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Kad 

Kad is a shortcut for Kademlia network which employs peers/clients as small "servers" and runs queries through these peers without any servers for storing files or user information.

 

Kernel

A kernel is the nucleus of a computer operating system, the core that provides basic services for all other parts of the operating system. See also Shell.

 

Keys

Keys are used like passwords to open and close (encrypt and decrypt) messages. While many encryption algorithms are commonly known and public, the key must be kept secret.

 

Key Management

Key Management allows you to determine whether to use IKE (ISAKMP) or manual key configuration in order to set up a VPN.

 

Keyword Blocking

Keyword blocking denies access to web sites with URLs that contain particular text that you specify.