METHOD FOR RESTRICTION OF ACCESS TO DATA USING ATTRIBUTE-BASED ENCRYPTION Russian patent published in 2023 - IPC H04L9/06 H04L9/08 H04L9/30 

FIELD: data encryption.

SUBSTANCE: pairs of public and private keys are generated using a public key distribution scheme for each participant, and a corresponding attribute is assigned to each participant’s private key. An access structure is defined that describes the rights of participants to gain access to data. A random secret key of the symmetric encryption algorithm and a public-private key pair are generated to generate a shared secret value. The data is encrypted using a symmetric encryption algorithm key. At least one ordinal position of each participant having the right of access in a given access structure is determined. The participants' shares and auxiliary values are calculated to ensure subsequent access to the secret, using a scheme for sharing the shared secret between the participants, based on the generated private key to generate a common secret value, the public keys of the participants, which are in a given access structure, the ordinal position of each participant in access structure and secret key of the symmetric encryption algorithm. Encrypted data and an access structure containing the auxiliary values are published.

EFFECT: increased security of data access.

7 cl, 3 dwg