Certificates

Public key certificate - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Public_key_certificate

Certificate Signing Request (CSR)

Certificate signing request - Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Certificate_signing_request

How To Generate SSL Key, CSR and Self Signed Certificate For Apache
http://www.thegeekstuff.com/2009/07/linux-apache-mod-ssl-generate-key-csr-crt-file/

# openssl req -new -key www.thegeekstuff.com.key -out www.thegeekstuff.com.csr

Setting-up a Simple CA Using the strongSwan PKI Tool - SimpleCA - strongSwan - strongSwan
http://wiki.strongswan.org/projects/strongswan/wiki/SimpleCA


The Most Common OpenSSL Commands
http://www.sslshopper.com/article-most-common-openssl-commands.html