Cryptographic operation

Patent metadata

Field	Value
Publication number	US-11838431-B2
Application number	US-202217970017-A
Country	US
Kind code	B2
Filing date	Oct 20, 2022
Priority date	May 15, 2020
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

A method is suggested for providing a response, wherein the method comprises: obtaining a challenge from a host, determining the response based on the challenge, determining an auxiliary value based on the response or the challenge, providing the auxiliary value to the host, obtaining a random value from the host, checking the validity of the challenge based on the random value, and providing the response to the host only if the challenge is valid. Also, corresponding methods running on the host and system are provided. Further, corresponding devices, hosts and systems are suggested.

First claim

What is claimed is:

1. A method for authenticating a device comprising:
determining a challenge based on a random value, wherein determining the challenge utilizes at least one cryptographic Lattice operation,
providing the challenge to the device,
obtaining an auxiliary value from the device,
providing the random value to the device,
obtaining a response from the device, and
authenticating the device if the response corresponds to the auxiliary value, wherein authenticating the device utilizes at least one cryptographic Lattice operation.

2. The method of claim 1 , further comprising:
obtaining an additional value (μ) from the device,
authenticating the device if the response corresponds to the auxiliary value and the additional value (μ).

3. A host, comprising:
interface circuitry; and
processing circuitry operatively connected to the interface circuitry and configured to:
determine a challenge based on a random value,
provide the challenge to the device, via the interface circuitry, after determining the challenge,
obtain an auxiliary value from the device, via the interface circuitry, after providing the challenge to the device,
provide the random value to the device, via the interface circuitry, after obtaining the auxiliary value from the device,
obtain a response from the device, via the interface circuitry, after providing the random value to the device, and
authenticate the device if the response corresponds to the auxiliary value.

4. The host of claim 3 , wherein the processing circuitry is configured to determine the challenge utilizing at least one cryptographic Lattice operation and to authenticate the device utilizing at least one cryptographic Lattice operation.

5. The host of claim 3 , further comprising wherein the processing circuitry is further configured to:
obtain an additional value (μ) from the device,
authenticate the device if the response corresponds to the auxiliary value and the additional value (μ).

6. A method for authenticating a device comprising:
determining a challenge based on a random value,
providing the challenge to the device,
obtaining an auxiliary value from the device, after providing the challenge to the device,
providing the random value to the device, after obtaining the auxiliary value from the device,
obtaining a response from the device, after providing the random value to the device, and
authenticating the device by determining that the response corresponds to the auxiliary value.

7. The method of claim 6 , wherein determining the challenge and authenticating the device each comprise utilizing at least one cryptographic Lattice operation.

8. The method of claim 6 , further comprising:
obtaining an additional value from the device,
authenticating the device if the response corresponds to the auxiliary value and to the additional value.

Assignees

• Infineon Technologies Ag

Inventors

• Poeppelmann Thomas
• Urian Rainer

Classifications

• H04L9/3271 Primary

  using challenge-response · CPC title

• H04L9/0869

  involving random numbers or seeds · CPC title

• H04L9/0877

  using additional device, e.g. trusted platform module [TPM], smartcard, USB or hardware security module [HSM] · CPC title

• H04L9/3093

  involving Lattices or polynomial equations, e.g. NTRU scheme · CPC title

• H04L9/0643 Primary

  Hash functions, e.g. MD5, SHA, HMAC or f9 MAC · CPC title