50results about How to "Implement integrity checks" patented technology

The embodiments of the invention disclose integrity checking method and device for bullet screen data, a terminal and a memory medium. A method comprises the steps of converting target bullet screen data of a preset character string structure into a target character array, and taking a first character element in the target character array into a current character element; detecting whether the current character element is a preset separator or not, taking a current end position as a current start position if the current character element is the preset separator, taking a position of the current character element as the current end position, and checking a first character string between the current start position and the current end position; if the current character element is not the preset separator, or the first character string is checked successfully, when the current character element is not the final character element in the target character array, updating the current characterelement, and returning to execute operation of detecting whether the current character element is the preset separator or not; and determining that the target bullet screen data is checked successfully when the current character element is the final character element, and carrying out integrity checking on the bullet screen data.

The invention relates to the chip focusing resistance ion beam attack field and provides a top metal protection layer integrity detection method based on a sigma-delta modulator. In the method, through detecting whether a resistance value of a metal line is changed, whether a protection layer is complete is detected and then whether an attacker uses FIB to correct the protection layer is determined. A chip top protection layer integrity detection apparatus is formed by a top metal line AB, operation amplifiers AMP and AMP1, PMOS pipes M1 and M2, an NMOS pipe M3, switches S1 and S2, a reference current source I, a comparator COMP with a clock terminal, a counter CT and a digital comparator DCMP. The apparatus is mainly applied to a chip focusing resistance ion beam attack occasion.

The method and system for data file encryption and integrity verification in an untrusted server environment provided by the present invention relate to the technical field of data privacy protection, and the method includes: 1) system initialization; 2) generating public and private keys of BGN homomorphic encryption algorithm; 3) ) Construct public and private keys for data signature; 4) Use BGN homomorphic encryption algorithm public key to encrypt data files; 5) Construct tags for all file blocks in the data file according to the private key of data signature; 6) Upload encrypted files and tags Gather to the cloud server; 7) Send the file integrity challenge to the cloud server to return the label sum and the file block sum; 8) Use the file block sum and the public key of the data signature to verify the label sum to judge the ciphertext stored in the cloud server File integrity: the present invention combines the BGN homomorphic encryption algorithm and the PDP data possession proof protocol to construct a data signature to realize the integrity check of the encrypted file, and improve the privacy protection and usability of the data file in an untrusted server environment.