US 11,777,920 B2Granted

Authentication system for preventing replication of authentication target apparatus authenticated by authentication apparatus

AssigneeCanon Kabushiki Kaisha

InventorKenjiro Hori

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Abstract

An authentication-target apparatus receives identification information, a password, and a challenge from an authentication apparatus, hashes the password, executes password authentication by reading out comparison information corresponding to the identification information and comparing the hashed password and the comparison information, generates a response based on the challenge in a case where the password authentication is successful, and transmits the response to the authentication apparatus. The authentication-target apparatus obtains an encrypted authentication calculation code, which is a stored program code corresponding to the identification information, decodes an executable authentication calculation code from the encrypted authentication calculation code using the password successful in the password authentication, and generates the response by executing the authentication calculation code by applying the challenge to the authentication calculation code.

Claims13

Dependent claims

An authentication-target apparatus comprising:

at least one processor;
and
at least one memory storing instructions that, when executed by the at least one processor, cause the authentication-target apparatus to function as:
a reception unit configured to receive identification information, a password, and a challenge from an authentication apparatus;
a hash calculation unit configured to hash the password;
a password authentication unit configured to execute password authentication by reading out comparison information corresponding to the identification information and comparing the hashed password and the comparison information;
a generation unit configured to generate a response based on the challenge in a case where the password authentication is successful;
and
a transmission unit configured to transmit the response to the authentication apparatus,
wherein the generation unit is further configured to
obtain an encrypted authentication calculation code, which is a stored program code corresponding to the identification information,
decode an executable authentication calculation code from the encrypted authentication calculation code using the password successful in the password authentication, and
generate the response by executing the authentication calculation code by applying the challenge to the authentication calculation code.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/192,071Filed 4 Mar 2021
Priority: JP 2020-0381195 Mar 2020
Published: US 2021/0281556 A19 Sep 2021
Granted: 3 Oct 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification11 codes

H04L 9/3242
Using cryptographic hash functions: involving keyed hash functions, e.g. message authentication codes [MACs], CBC-MAC or HMAC
H04L 63/083
For authentication of entities: using passwords
G06F 21/45
Authentication, i.e. establishing the identity or authorisation of security principals: structures or tools for the administration of authentication
H04L 9/0618
The encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions;…