現今有許多密碼系統，這些密碼系統廣泛的被使用在各個領域，如銀行的提款機、金融業的財金系統、電子交易貨幣中，各個密碼系統都有其特定的特色、優點與缺點，本論文提出的方法是將Fuzzy演算法移植至資訊安全的領域中，使用了Fuzzy集合概念、Fuzzy關係概念、Fuzzy矩陣概念發展了一套密碼系統，並與一些近代的密碼系統作些分析比較，由實驗分析的結果知道其複雜度明顯的增加，相對地也較具安全性，並且密碼系統也有不錯的效能。

Many methods of cryptography are available nowadays. They are used in several situations such as financial processing system, electronic commerce and electronic data interchange. Each has its own specific purpose and implementation algorithm. But no one is without any disadvantage even the best policy is carried on. The thesis proposed a method based on Fuzzy Theory to improve the information security by increasing the complexity of decryption for fuzzy-based encryption source data. The simulation results of security quality are better than former cryptographies as in this paper. Thus, the fuzzy-based encryption algorithm can be used in cryptosystem if needed.

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