HKLM\SOFTWARE\Microsoft\MSMQ\Parameters\
The Security subkey contains subkeys that contain information about the computer account and about whether server authentication is used (secured communication between client and server).
Note
The entries in the subkeys under the HKLM\SOFTWARE\Microsoft\MSMQ\Parameters\CertificationAuthorities subkeys store actual certification authority (CA) certificates, not just pointers to entries in another location.
Caution
Do not change the values of entries in this subkey by editing the registry. Changing these values can disable the security features of Message Queuing.