When using Operations Manager (OpsMgr/SCOM) and want to see if there are updates on management packs, just check Download management packs > Add > Updates available for installed management packs. On a few management packs however the following error message was displayed:
<MP> did not pass the security verification. The management pack cannot be downloaded and the temporary file has been deleted. A few management packs I get this error are Hyper-V, Lync/Exchange and SQL server, but I guess there may be more.
The following must be done when having this error: Apparently Microsoft released a newer version, which can be downloaded straight from Microsoft, but not from within OpsMgr. After downloading and importing it no error message is displayed anymore. Too bad a few management packs cannot be downloaded right away at this moment, by probably Microsoft will fix it in future.
Source: https://social.technet.microsoft.com/forums/systemcenter/en-US/e97ba10e-563f-4d8c-bccd-799c0ceb4227/system-center-core-monitoring-reports-mp-verification-failed (old post from 2010 but still active)
Hope it helps!