Title:
PQA LOCK RELEASE
Document Type and Number:
Japanese Patent JP2022013809
Kind Code:
A
Abstract:
To provide a lock release in a secure integrated circuit (IC) chip device.SOLUTION: A secure IC chip device 26 has a memory 28, an interface, and a chip security circuit, and the memory stores an encryption value E and a unidirectional function output value H. The unidirectional function output value H is an output value of a unidirectional function calculated by inputting a nonce N. The interface is used for a data transmission with an external device. The chip security circuit prevents it from being used by locking one part of the chip device, receives a cancel request from a lock release hardware security module (HSM) by the interface, presents the encryption value E to the HSM, responses the cancel request, and receives a value N' from the HSM. The value N' is a decoding value of the encryption value E, and a unidirectional function output value H' is calculated on the basis of the value N'. By comparing the value H' with the value H, when the value H' is matched with the value H, one part of the chip device is cancelled and is enabled.SELECTED DRAWING: Figure 1
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Inventors:
OREN TANAMI
ZIV HERSHMAN
ZIV HERSHMAN
Application Number:
JP2021106305A
Publication Date:
January 18, 2022
Filing Date:
June 28, 2021
Export Citation:
Assignee:
NUVOTON TECHNOLOGY CORP
International Classes:
H04L9/32; G06F21/44; G09C1/00
Domestic Patent References:
| JP2017038429A | 2017-02-16 |
Foreign References:
| CN109218025A | 2019-01-15 | |||
| US20170353315A1 | 2017-12-07 | |||
| EP3511853A1 | 2019-07-17 |
Attorney, Agent or Firm:
Cosmos International Patent and Trademark Office
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