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In WebSphere MQ, there are three methods of providing security:

1. The Object Authority Manager (OAM)
2. User-written, or third party, channel exists
3. Channel security using Secure Sockets Layer (SSL)

The Object Authority Manager (OAM): This is automatically installed and enabled for each queue manager you create, unless you specify otherwise. All actions performed by an application connected to a queue manager are authenticated by the queue manager by a component called OAM. Every time an application attempts any action against a WebSphere MQ object, the OAM ensures that the identity under which that application is connected to QM has been set to allow the type of access it is requesting on the object. Read more »