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Review SSL/TLS certificate fields and expiry dates with a browser-based educational checker.
This SSL certificate checker is an educational helper for reviewing certificate fields and expiry timing in the browser.
It is useful for understanding what certificate details mean, but it does not directly inspect live third-party certificates from the browser.
A plain-English explanation of SSL/TLS certificates, what they do, why expiry matters, and what a browser lock icon actually represents.
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Educational SSL/TLS Certificate Tool
Browsers cannot directly inspect SSL certificates of third-party domains due to security restrictions. This tool helps you understand certificate fields by letting you input certificate details manually and checking expiry calculations. To inspect real certificates, use your browser's built-in certificate viewer (click the lock icon in the address bar).
The fully qualified domain name the certificate is issued for.
The legal name of the organization that owns the certificate.
The department within the organization.
The Certificate Authority that issued the certificate.
The organization of the issuing Certificate Authority.
A unique identifier assigned by the CA to the certificate.
The start date of the certificate's validity period.
The expiration date of the certificate.
The algorithm used to sign the certificate.
The size of the public key in the certificate.
Additional domain names covered by this certificate.
SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) are cryptographic protocols that provide secure communication over a network. They encrypt data in transit between a web browser and a server, preventing eavesdropping and tampering.
1) Client Hello: Browser sends supported cipher suites. 2) Server Hello: Server selects cipher suite and sends its certificate. 3) Certificate Verification: Browser verifies the certificate chain. 4) Key Exchange: Both parties establish a shared session key. 5) Encrypted Communication: All data is encrypted with the session key.
SSL certificates form a chain of trust: Root CA (trusted by browsers) -> Intermediate CA -> End-entity certificate (your domain). Each certificate is signed by the one above it in the chain.
DV (Domain Validation): Basic, verifies domain ownership. OV (Organization Validation): Verifies organization identity. EV (Extended Validation): Highest level, requires extensive verification. Wildcard: Covers all subdomains (*.example.com). Multi-domain (SAN): Covers multiple different domains.