6 results about "Preservation metadata" patented technology

The application relates to the technical field of data encryption, in particular to a data encryption method, which comprises the following steps: capturing input streams of a first file according to a preset delimiter to obtain captured data and a first template and first data, segmenting the first data according to a first length to obtain a first array and filling the first array to obtain a second array and a first index array, obtaining an encrypted slice sequence, a second index sequence and a key sequence through encryption, then constructing a second file, saving metadata and the second file on a first physical machine, and saving the encrypted slice sequence on a second physical machine. The method realizes block reading and processing of a source file in a streaming manner, effectively processes the source file and saves memory, the data block encryption and the key are independent, the corresponding ciphertext block is decrypted to obtain plaintext according to access permission, and the influence range of a security event is effectively limited.

The invention relates to the technical field of data encryption, in particular to a data encryption method, which comprises the following steps: capturing an input stream of a first file according to a preset divider to obtain captured data, a first template and first data, and dividing the first data according to a first length to obtain a second template; obtaining a first array, filling the first array to obtain a second array and a first index array, obtaining an encrypted slice sequence, a second index sequence and a key sequence through encryption, further constructing a second file, storing metadata and the second file on a first physical machine, storing the encrypted slice sequence on a second physical machine, and storing the encrypted slice sequence on a second physical machine; the stream mode plays a role in reading and processing the source file in blocks, plays a role in efficiently processing and saving the memory, the data block encryption and the secret key are independent, and the purposes that the corresponding ciphertext block is decrypted according to the access authority to obtain the plaintext and the influence range of the security event is effectively limited are achieved.

The application discloses a metadata loss prevention method and device, a readable storage medium and an electronic device. After a system obtains a metadata writing instruction, corresponding metadata is written into a target data block according to the metadata writing instruction. When it is detected that the metadata in the target data block is not completely saved, the target data block storing the metadata is erased, a new target data block is obtained again to save the metadata, and the completeness of the metadata is detected again until the metadata is completely saved in the data block, so that the metadata written in the data block is complete metadata, loss of the metadata is avoided, and the completeness of metadata saving is improved and the risk of metadata loss is reduced.

The application discloses an astronomical data processing method, comprising the following steps: processing a fits file to change the storage mode of the fits file from row type to column type; extracting and separately storing metadata, and uninterruptedly storing main data information except the metadata; performing noise reduction processing on a numerical matrix in the main data information, and separately storing noise data; and performing prediction processing on other elements in the numerical matrix except the noise through multiple prediction modes, and recording a prediction mode with the minimum compression rate and corresponding numerical values. The application utilizes the locality and noise existing in astronomical data, applies a numerical prediction strategy to a multi-dimensional numerical matrix, and improves the lossless compression rate through the preprocessing. Firstly, the data arrangement mode of the fits format file is reorganized, and then noise separation and numerical prediction are performed on the numerical data with the largest proportion, so that the effective data is more concentrated, and thus is more suitable for compression.

This invention discloses a method for encrypted storage and access in the IPFS file system. The upload client obtains the file to be uploaded and its encryption level based on user actions, and retrieves a first public key from the key management server. The upload client generates a random string and uses it to encrypt the file to be uploaded, resulting in an encrypted file. The random string is then encrypted according to the encryption level and the first public key, yielding the key ciphertext. The upload client sends the encrypted file to the IPFS server, obtaining a content identifier generated by the IPFS server based on the encrypted file. The server then sends metadata to the application server for storage. The metadata includes the content identifier, the key ciphertext, and the encryption level. This invention stores encrypted files in the IPFS file system and encrypts the random string according to the encryption level, thus solving the security problems of the IPFS file system and better meeting users' security needs.

The application relates to the technical field of computers and discloses a metadata saving method and device, a computer device and a storage medium, which comprise the following steps: after a hard disk is powered on again under multiple hard disk types, the current ratio between the average flash memory erasing times of the hard disk, the average power-on time of the hard disk, the metadata change quantity and the metadata snapshot quantity is obtained, and the number of times ratio between the average flash memory erasing times is determined; the current ratio is adjusted according to the average power-on time, the average flash memory erasing times and the number of times ratio to obtain a target ratio; the metadata change quantity is determined, and a metadata snapshot is generated in the memory according to the target ratio, the metadata change quantity and the metadata; and the metadata snapshot in the memory is written to the hard disk corresponding to the metadata in the metadata snapshot. The application solves the problem that the ratio of delta and base cannot adapt to the current state of the SSD when saving metadata, and the service life and the average power-on time of the SSD cannot reach the best state.