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Cryptography is an area of computer science which is developed to provide security for the senders and receivers to transmit and receive confidential data through an insecure channel. In this paper an Encryption/ Decryption method will be proposed to enhance the frequency latter performance. To protect information from disclosed by the attacker encryption must be apply on the information, the encryption propose is based on logarithm equation, where the logarithm base will be act as the secret key of the algorithm. The strength of the result values for a plaintext is the long key range, but the problem with the relative frequency of the letters. Solving frequency distribution for a language three different methods propose to hide the relative frequency of the letters. However, the methods will add a second level of security on the encrypted information that produces from the logarithm which enhances the security.