Re-Key (a certificate) definition in Computer Security terms:
Definition(s): To change the value of a cryptographic key that is being used in a cryptographic system application; this normally entails issuing a new certificate on the new public key.
Source(s): NIST SP 800-32
The process of creating a new certificate with a new validity period, serial number, and public key while retaining all other Subscriber information in the original certificate.
Source(s): CNSSI 4009-2015 (CNSSI 1300)
reference: CSRC Glossary