How is your signature protected on adobe reader when sending documents?

How is your signature protected on adobe reader when sending documents?

It isn't signing in. I hope someone can explain this better than me but it goes something like this.
To sign you make a certificate. Either you buy the certificate from a trusted source, or you make a special public certificate, and send that to all your contacts. This sending is special - you can't just email it, because it could be a fake. People need to know it's real, perhaps by arrangement.
Anyway, people are now set to look at a PDF which says YOU signed it. They can check if the certificate you used matches the public certificate you sent. If it does, the file is unaltered. If it doesn't it is a fake. Plus, there is a third case - it might be your real signature then someone changed the PDF. But thanks to the certificate, when you validate you are told about that too.
Certificates, the law, signing and that area are complex, and you need to understand before you start. It's easy to make worthless signed documents.
By the way, I've no idea if any of this clever stuff works on iOS!!

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