An excessive amount of "Failed to decrypt" errors are reported in the RHEV engine logs

Issue

Various types of "Failed to decrypt" errors are reported in the engine logs at quite an excessive rate, e.g. approximately one per second:

2013-05-10 00:37:58,508 ERROR [org.ovirt.engine.core.engineencryptutils.EncryptionUtils] (QuartzScheduler_Worker-84) Failed to decrypt Data must not be longer than 128 bytes
2013-05-10 00:03:08,898 ERROR [org.ovirt.engine.core.engineencryptutils.EncryptionUtils] (QuartzScheduler_Worker-85) Failed to decrypt Message is larger than modulus
2013-05-10 00:15:52,904 ERROR [org.ovirt.engine.core.engineencryptutils.EncryptionUtils] (QuartzScheduler_Worker-63) Failed to decrypt java.lang.NullPointerException
2013-05-10 00:26:21,956 ERROR [org.ovirt.engine.core.engineencryptutils.EncryptionUtils] (QuartzScheduler_Worker-72) Failed to decrypt java.lang.ArrayIndexOutOfBoundsException