What is role of COUNT Update in Authentication?
cdmaguru 14-May-2008 09:45:16 AM
Comments


CallHistoryCount is a 6-bit counter that is maintained in the MS and the AC. The COUNT value provided by the roaming MS is compared with the one maintained by the AC to determine whether they are consistent.
Posted by waqqas1


CallHistoryCount (COUNT): is a counter value maintained by the roaming MS, home AC, and, if local authentication is enabled, the visited VLR. It provides a mechanism for detecting cloned mobile stations, especially when SSD and/or A-key values have been compromised. The COUNT value provided by the roaming MS is compared with the one maintained by the AC to determine whether they are consistent. A mismatch suggests that a clone may exist but is not necessarily conclusive since RF transmission issues may result in occasional minor mismatches. However, there should not be large or frequent deltas between these values.
Posted by sagitraz


CallHistoryCount (COUNT) is a 6-bit counter that is maintained in the MS and the AC (counts from 0 to 63 then back to 0)
Posted by anders


Posted: 14-May-2008 11:48:48 AM By: anders

CallHistoryCount (COUNT) is a 6-bit counter that is maintained in the MS and the AC (counts from 0 to 63 then back to 0)

Posted: 14-May-2008 03:41:02 PM By: sagitraz

CallHistoryCount (COUNT): is a counter value maintained by the roaming MS, home AC, and, if local authentication is enabled, the visited VLR. It provides a mechanism for detecting cloned mobile stations, especially when SSD and/or A-key values have been compromised. The COUNT value provided by the roaming MS is compared with the one maintained by the AC to determine whether they are consistent. A mismatch suggests that a clone may exist but is not necessarily conclusive since RF transmission issues may result in occasional minor mismatches. However, there should not be large or frequent deltas between these values.

Posted: 30-December-2008 02:51:07 PM By: waqqas1

CallHistoryCount is a 6-bit counter that is maintained in the MS and the AC. The COUNT value provided by the roaming MS is compared with the one maintained by the AC to determine whether they are consistent.