What is kinit kerberos ‘How to install kinit kerberos protocol’  

The ‘kinit’ command obtains or renews a Kerberos ticket-granting ticket. The protocol was named after the character Kerberos or Cerberus, the ferocious three-headed guard dog of Hades. It developed primarily at a client–server model and it provides mutual authentication from both the user and the server then verify each other’s identity. Kerberos protocol messages are protected against eavesdropping and replay attacks.
Kinit Kerberos is a computer-network authentication protocol, Kerberos uses UDP port 88 by default. kerberos allows nodes to communicate over a non-secure network to prove their identity to one another in a secure manner. 
Kerberos builds on symmetric key cryptography and requires a trusted third party, and optionally may use public-key cryptography during certain phases of authentication. 
‘How to install Kinit Kerberos on linux cent OS’

If the Kinit Kerberos is not install on your computer it will show ‘kinit command not found’ to resolve this issue you may run :-  
# yum install krb5-workstation

this will solve ‘kinit kerberos protocol install command not found’

kinit -f user@example.com

after this enter password.

and run  scp -r user@example.com:/test/data/file  /home/user