Editing Trusted third party (section)

==An example==
Suppose Alice and Bob wish to communicate securely – they may choose to use [[cryptography]]. Without ever having met Bob, Alice may need to obtain a key to use to encrypt messages to him. In this case, a TTP is a third party who may have previously seen Bob (in person), or is otherwise willing to vouch for that ''this key'' (typically in a [[public key certificate]]) belongs to the person indicated in that certificate, in this case, Bob. Let's call this third person ''Trent''. Trent gives Bob's key to Alice, who then uses it to send secure messages to Bob. Alice can trust this key to be Bob's if she trusts Trent. In such discussions, it is simply assumed that she has valid reasons to do so (of course there is the issue of Alice and Bob being able to properly identify Trent as Trent and not someone impersonating Trent).