With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cieEngineStatusTable
Cisco IP Encryption Engine Status Table
1.3.6.1.4.1.9.9.52.1.2.1
A table describing status of all encryption engines present within the router.
Back to CISCO-IP-ENCRYPTION-MIB MIB page.
IPHost Network monitor allows you to monitor cieEngineStatusTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.