Portal Publikasi Hasil Penelitian Dosen-Dosen STMIK IBBI (dikelola LPPM)
Publish No.:000137
Author:Stefen Agustinus
Institution:Sistem Informasi STMIK IBBI
Keyword:Quality of Service, Customer Satisfaction
Abstract:Data security technique known as cryptographic now influential and widespread use. There are a lot of cryptographic algorithms . The main problem encountered for a student taking this course is difficult to understand the workings of a cryptographic algorithm due to the complexity and involves a lot of calculations . CAST are block ciphers that are included in the family of the DES ( Data Encryption System), which uses substitution and permutation ( known as  Substitution Permutation Network or SPN ) in the calculation of the key and the encryption and decryption process . CAST algorithm itself there are two versions of the CAST - 128 and CAST - 256 both of which are divided into key length used . Key length in CAST maximum allowed is 128 bits or 16 characters . Additionally CAST - 128 allows key sizes vary from 40 bits to 128 bits with the addition of 8 - bit . The length of the plain text to be encrypted and decrypted is equal to 64 bits ( 8 characters ) and supports all kinds of plain text . This thesis describes the workings of the CAST - 128 , the design procedure CAST - 128 encryption from the calculation of the Key Schedule using Substitution Boxes ( S - Boxes ) , how the encryption and decryption algorithms in CAST - 128 , CAST implementation results of algorithm - 128 created a program that also functions as a learning program to understand the CAST - 128 algorithm with the process of the formation of the key , encryption and decryption algorithms CAST - 128
Publisher:STMIK IBBI
Contributor:Bayu Sunanda
Publish Date:14 Dec 13
Journal Title:STISI 2013