How to use private key

In my search i found out that we can generate private key called myrsakey.pem.What is the purpose of this key where this key is used.Help me.

Rega开发者_运维知识库rds Sharun.

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Hi i want to use myrsakey.pem in my java program for authentication

Why? If you don't know how? Where did this requirement come from?

Ask for clarification. Are they talking about digital signatures for example? or X.509?

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It is a key used to perform RSA encryption. See http://en.wikipedia.org/wiki/RSA