Onion layer encryption scheme for secure multi-access with single card

Patent metadata

Field	Value
Publication number	US-10657430-B2
Application number	US-201816158759-A
Country	US
Kind code	B2
Filing date	Oct 12, 2018
Priority date	Jul 1, 2015
Publication date	May 19, 2020
Grant date	May 19, 2020

Abstract

A magnetic strip card includes a partial encrypted card payload encrypted with a long shared key to provide a final encrypted payload. A method for encoding the magnetic strip card includes encrypting a card payload with a code key of a access controls with a short key of the access control to generate a partial encrypted payload and encrypting the partial encrypted payload with a long shared key to provide a final encrypted payload.

First claim

What is claimed is:

1. A magnetic strip card of less than several hundred bits, comprising:
a card payload with a code key of an access control encrypted with a short key to generate a partial encrypted card payload, the partial encrypted card payload encrypted with a long shared key to provide a final encrypted payload.

2. The magnetic strip card as recited in claim 1 , wherein the partial encrypted card payload includes card contents unique to each access control encrypted with a short key.

3. The magnetic strip card as recited in claim 2 , wherein individual short key portion is different for each key/access control pair.

4. The magnetic strip card as recited in claim 3 , wherein the final encrypted payload contains individual short key portions for four different key/access control pair.

5. The magnetic strip card as recited in claim 2 , wherein the short key is 24 bits.

6. The magnetic strip card as recited in claim 2 , wherein the long shared key is 128 bits.

7. The magnetic strip card as recited in claim 1 , wherein the partial encrypted card payload is encrypted with a code key of an access control with the short key of the access control.

8. The magnetic strip card as recited in claim 7 , wherein the access control is a lock.

9. The magnetic strip card as recited in claim 8 , wherein the partial encrypted card payload is associated with a single lock.

10. A method for encoding a magnetic strip card of less than several hundred bits, the method comprising:
encrypting a card payload with a code key of an access control with a short key of the access control to generate a partial encrypted payload; and
encrypting the partial encrypted payload with a long shared key to provide a final encrypted payload.

11. The method as recited in claim 10 , wherein the short key is 24 bits.

12. The method as recited in claim 10 , wherein the long shared key is 128 bits.

13. The method as recited in claim 10 , wherein the short key is 24 bits and the long shared key is 128 bits.

14. The method as recited in claim 10 , further comprising encrypting a card payload with a code key for each of a multiple of access controls with a respective short key of the access control to generate the partial encrypted payload.

15. The method as recited in claim 14 , wherein the partial encrypted payload includes at least one code key.

16. The method as recited in claim 14 , wherein the partial encrypted payload includes four code keys.

17. The method as recited in claim 14 , wherein the partial encrypted payload includes a multiple of code keys.

Assignees

• Carrier Corp

Inventors

• Manikantan Shila Devu
• Geng Penghe
• Lakamraju Vijaya Ramaraju
• Soldner Nicholas Charles
• Marchiori Alan

Classifications

• G07C9/00722

  with magnetic components, e.g. magnets, magnetic strips, metallic inserts (mechanical locks operated by permanent magnets E05B47/0038) · CPC title

• G06Q20/347 Primary

  Passive cards · CPC title

• G06K19/06187 Primary

  with magnetically detectable marking · CPC title

• G07F7/125

  Offline card verification · CPC title

• G07C9/00904

  for hotels, motels, office buildings or the like · CPC title