IMPLEMENTASI KRIPTOGRAFI SUPERENKRIPSI VIGENERE CIPHER DAN ADVANCED ENCRYTION STANDARD (AES) PADA PENGAMANAN DATA RIWAYAT PASIEN RUMAH SAKIT

Abstract

Medical records are documents that contain patient's medical history data, where thedata needs to be guaranteed confidentiality in the processing of data through information systems.By utilizing cryptography, the information system can secure information on the patient's medicalhistory from people who have no right to know let alone manipulate the data. To provide aguarantee of stronger confidentiality, it is necessary to use a cryptographic system in the form ofsuper encryption, one of which is collaboration between Vigenere Cipher and AES-128-CBC. Forthe implementation of super encryption, an encryption and decryption function is added to theweb-based medical record information system. Meanwhile, to determine the encryption quality ofthe super encryption cryptographic system, an experiment was carried out by comparing the sizeof the plaintext sample file with the ciphertext, comparing the time of encryption and decryption,entropy values, correlation values and histogram graphics. The experimental results obtained bythe cryptographic system with Super Encryption Vigenere Cipher and AES-128-CBC have theadvantage of correlation and entropy values, but still have a longer processing time than using 1algorithm.Keywords— aes, cryptography, medical record, super encryption, vigenere