AUTHENTICATED ENCRYPTION DEVICE, AUTHENTICATED ENCRYPTION METHOD AND PROGRAM FOR AUTHENTICATED ENCRYPTION Russian patent published in 2018 - IPC H04L9/06 G09C1/00 G06F21/30 

FIELD: electrical communication engineering.

SUBSTANCE: invention relates to devices and methods for authenticated encryption. Authenticated encryption device comprises an authenticated encryption means for applying a two-round Feistel structure using an encryption function to which an auxiliary variable is assigned, for the round function for every two blocks, to the input plaintext or ciphertext to generate by means of this ciphertext or decrypted plaintext. Authenticated encryption tool finds a fragment of the ciphertext CC[i]=(C[i_1], C[i_2]), corresponding to an i^th plaintext fragment MC[i]=(M[i_1], M[i_2]), when splitting the plaintext into chunks by two blocks, like: C[i_1]=F_K((N, Tw_i_1), M[i_1]) xor M[i_2]; C[i_2]=F_K((N, Tw_i_2), C[i_1]) xor M[i_1].

EFFECT: technical result is to provide single-pass and one-speed authenticated encryption with the ability to perform parallel processing, and also perform completely encryption and decryption processing by using only one encryption function.

12 cl, 20 dwg