Secure networked respiratory therapy systems

A control device configured to communicate wirelessly with a respiratory therapy device, the control device comprising:

• a memory storing processing instructions;
• and
• a processor configured to:
• establish an insecure wireless communication channel with the respiratory therapy device;
• obtain a first shared secret via a different channel than the insecure wireless communication channel, the first shared secret being known to the respiratory therapy device;
• receive a public key from the respiratory therapy device via the insecure wireless communication channel;
• and
• compute a second shared secret using the first shared secret and the public key, the second shared secret being known to the respiratory therapy device and being stronger than the first shared secret.

A method of conducting wireless communications between a respiratory therapy device and a control device, the method comprising:

• establishing, by the respiratory therapy device, an insecure wireless communication channel with the control device;
• receiving, by the respiratory therapy device, a public key from the control device via the insecure wireless communication channel;
• computing, by the respiratory therapy device, a second shared secret using a first shared secret and the public key, the first shared secret and the second shared secret being known to the control device, the second shared secret being stronger than the first shared secret;
• and
• conducting, by the respiratory therapy device, wireless communications with the control device based on the second shared secret.

A respiratory therapy device configured to communicate wirelessly with a control device, the respiratory therapy device comprising:

• a memory storing processing instructions;
• and
• a controller configured to:
• establish an insecure wireless communication channel with the control device;
• receive a public key from the control device via the insecure wireless communication channel;
• and
• compute a second shared secret using a first shared secret and the public key, the first shared secret and the second shared secret being known to the control device, the second shared secret being stronger than the first shared secret.

A respiratory therapy system comprising:

• a respiratory therapy device;
• and
• a control device configured to communicate wirelessly with the respiratory therapy device;
• wherein the control device comprises a processor configured to:
• establish an insecure wireless communication channel with the respiratory therapy device;
• obtain a first shared secret via a different channel than the insecure wireless communication channel, the first shared secret being known to the respiratory therapy device;
• receive a public key from the respiratory therapy device via the insecure wireless communication channel;
• compute a second shared secret using the first shared secret and the public key, the second shared secret being known to the respiratory therapy device and being stronger than the first shared secret, and
• conduct wireless communications with the respiratory therapy device based on the second shared secret.