KEK AND RSI RESYNCHRONIZATION
Original Publication Date: 1998-Mar-01
Included in the Prior Art Database: 2002-Jun-21
In APCO OTAR, the unique Key Encryption Key (UKEK) or Radio Set Identifier (RSI) that an individual unit has can become out of sync with the UKEK or RSI that the Key Management Facility (KMF) believes that the unit possesses. This scenario occurs when a radio has been successfully sent a new UKEK or RSI, but an OTAR acknowl- edgment to the rekey or change RSI command is not successfully received by the KMF. The acknowledgment coming back to the KMF can collide with other inbound traffic and be prevented from reaching the KMF.