Rekeying normally refers to the ability to change a lock so that a different key may operate it. Rekeying is done when a lock owner may be concerned that unauthorized persons have keys to the lock, so the lock may be altered by a locksmith so that only new keys will work.

Batch rekeying for secure group communications
Optimizing Rekeying Cost for Contributory Group Key Agreement Schemes
S2RP: a Secure and Scalable Rekeying Protocol for Wireless Sensor Networks
A Key Distribution and Rekeying Framework with Totally Ordered Multicast Protocols
Comparison of inter-area rekeying algorithms for secure wireless group communications
Secure Group Communication with Self-healing and Rekeying in Wireless Sensor Networks
Secure Group Communication with Self-healing and Rekeying in Wireless Sensor Networks
METHODS AND APPARATUS FOR DYNAMIC SESSION KEY GENERATION ANDREKEYING IN MOBILE IP
METHODS AND APPARATUS FOR DYNAMIC SESSION KEY GENERATION AND REKEYING IN MOBILE IP
A Scalable and Reliable Key Distribution Protocol for Multicast Group Rekeying