How does my private key help me send a file?
note
You do not have to perform anything in the front end; the following process happens in under 0.1ms automatically.
Sending a file requires the fingerprint of your key and your private key blended. 
fingerprint + private key =  digital signature
Once the digital signature is generated it is sent to the other end.
info
- You cannot perform anything in the system without your 
private key. - The 
private keyis only known to you.