CRT is a file extension for a digital certificate file used with a web browser. CRT files are used to verify a secure website's authenticity, distributed by certificate authority (CA) companies such as GlobalSign, VeriSign and Thawte. CRT files allow a web browser to connect securely using the Secure Sockets Layer protocol. CRT files can be viewed by clicking the lock icon within your web browser.
MIME type: application/x-x509-ca-cert, application/pkix-cert, application/keychain_access, application/x-x509-user-cert
Learn more about .CRT files:
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Visit the VeriSign web page.
Learn about Security Certificates at ITKnowledgeExchange.com.