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Method and device for storing ciphertext

A ciphertext and key technology, applied in computer security devices, digital data protection, internal/peripheral computer component protection, etc., can solve problems such as data cannot be decrypted

Active Publication Date: 2021-09-17
HONOR DEVICE CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present application provides a method and device for storing ciphertext, which can solve the problem that the data in the external memory cannot be decrypted after the electronic device is reset at the factory level

Method used

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  • Method and device for storing ciphertext
  • Method and device for storing ciphertext

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Embodiment Construction

[0054] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0055] figure 1 A hardware system suitable for the apparatus of the present application is shown.

[0056] The device 100 can be a mobile phone, a smart screen, a tablet computer, a wearable electronic device, an in-vehicle electronic device, an augmented reality (AR) device, a virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (ultra mobile computer) - mobile personal computer, UMPC), netbook, personal digital assistant (personal digital assistant, PDA), projector, etc. The embodiment of the present application does not impose any limitation on the specific type of the device 100.

[0057] The device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, ...

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Abstract

The invention provides a method and device for storing a ciphertext, and the method comprises the steps: obtaining an encryption instruction which indicates to encrypt a file in an external memory; acquiring a characteristic value of a first account identifier according to the encryption instruction; using the characteristic value of the first account identifier to encrypt a first secret key and generating a first ciphertext, wherein the first secret key is used to encrypt a second secret key, and the second secret key is used to encrypt a first file in the external memory; encrypting the characteristic value of the first account identifier to generate a second ciphertext; and storing the first ciphertext and the second ciphertext in a non-erasable partition. According to the method and the device, the problem that the data in the external memory cannot be decrypted after the electronic equipment executes factory-level reset can be solved.

Description

technical field [0001] The present application relates to the field of terminals, and in particular, to a method and device for storing ciphertext. Background technique [0002] With the emergence of large data volume services such as enhanced mobile broadband (eMBB) and high-definition video, electronic devices face the problem of insufficient storage space. An external memory (such as a secure digital (SD) card) connected to an electronic device can solve the problem of insufficient storage space. In order to ensure data security, the data in the external memory needs to be encrypted and stored. [0003] The key of the external memory is encrypted by the lock screen password and stored in the erasable partition of the electronic device. When the user performs a factory reset on the electronic device, the encrypted key in the removable partition (ie , ciphertext) is deleted before it can be saved, so that the data in the external memory cannot be decrypted. SUMMARY OF TH...

Claims

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Application Information

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IPC IPC(8): G06F21/79G06F21/60
CPCG06F21/79G06F21/602G06F21/78G06F21/6209H04L9/14
Inventor 于洪健李霜王飞
Owner HONOR DEVICE CO LTD
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