Authentication of medical device computing systems by using metadata signature
Computer code embedded in an electronic component (e.g., a processor, a sensor, etc.) of a medical device, such as a dialysis machine, can be authenticated by comparing a metadata signature derived from the computer code of the electronic component to a key derived from a pre-authenticated code associated with the electronic component. The metadata signature can be derived by running an error-check/error-correct algorithm (e.g., SHA256) on the computer code of the electronic component. A use of the metadata signature enables detection of any unauthorized changes to the computer code as compared to the pre-authenticated code.
1. A computer-implemented method comprising:
requesting, by a security authentication engine (SAE) of a computing system and from an electronic component of the computing system, a metadata signature specific to the electronic component;
receiving, by the SAE, the metadata signature from the electronic component, the metadata signature being derived from an error-check/error-correct code paired with a computer code embedded in the electronic component;
encrypting, by the SAE, the metadata signature to generate a first encrypted metadata; and
determining, by the SAE, that the first encrypted metadata substantially matches a first key associated with the electronic component and stored in the SAE, and in response:
providing, by the SAE, the first key to the electronic component as a validation key to be used by the electronic component in communications with other electronic components of the computing system.
2. The method of claim 1 , wherein the first key is stored in a lookup table, the lookup table including a plurality of keys, each key of the plurality of keys being associated with a respective electronic component of the computing system.
3. The method of claim 1 , wherein the first key is part of a key pair associated with the electronic component, the key pair including a second key, and
wherein the SAE requests the metadata signature by sending a message that includes the second key to the electronic component.
4. The method of claim 3 , wherein the metadata signature is generated by decrypting the second key based on the computer code embedded in the electronic component.
5. The method of claim 1 , wherein the computing system includes a plurality of subsystems and the electronic component resides on a first subsystem of the plurality of subsystems, and
wherein the SAE requests the metadata signature in response to determining that the first subsystem is a valid subsystem of the computing system.
6. The method of claim 5 , wherein the determining that the first subsystem is a valid system comprises:
receiving, by the SAE and from the electronic component, a first identification data of the first subsystem;
encrypting, by the SAE, the first identification data to generate a first encrypted identification data; and
determining, by the SAE, that the first encrypted identification data is listed in a lookup table stored on the SAE, the lookup table including a plurality of encrypted identifications associated with the plurality of subsystems.
7. The method of claim 1 , wherein the metadata signature is a checksum obtained by running the error-check/error-correct code on the computer code embedded in the electronic component.
8. The method of claim 1 , wherein the first key is removed from the electronic component upon a shutdown or a reboot of the computing system.
9. The method of claim 1 , wherein the computing system is a peritoneal dialysis machine or a hemodialysis machine.
10. The method of claim 1 , further comprising determining, by the SAE, that the first encrypted metadata does not substantially match any key stored in a lookup table, and in response communicating with a central security system to verify whether an authorized change was made on the computer code of the electronic component.
11. The method of claim 10 , further comprising:
receiving a message from the central security system confirming that an authorized change was made on the computer code; and
storing a new key in the lookup table for the electronic component, the new key being generated based on the metadata signature.
12. A non-transitory, computer-readable medium storing one or more instructions executable by a computing system to perform operations comprising:
requesting, by a security authentication engine (SAE) of the computing system and from an electronic component of the computing system, a metadata signature specific to the electronic component;
receiving the metadata signature from the electronic component, the metadata signature being derived from an error-check/error-correct code paired with a computer code embedded in the electronic component;
encrypting the metadata signature to generate a first encrypted metadata; and
determining that the first encrypted metadata substantially matches a first key associated with the electronic component and stored in the SAE, and in response:
providing the first key to the electronic component as a validation key to be used by the electronic component in communications with other electronic components of the computing system.
13. The non-transitory, computer-readable medium of claim 12 , wherein the first key is stored in a lookup table, the lookup table including a plurality of keys, each key of the plurality of keys being associated with a respective electronic component of the computing system.
14. The non-transitory, computer-readable medium of claim 12 , wherein the first key is part of a key pair associated with the electronic component, the key pair including a second key, and
wherein the SAE requests the metadata signature by sending a message that includes the second key to the electronic component.
15. The non-transitory, computer-readable medium of claim 12 , wherein the computing system includes a plurality of subsystems and the electronic component resides on a first subsystem of the plurality of subsystems, and
wherein the SAE requests the metadata signature in response to determining that the first subsystem is a valid subsystem of the computing system.
16. The non-transitory, computer-readable medium of claim 15 , wherein the determining that the first subsystem is a valid system comprises:
receiving, from the electronic component, a first identification data of the first subsystem;
encrypting the first identification data to generate a first encrypted identification data; and
determining that the first encrypted identification data is listed in a lookup table stored on the SAE, the lookup table including a plurality of encrypted identifications associated with the plurality of subsystems.
17. A system, comprising:
a security authentication engine (SAE) comprising one or more field-programmable gate arrays (FPGA); and
a computer-readable storage device coupled to the SAE and having instructions stored thereon which, when executed by the SAE, cause the SAE to perform operations comprising:
requesting, from an electronic component of a computing system, a metadata signature specific to the electronic component;
receiving the metadata signature from the electronic component, the metadata signature being derived from an error-check/error-correct code paired with a computer code embedded in the electronic component;
encrypting the metadata signature to generate a first encrypted metadata; and
determining that the first encrypted metadata substantially matches a first key associated with the electronic component and stored in the SAE, and in response:
providing, by the SAE, the first key to the electronic component as a validation key to be used by the electronic component in communications with other electronic components of the computing system.
18. The system of claim 17 , wherein the first key is stored in a lookup table, the lookup table including a plurality of keys, each key of the plurality of keys being associated with a respective electronic component of the computing system.
19. The system of claim 17 , wherein the first key is part of a key pair associated with the electronic component, the key pair including a second key, and
wherein the SAE requests the metadata signature by sending a message that includes the second key to the electronic component.
20. The system of claim 17 , wherein the computing system includes a plurality of subsystems and the electronic component resides on a first subsystem of the plurality of subsystems, and
wherein the SAE requests the metadata signature in response to determining that the first subsystem is a valid subsystem of the computing system by:
receiving, from the electronic component, a first identification data of the first subsystem;
encrypting the first identification data to generate a first encrypted identification data; and
determining that the first encrypted identification data is listed in a lookup table stored on the SAE, the lookup table including a plurality of encrypted identifications associated with the plurality of subsystems.