Certify your PDFs with a Digital Signature
Acrobat makes digital signing easier than you might think. You can certify your PDFs using Acrobat's own self-sign feature, or using a third-party facility from another company.
To use the Self-Sign method (including generating a digital ID for the first time) follow these steps:
1. Choose Advanced-Security Settings then Add ID.
2. Choose the Self-Signed ID option.
3. Choose New PKCS#12 Digital ID file - this just means that you are going to create a certificate for use within Acrobat only.