Secured communications in medical monitoring systems

A method comprising:

• receiving, by a first computing device from a medical sensor, a sensor secret value;
• receiving, by a first computing device from the medical sensor, a set of encrypted medical readings created using a first cryptographic operation on unencrypted medical readings based on a first key derived from the sensor secret value, wherein the cryptographic operation comprises performing add-rotate-xor operations on the unencrypted medical data;
• deriving, by the first computing device, the first key based on the sensor secret value;
• and
• decrypting, by the first computing device, the set of medical readings using the derived first key with the cryptographic operation.

A method for secured communication between a medical sensor and a computing device comprising:

• receiving, by the medical sensor, an activation signal from the computing device through a short-range communication protocol;
• in response to the activation signal, verifying one or more authentication values associated with the computing device;
• and
• upon successfully verifying the authentication values associated with the computing device, collecting, by the medical sensor, sensor information from a patient.