.CSR File Extension

File created as a signing request for a digital certificate; contains an encrypted block of text that identifies the applicant of the certificate; includes encrypted data for country, state, organization, domain, email address, and public key; used by a Certificate Authority to establish proof of identity for Web sites.

CSR files are generated using a public and private key. The public key is included in the CSR file, and the private key is used to digitally sign the CSR file.