The exchange of information in the digital age has developed rapidly. Cause to Exchange and share information through electronic channels. Data security is important. Encryption is a method that helps to maintain the confidentiality of the data. Prevent unauthorized people can access it. With the encryption algorithm-decrypt that there are many.Each algorithm has strengths and weaknesses that are different. To make encryption algorithm-decrypt applied optimal. The user must know the strengths and weaknesses of these. Presentation of the results of research comparing the effectiveness of encryption algorithm-decrypt the symmetric Block Cipher types include 1 Advanced Encryption Standard (AES)), 2), Data Encryption Standard (DES), Triple Data Encryption Standard), 3 (3DES). Compare the difference bit (Avalanche Effect) and time (Times). By using the OpenSSL tool to test. .Txt files and .jpg and use as data in the test. The results of the test the AES algorithm, the difference of the most bits and use as little time as possible. 3DES algorithm, but the difference is equal to bit DES takes most.
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