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 the
data 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 medical
history from people who have no right to know let alone manipulate the data. To provide a
guarantee of stronger confidentiality, it is necessary to use a cryptographic system in the form of
super encryption, one of which is collaboration between Vigenere Cipher and AES-128-CBC. For
the implementation of super encryption, an encryption and decryption function is added to the
web-based medical record information system. Meanwhile, to determine the encryption quality of
the super encryption cryptographic system, an experiment was carried out by comparing the size
of 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 by
the cryptographic system with Super Encryption Vigenere Cipher and AES-128-CBC have the
advantage of correlation and entropy values, but still have a longer processing time than using 1
algorithm.
Keywords— aes, cryptography, medical record, super encryption, vigenere