Method for decrypting encrypted data in USB (universal serial bus) storage device
A technology for encrypting data and storage devices, which is applied in the field of secure storage applications, can solve problems such as slow data decryption speed, and achieve the effects of improving security, using convenience, and increasing data transmission speed
Active Publication Date: 2011-04-20
苏州国芯科技股份有限公司
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Problems solved by technology
However, the current design generally has the problem of slow data decryption
Method used
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Embodiment
[0030] Embodiment: a kind of decryption method for encrypted data in USB storage device, comprises the following steps:
[0031] step 1. Set the adapter device between the host and the U disk, the slave port USB Dev of the adapter device is connected to the master port of the host, the master port USB Dev of the adapter device is connected to the slave port of the U disk, and the decryption of the adapter device The module is used to decrypt the transmission data between the host and the U disk. There are four data buffer areas in the switching device, and its first data storage area, second data storage area, third data storage area and fourth data storage area The storage areas are arranged in a clockwise direction;
[0032] Step 2. The slave port of the switching device receives the read command and the length of the data unit from the host, and forwards the read command and the length of the data unit to the U disk;
[0033] Step 3. Configure host pointer usbDevicePos,...
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The invention relates to a method for decrypting encrypted data in a USB (universal serial bus) storage device, a switching device is arranged between a host and a U disk, and a first data memory area, a second data memory area, a third data memory area and a fourth data memory area of the switching device are arranged along the clockwise direction; a host pointer, a U disk pointer and a decryption pointer are configured, the host pointer and the U disk pointer point to a next data buffer area along the clockwise direction, an encryption pointer simultaneously points to the next data buffer area along the clockwise direction, and the host pointer simultaneously points to the next data buffer area along the clockwise direction; and a main port of the switching device is used for transmitting next unit ciphertext data to the data buffer area pointed by the U disk pointer, the decryption module is used for decrypting the data in the data buffer area pointed by the decryption pointer, andthe switching device is used for transmitting the data in the data buffer area pointed by the host pointer from the port to the host. By adopting the method, the separation of plaintext data, the ciphertext data and the encryption algorithm can be realized, and the data decryption speed between the host and a mobile storage device can be further improved.
Description
technical field [0001] The invention relates to a method for decrypting encrypted data in a USB storage device, belonging to the field of safe storage applications. Background technique [0002] At present, U disk storage devices are widely used. For data security, encrypted data is often stored in U disk storage devices to effectively protect the security of digital asset information and prevent it from being obtained by illegal users. Therefore, it is widely used in various information security fields to encrypt and save the original text data to the U disk storage device at high speed. [0003] At present, in order to decrypt the encrypted data stored in the U disk storage device, the measure taken is to add a decryption module to the common mobile storage device. However, the current design generally has the problem of slow data decryption. [0004] With the widespread use of large-capacity mobile storage devices such as U disk storage devices, the amount of encrypted ...
Claims
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IPC IPC(8): G06F12/14
Inventor 郑茳肖佐楠匡启和王廷平尤国芳
Owner 苏州国芯科技股份有限公司