TY - THES N1 - Bambang Sugiantoro, S.Si., MT ID - digilib16329 UR - https://digilib.uin-suka.ac.id/id/eprint/16329/ A1 - IMAM HERIANTO, NIM. 10651021 Y1 - 2015/05/19/ N2 - Security is preferred in information systems, especially in the exchange of data that are important or confidential. The information will be given to the party entitled to such information should really be kept, do not fall into the hands of others who do not have a right to that information. One of the efforts to preserve and guarantee the security of information or data is to use cryptographic techniques. Cryptography is the art and science of hiding information from third parties. Advanced Encryption Standard (AES) and Twofish are two examples of some symmetric cryptographic algorithms based on block ciphers. Both systems use the same key of symmetric cryptography, 128-bit block size, and 128, 192, 256 key length. This study aims to analyze the performance comparison AES and Twofish in speed encryption and decryption process, the value of avalanche effect, and the exhaustive key search. This comparison is facilitated by DP ? Multicrypt software. Based on the results of this study concluded that a process of encryption and decryption algorithm is faster than the AES algorithm Twofish, because AES has a simpler structure. While the Twofish algorithm tougher than AES against cryptanalysis because it has a larger avalanche effect. And exhaustive key search on both the algorithm generates a value of loading very large, this causes said second algorithm resistant to cryptanalysis. PB - UIN SUNAN KALIJAGA YOGYAKARTA KW - Keywords : Advanced Encryption Standard KW - Avalanche Effect KW - Cryptography KW - Cipher Block KW - Exhaustive Key Search KW - Twofish. M1 - skripsi TI - ANALISIS PERBANDINGAN PERFORMANSI ALGORITMA Advance Encryption Standard (AES) dan Twofish PADA BLOK CIPHER AV - restricted ER -