Privacy protected information medium using a data compression method

• US 5,499,293 A
• Filed: 01/24/1995
• Issued: 03/12/1996
• Est. Priority Date: 01/24/1995
• Status: Expired due to Term

• Current Assignee: University of Maryland
• Original Assignee: University of Maryland
• Inventors: Grauzlis, Nancy T., Joseph, Sammy W., Behram, Sepehr
• Primary Examiner(s): GREGORY, BERNARR E
• Application Number:
  US08/378,165
• Time in Patent Office: 413 Days
• Field of Search: 380/4, 380/23, 380/24, 380/25, 364/413.02, 341/51, 341/55, 341/90, 341/91, 341/92, 341/95, 341/106, 235/375, 235/380
• US Class Current: 705/76
• CPC Class Codes: G06Q 20/346 Cards serving only as information carrier of service
• CPC Class Codes: G06Q 20/3821 Electronic credentials
• CPC Class Codes: G07F 7/1008 Active credit-cards provided with means to personalise their use, e.g. with PIN-introduction/comparison system
• CPC Class Codes: G16H 10/65 stored on portable record carriers, e.g. on smartcards, RFID tags or CD

Abstract

The present invention uses an efficient data compression/decompression scheme using a passive data storage media such as a card-based approach for storage of medical data information. The invention operates on existing personal computer hardware in a medical center or doctors'"'"' offices, doing away with expensive investments in specialized technologies of central processing hardware. The invention is very economical to implement, at a cost of less than a dollar per card generated for a patient'"'"'s use. With the advent of inexpensive desktop computing, a number of inventions have been offered to improve medical information storage and retrieval. They include the development of portable medical card technologies such as SmartCards and optical cards which are capable of storing medical information and can be carried by the patient. This card based system provides a methodology for storage and retrieval of medical information from a passive credit-card sized instrument. The card is manufactured with minimal expense using existing well known optical scanning or magnetic tape reading or a data interrogation means in a SmartCard based system.

Claims

1. A data compression/decompression method using very large lists which define a modifiable static dictionary means comprising a primary and secondary dictionary for data compression with a means for input of informational (INFO) data to a means for computing, the computing means transforms the INFO data into confidentially protected output encoded data, the output encoded data is transmitted over a data transmission means for ultimate data storage by a data storage means, the method comprising the steps of:

assigning a sequential primary unique identification (ID) number to each word that is a part of the input INFO data that is within the very large list of data, the ID number is equal to a pointer position for each of these words in the secondary dictionary, the secondary dictionary has a structure for these words with the following features;

i) each word can be a single phrase that is at least one word associated therewith, ii) the length of each word and iii) the primary unique ID number;

manipulating sequentially each of the primary unique ID numbers by a mathematical number base conversion technique that transforms the primary unique ID numbers into secondary numbers;

using at least a first designated key code by a user of the method for encryption of the secondary numbers;

transmitting each of the secondary encrypted numbers over the data transmission means sequentially for ultimate storage in the storage means;

whereby the secondary encrypted numbers can be retrieved at a later time even when the modifiable primary static dictionary changes.

2. The method of claim 1 further includes the technique of decompression of the output encoded data at the data storage means by further including steps of:

inputting the at least first user key code into the computing means;

inputting the encrypted secondary numbers from the data storage means;

transforming sequentially each of the secondary unique ID numbers by the mathematical number base conversion technique using the user designated key code;

sequentially translating the primary numbers into words stored in a third dictionary that enables vertical integration of the primary dictionary, and outputting the words from the computing means into a text readable form.

3. The method of claim 2 wherein the very large lists of data comprises a medical patient'"'"'s data file and the output storage means is a wallet sized card, the at least first designated key code for encryption of the secondary numbers is an mathematically manipulated offset technique that locates a starting point within the data string, a specialized data compression/decompression converts dates and telephone numbers into a different number base, and each line of output data on the card has two checksum values whereby error-free data entry is ensured for accuracy of the patient'"'"'s file.

4. The method of claim 3 wherein the key code is an alphanumeric code confidentially known by the user to maintain privacy of the INFO data.

5. The method of claim 3 wherein the the key code is encoded on the card to allow access by the possessor of the card.

6. The method of claim 1 wherein the output encoded data is alphanumeric characters encoded on the storage means such as a visual printed card, a magnetic strip on a card, an optical card, a smart card and bar coded strip card.

7. A medical data card for storing confidential medical data of a patient in encoded form that maintains privacy of the patient comprising:

a portable wallet sized card with a data storage medium;

the encoded form of the medical data is in a form determined by a method using;

very large lists stored in a computing means that define a modifiable static dictionary means comprising a primary and secondary dictionary with a means for input of the patient'"'"'s medical data into the computing means which transforms the medical information into confidentially protected alphanumeric output encoded data, the output encoded data is stored on the card by;

assigning a sequential primary unique identification (ID) number to each word that is a part of the input medical data that is within the very large list of data, the ID number is equal to a pointer position of each of these words in the secondary dictionary;

manipulating sequentially each of the primary unique ID numbers by a mathematical number base conversion technique that transforms the primary unique ID numbers into secondary numbers;

using at least a first designated key code preselected by the patient for encryption of the medical data; and

storing each of the secondary numbers sequentially on the card storage medium which contains the encoded information.

8. The medical data card of claim 7 wherein the at least first designated key code preselected by the patient is a number confidentially known by the patient whereby privacy of the medical data is maintained.

9. The medical data card of claim 7 wherein the the at least first designated key code preselected by the patient is encoded on the card to allow access by a possessor of the card.

10. The medical data card of claim 7 wherein the output encoded data is alphanumeric characters printed on the card for optical scanning of the card, each line of output encoded data on the card has two checksum values to ensure accuracy of medical data entry.

11. The medical data card of claim 7 wherein the output encoded data is in a magnetic data form for magnetic data reading means.

12. The medical data card of claim 7 wherein the output encoded data is in a bar coded data form that is used in conjunction with optical scanning means.

13. The medical data card of claim 7 wherein the output encoded data is in digital form for storage media such as a smart card, optical card and chip cards.

14. The medical data card of claim 7 wherein the output encoded data is in a mixed modality format of alphanumerics and magnetic strip.

15. The medical data card of claim 7 wherein the card is a storage medium of the patients medical data such as specialized obstetrics/gynecology information and specialized pediatrics information concerning infants.