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Construction of perfect A3-codes from projective geometry over finite fields

CHEN Shangdi, LIANG Junying   

  1. (Intelligent Signal and Image Processing Key Lab of Tianjin, CAUC, Tianjin 300300, China)
  • Received:2017-09-15 Revised:2017-10-31 Online:2018-04-25 Published:2018-05-02

Abstract: To solve the problem of incredible arbitration in the authentication codes with arbitration, the concept of A3-codes is proposed. In an A3-code, none of the three participants is assumed trustable including transmitter,receiver and arbiter. This authentication system is more suitable for realistic environment with extensive application prospect. A perfect A3-code is constructed by using subspace structure and counting method of projective geometry over finite fields, parameters of the constructed code are given, and the maximum success probabilities of various cheating attacks are also calculated. Compared with some known A3 codes, this code has obvious advantages. Simulation results show that this code has good security.

Key words: A3-code, projective geometry, finite field

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