13.2.2.3. Create a Digital Signature
RPM 4.1 and later revisions place more importance on signing your packages. The rpm command will, by default, verify signatures on each package it reads.
Therefore, you should create a digital signature for your packages, if only to meet user expectations. In addition, you should place a copy of your digital signature on your organization’s Web site and public key servers. Having multiple copies in multiple locations helps prevent malicious users from impersonating your keys.
Cross Reference