AUTHENTICATION TAG GENERATION DEVICE, AUTHENTICATION TAG GENERATION METHOD, AND AUTHENTICATION TAG GENERATION PROGRAM

Title:

AUTHENTICATION TAG GENERATION DEVICE, AUTHENTICATION TAG GENERATION METHOD, AND AUTHENTICATION TAG GENERATION PROGRAM

Document Type and Number:

WIPO Patent Application WO/2024/127530

Kind Code:

A1

Abstract:

This authentication tag generation device generates an authentication tag, using a tweakable block cipher whose inputs and outputs are of n bits in size, from vector-form input data in which the length of each element is arbitrary and a vector length r is arbitrary, the authentication tag generation device comprising: r element processing units that receive each element of the input data, divide the elements in units of n bits, encrypt each of the units using a tweakable block cipher, add the encryption results together, and then output a first output, as well as outputting, as a second output, the result of having repeated the addition of the encryption results and the multiplication of an arbitrary non-zero non-unit element constant; an aggregation unit that receives and adds together the first output from each of the r element processing units and then outputs a third output, as well as receiving the second output from each of the r element processing units and then outputting, as a fourth output, the result of having repeated the addition of each of the second outputs and the multiplication of an arbitrary non-zero non-unit element constant; and a tag generation unit that encrypts the third output using a tweakable block cipher in which the fourth output and the vector length r are used as tweaks, as well as encrypting the fourth output using a tweakable block cipher in which the third output and the vector length r are used as tweaks, and then generates an authentication tag.

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Inventors:

FURUYA ISAMU (JP)
MUKAI AKIKO (JP)
MINEMATSU KAZUHIKO (JP)

Application Number:

PCT/JP2022/045937

Publication Date:

June 20, 2024

Filing Date:

December 13, 2022

Export Citation:

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Assignee:

NEC CORP (JP)

International Classes:

H04L9/32

Attorney, Agent or Firm:

KATO, Asamichi (JP)

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