Security problem is one of many important aspect in information system. In communications will be messagesending to another people. So, definitely those message must arrive safely. An information generally should only be shown for certain people, it is very important to prevent message’s security to fall to the wrong hands. To lessen criminal activity within data security, so cryptography can be use as the right solution.In this research, Chaos theory with logistic Map will be use to generate keys randomly and long. Then those keys implemented to Stream Cipher algorithm and Electronic Code Book (ECB). With these Chaos theory, random keys will be generated and key’s length will be same with the plaintext in Stream Cipher. While in ECB, a random key’s length will be added so weakness can be covered. From this research’s result, Chaos theory with Logistic Map can make remembering random and long keys easier. Other than that, this research also developing in some certain iteration number which was generated by Logistic Map can be chosen as key’s first iteration number, so in keys generation, variation and possibility in keys guessing will beudincreased.
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