Norul Hidayah Lot @ Ahmad ZawawiKamaruzzaman SemanNurzi Juana Mohd Zaizi2024-05-272024-05-272014International Journal of Computer and Information Technology (ISSN: 2279 – 0764) Volume 03 – Issue 05, September 20142279 -0764643-2https://www.ijcit.com/archives/volume3/issue5/Paper030507.pdfhttps://oarep.usim.edu.my/handle/123456789/4174The objective of this research is to propose a new algorithm based on the existing Grain - 128 stream cipher algorithm. The comparison of Grain - 128 and Modified Grain - 128 will be evaluated by using NIST Statistical Test Suite. The NIST Statistical Test Suite is conducted to determine the randomness of both algorithms. Conclusively, the Modified Grain - 128 is random based on 1% of significance level compared to the Grain - 128 which is not random at the same significance level.encomponent;Grain - 128,stream cipher algorithm,NIST Statistical Test Suite,statistical randomness testing,significance levelArticle90290835