Data extraction method, secret key generation method, unlocking method and unlocking device
The invention discloses a data extraction method, a secret key generation method, an unlocking method and an unlocking device. The data extraction method comprises the following steps: determining a secret key when a target file is encrypted to obtain a first ciphertext; determining an initial extra...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention discloses a data extraction method, a secret key generation method, an unlocking method and an unlocking device. The data extraction method comprises the following steps: determining a secret key when a target file is encrypted to obtain a first ciphertext; determining an initial extraction position for data extraction from the first ciphertext through the secret key; and based on the value of the initial extraction position in the first ciphertext, determining other extraction positions for performing data extraction from the first ciphertext, and performing data extraction fromthe first ciphertext. Data is extracted from the first ciphertext, the complete first ciphertext is divided into two parts, and verification can be performed based on the extracted data, so that evenif the residual data in the extracted first ciphertext is leaked, verification and unlocking cannot be performed through the part of data, and therefore, compared with the prior art, the security risk can be reduced.
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