Sensor with signature of data relating to sensor
First Claim
Patent Images
1. A method, comprising:
- sorting data related to a pulse oximeter sensor into first data to be signed, second data to be masked, and third data to be clear data using one or more processors;
producing a digest with the one or more processors, wherein the digest is produced as an output of a hash function applied to at least one of the first data, the second data, and the third data;
signing the digest and the first data along with formatting data to produce a digital signature with the one or more processors;
masking the second data to produce masked data; and
storing the digital signature, the masked data, and the third data in a memory associated with the pulse oximeter sensor to facilitate controlling cooperation of the pulse oximeter sensor with a pulse oximeter monitor.
1 Assignment
0 Petitions
Accused Products
Abstract
A sensor has codes useful for a monitor which can be authenticated as accurate. The sensor produces a signal corresponding to a measured physiological characteristic and provides codes which can be assured of being accurate and authentic when used by a monitor. A memory associated with the sensor stores both data relating to the sensor and a digital signature. The digital signature authenticates the quality of the code by ensuring it was generated by an entity having predetermined quality controls, and ensure the code is accurate.
56 Citations
17 Claims
-
1. A method, comprising:
-
sorting data related to a pulse oximeter sensor into first data to be signed, second data to be masked, and third data to be clear data using one or more processors; producing a digest with the one or more processors, wherein the digest is produced as an output of a hash function applied to at least one of the first data, the second data, and the third data; signing the digest and the first data along with formatting data to produce a digital signature with the one or more processors; masking the second data to produce masked data; and storing the digital signature, the masked data, and the third data in a memory associated with the pulse oximeter sensor to facilitate controlling cooperation of the pulse oximeter sensor with a pulse oximeter monitor. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method comprising:
-
retrieving data from a memory associated with a pulse oximeter sensor to facilitate controlling cooperation of the pulse oximeter sensor with a pulse oximeter monitor, wherein the data comprises a digital signature, masked data, and unmasked data, and wherein the digital signature comprises a digest and signed data; decrypting the digest and the signed data from the digital signature; creating a secondary digest from the first data obtained from the signed data, second data obtained from the masked data, and unmasked data; comparing the digest and the secondary digest to determine whether errors have been introduced; and blocking operation of the oximeter monitor with the pulse oximeter sensor when comparison of the digest and the secondary digest indicates errors have been introduced.
-
-
8. A pulse oximeter apparatus, comprising:
-
an input configured to receive data from a pulse oximeter sensor memory, the data including a digital signature, masked data, and clear data; a processor of the pulse oximeter apparatus configured to; decrypt the digital signature to obtain a first set of data and a digest using a cryptographic transform and a public key; determine a symmetric key for the masked data using the digest; decrypt the masked data with the symmetric key to obtain a second set of data; create a secondary digest from at least one of the first set of data, the second set of data, and the clear data using a hash function; and compare the secondary digest to the digest and authenticate the pulse oximeter sensor or provide an indication of defectiveness based on whether the secondary digest and the digest sufficiently match. - View Dependent Claims (9, 10, 11, 12)
-
-
13. A method, comprising:
-
producing a digest from at least first data with one or more processors; signing the digest and the first data along with formatting data to produce a digital signature with the one or more processors; masking second data to produce masked data with the one or more processors; and storing the digital signature, and the masked data in a memory associated with a pulse oximeter sensor. - View Dependent Claims (14, 15)
-
-
16. A method, comprising:
-
retrieving data with a pulse oximeter apparatus processor from a memory associated with a pulse oximeter sensor, wherein the data comprises a digital signature and masked data, and wherein the digital signature comprises a digest and signed data;
decrypting the digital signature with a pulse oximeter apparatus processor to obtain first data from the signed data and the digest using a cryptographic transform and a public key;determining, with the pulse oximeter apparatus processor, a symmetric key for the masked data using the digest; decrypting, with the pulse oximeter apparatus processor, the masked data with the symmetric key to obtain second data; creating, with the pulse oximeter apparatus processor, a secondary digest from at least the first data using a hash function; and comparing, with the pulse oximeter apparatus processor, the secondary digest to the digest and authenticating the pulse oximeter sensor or providing an indication of defectiveness based on whether the secondary digest and the digest sufficiently match. - View Dependent Claims (17)
-
Specification