Topic protection policy for publish-subscribe messaging system

A computer system for securing a message published to a topic by a publisher and accessed by a subscriber in a publish-subscriber messaging system with a topic policy for the topic, the computer system comprising:

• one or more processors, one or more computer-readable memories, one or more computer-readable tangible storage devices, and program instructions stored on at least one of the one or more storage devices for execution by at least one of the one or more processors via at least one of the one or more memories, the program instructions comprising:
• program instructions to establish a topic policy for a topic;
• program instructions to associate a message published to the topic with the topic policy established for the topic;
• program instructions to sign a message published to the topic by a publisher with an encryption key of the publisher if directed by the topic policy established for the topic;
• program instructions to provide an encryption key of a subscriber to the topic if the topic policy established for the topic directs that the subscriber receive a message published to the topic in encrypted form;
• and
• program instructions to encrypt a message published to the topic for a subscriber specified in a topic policy established for the topic to receive the message in encrypted form.

A computer program product for securing a message published to a topic by a publisher and accessed by a subscriber in a publish-subscriber messaging system with a topic policy for the topic, the computer program product comprising:

• one or more computer-readable storage devices and program instructions stored on at least one of the one or more tangible storage devices, the program instructions comprising:
• program instructions to establish a topic policy for a topic;
• program instructions to associate a message published to the topic with the topic policy established for the topic;
• program instructions to sign a message published to the topic by a publisher with an encryption key of the publisher if directed by the topic policy established for the topic;
• program instructions to provide an encryption key of a subscriber to the topic if the topic policy established for the topic directs that the subscriber receive a message published to the topic in encrypted form;
• and
• program instructions to encrypt a message published to the topic for a subscriber specified in a topic policy established for the topic to receive the message in encrypted form.