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In this post we will discus a little about server certificate model. Yes you are right we will discus here something about CA certificates and SSL. So lets start from CA certificate. Full form of CA is certificate authority or certification authority its main task is to provide digital signatures which are known as CA certificates. The digital signatures/certificates certifies the ownership of a public key. There are several CA that provide digital certificates some are free while some are paid. The very common use of CA certificates can be found in SSL or TSL. The introduction of SSL in HTTP protocol has made possible data transfer via network in encrypted form. Due to introduction of SSL in HTTP the three way handshake is also slightly affected to support data transfer in encrypted form.