
Certificate Authority (CA): It verifies the issuing Certificate Authority (CA) and checks if it is trusted by major web browsers. This helps determine if the certificate is from a reputable source.
Cipher Suite Analysis: The tool examines the cipher suites supported by the server to ensure that they are secure and using up-to-date cryptographic algorithms.
Vulnerability Detection: It scans for potential vulnerabilities or weaknesses in the SSL configuration, such as outdated protocols or weak encryption algorithms that could be exploited by attackers.
Mixed Content Analysis: The tool checks for any mixed content issues, where a webpage is served over HTTPS but contains insecure content (e.g., images, scripts) from non-HTTPS sources. Mixed content can affect the overall security of a website.
SSL/TLS Version Detection: It identifies the SSL/TLS protocol version used by the server, ensuring that it is using the latest and most secure version.
Revocation Status: The tool checks if the certificate has been revoked by the issuing CA. Revoked certificates are no longer considered trustworthy and should not be used.
Overall, the SSL Checker Tool provides a comprehensive assessment of the SSL certificate's security, configuration, and validity. It helps website owners and administrators ensure that their websites are properly secured, protecting sensitive information and providing a safe browsing experience for their users.