published by Aِl-Baath University in 2014 in and research's language is العربية Download

Lester S. Hill public son article "Cryptography in an Algebraic Alphabet" , dans American Mathematical Monthly, Vol .36, pp. 306-312, 1929

H.S.A. Rose, Course in number theory. Oxford Sciences Publication. (Clarendon), 1988

B. Schneier , Applied cryptography. Second edition, protocols, algorithms and source coding C(John Wiley\& Sons), 1996

M. I. Sowalle, Introduction to cryptology, Dist. Center, (Arabic version)Riyadh, 1996

D. Welsh, Codes and Cryptography, Oxford Science publications,1988