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Key data reduction consumable chip and stored data protection method

A technology of key data and consumable chips, which is applied in the field of printing and can solve problems such as hidden dangers of data security

Active Publication Date: 2016-09-07
HANGZHOU CHIPJET TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current technology, the key data is often stored in the consumable chip in the form of plain text. If a cracker reads the data in the chip through illegal means, the key data can be obtained, and the encryption algorithm of the chip can be cracked based on these key data. , which brings hidden dangers to data security

Method used

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  • Key data reduction consumable chip and stored data protection method
  • Key data reduction consumable chip and stored data protection method
  • Key data reduction consumable chip and stored data protection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Example 1, such as figure 1 Shown: a key data restoration consumable chip, including a chip control circuit, a storage unit for storing data, a communication unit for communicating with a printer,

[0061] It also includes a control unit and a logic encryption module;

[0062] The storage unit includes a non-volatile storage unit and a volatile storage unit;

[0063] The non-volatile storage unit stores initial information, and the initial information includes ciphertext data of seed data and key data;

[0064] The logic encryption module is used to generate the seed data of the key data through the operation of the seed data, and the seed data of the key data is stored in a volatile storage unit;

[0065] It also includes chip software, which is used to read the seed data of key data;

[0066] The seed data of the key data and the ciphertext data of the key data generate the plaintext data of the key data under the operation of the logic encryption module;

[0067]...

Embodiment 2

[0086] Embodiment 2: The difference from Embodiment 1 is that the selection of the logic encryption module is different. In this implementation, the software computing unit includes a software AES encryption module, a software DES encryption module, or a software 3DES encryption module.

[0087]In addition to participating in the data restoration algorithm program, the software computing unit also participates in the calculation of the seed data of the previous key data. Specifically, when the software AES encryption module is used, the software AES encryption module includes 128-bit, 192-bit, and 256-bit standard AES algorithm software , the seed data in the non-volatile storage unit contains the plaintext input and key input encrypted by software AES, the plaintext input can be 128 bits, the key input can be 128 bits, 192 bits and 256 bits, and the software AES encryption module generates The ciphertext is 128-bit data, and n-bit data is used as the seed data of the key data ...

Embodiment 3

[0088] Embodiment 3: The logical encryption module also includes a hardware computing unit.

[0089] The seed data generation of key data can be completed not only by software computing unit, but also by hardware computing unit. The hardware computing unit includes a hardware AES encryption circuit module or a hardware DES encryption module or a hardware 3DES encryption module. If the hardware AES encryption circuit module is used, it can include 128-bit, 192-bit, and 256-bit standard AES algorithm circuits. The seed data in the non-volatile storage unit includes the plaintext input and key input of the hardware AES encryption circuit. The plaintext input is 128 Bits, the key input can be 128 bits, 192 bits and 256 bits, the ciphertext generated by the hardware AES encryption circuit module is 128 bits of data, and the n bits of data are used as the seed data of the key data before the data, and n is not greater than 128 The non-zero natural number; the hardware DES or 3DES e...

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PUM

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Abstract

The invention belongs to the printing field, and particularly relates to a key data reduction consumable chip and a stored data protection method. The invention is realized through the following technical scheme that the key data reduction consumable chip comprises a chip control circuit, a memory cell used for storing data, a communication unit used for communicating with a printer, a control unit and a logic encryption module, wherein the memory cell comprises a non-volatile memory cell and a volatile memory cell; and the non-volatile memory cell stores initial information, and the initial information comprises the encryption data of the seed data and the key data. The invention aims to provide the key data reduction consumable chip and the stored data protection method. The key data is not stored in the chip in a plaintext form, but is reduced into plaintext data through step-by-step encryption, so that the key data can not be cracked and obtained, and the storage safety of the key data is improved.

Description

technical field [0001] The invention belongs to the field of printing, and in particular relates to a key data restoration consumable chip and a storage data protection method. Background technique [0002] With the popularization of office automation, printing equipment has become an indispensable equipment in office activities. During the printing process, printer hosts and consumables such as ink cartridges are needed. At present, consumables generally use chips as the medium of consumables information and consumption. During the use of consumables, interactive communication and authentication with the printer host are required, such as the authentication communication of the printer published in the Chinese patent document with the publication number CN104077537 A , during the authentication process, encrypted data and encrypted algorithms will be used, and the key of the encrypted algorithm and other important data are called key data. However, in the current technolog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/12B41J29/393
CPCB41J29/393G06F3/1219G06F3/1222G06F3/1238
Inventor 孙云虞少平
Owner HANGZHOU CHIPJET TECH