Web of Trust
- The node labeled "YOU" is your own generated key , so the Ownertrust value is " ultimate trust "
- This user specified that it always trusts the following users to sign other keys : d ,e , f , l .
- This user partially trusts the following users to sign other keys :a ,b.
- We let PGP assume that two partially trusted signatures sufficient certify a key ,so user h is deemed legitimate by PGP .
- A key is determined to be legitimate ,because it's signed by one fully trusted or two partially trusted , but its user may not be trusted to signed other keys .so PGP doesn't make r 's key legitimate even if r 's key is signed by legitimate n .