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File Extension

CRT File Format

Certificate file

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:

SearchSecurity.com has collected news and learning resources about digital certificates.

Visit the VeriSign web page.

Learn about Security Certificates at ITKnowledgeExchange.com.

This was last updated in September 2010
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could not download either McAfee by AT&T website nor Norton 360 by CD. The Norton install screen does not come up. Is it caused by the same thing?
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