| Summary: | Personal computers has become one of the important part of human life, especially when they using the Internet or any public networks.So, the information or data may still be deliberately or inadvertently leaked out by the insiders or customers.In this paper, we proposing new algorithm to protect any type of data, depending on the substitution techniques, using
dynamic key (DK) and reveres string for each character in the text (or field in the file of the database) and each string .A special equation was developed to generate the DK, it’s depend on the length of string, order the character in the string,ASCII code of the character, and string sequence.The proposed algorithm using the reverse string before encryption, also, there are two actions after that, for the purpose of increasing the complexity of the algorithm.The results showed that The developed algorithm was successes to remove any duplicate encryption, for each character and each record even when the text duplicated.
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