Tayoub, Walid2018-02-062018-02-062013http://dspace.univ-msila.dz:8080//xmlui/handle/123456789/2461The objective of this dissertation is to find the most efficient and suitable cryptosystems for intelligent mobiles environments, from the speed and safety aspects, by taking in consideration the limited resources of these mobiles. We studied some cryptosystems and we took out the best of them. Then we implemented them on some android mobile phones. After that, we have made an analytical study for the different operations as encryption and decryption…etc., and after the comparison of the obtained results gave us a high level of security and firmness.enNTRU;ECC; Android mobile; performanceThesis