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GnuPG/KGpg Sign PGP Key – Sign User ID : What is the difference?

Çağlar Arlı      -    20 Views

GnuPG/KGpg Sign PGP Key – Sign User ID : What is the difference?

What is the difference between signing a user ID and a whole Key? Which behavior is the best as to signing user IDs and Keys? How and when to use "Local signatures" (non-exportable)?

(I was told not to sign any keys except for people I really know. However, I can trust some people without knowing them in real life.)

My system seems to only fully accept keys I signed myself, otherwise it displays a warning that the public key validity is unknown. The keys are imported from servers and multiply signed by other people.