Keywords : Codes


A Geometric Construction of Complete (kr ,r)-arcs in PG(2,7) and the Related projective [n,3,d]7 Codes

Nada Kasm Yahya

AL-Rafidain Journal of Computer Sciences and Mathematics, 2018, Volume 12, Issue 1, Pages 24-40
DOI: 10.33899/csmj.2018.163568

      A (k ,r)-arc is a set of k points of a projective plane PG(2,q) such that some  r,
but no r + 1 of them, are collinear. The  (k ,r)-arc is complete if it is not contained in
a (k + 1,r)-arc.
     In this paper we give geometrical construction of  complete (k r ,r)-arcs in PG(2,7),
 r = 2,3,…, 7, and the related projective [n,3,d]7 codes.
 

Development Hyper Algorithm for Encryption Arabic Text using Mors Code

Najla Dabagh; Melad jader saeed; Subhi Hamadi

AL-Rafidain Journal of Computer Sciences and Mathematics, 2007, Volume 4, Issue 1, Pages 193-209
DOI: 10.33899/csmj.2007.164011

Morse code is considered as one of the codes that are used to transfer information among long distant areas.
            The research concentrates on Morse code applications, transmissions to overcome  weakpoints, a necessary mixture between coding and cryptography to get benefits from the properties of each one of them to increase the secrecy of morse code  transmission.
            Anew algorithm was put in use for encryption and decryption which passes through multistage process, each stage has special properties that make the transmission more confident and safer than the stage before.
            In addition to the ability of using password as a key, which is at the same time passed through the same encryption processes which make it hard to break.
            This work is applied on integrated programming environoment which is (MATHCAD).