FIELD: communication.
SUBSTANCE: invention relates to secure information transmission via a communication network. Homomorphous encryption is used for protection of an authentication string, for example a password, during authentication both on a client device and on a server device. Embodiment options relate to a server device and a client device made with the possibility of authentication of a client device user. The user has an access to the authentication string. The server device is made with the possibility of encryption of a dataset of a symbol/position according to a homomorphous encryption algorithm. The client device allows for the user to select a subset from the encrypted set, from which a verification number is calculated, using a homomorphous operation.
EFFECT: increase in the security of data transmission.
17 cl, 7 dwg
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