Implementasi Kriptografi Menggunakan Kombinasi Hill, Affine dan Stream Cipher dalam Mengamankan Data Teks

In this time of rapid digital development, prone to information leakage, data protection is one aspect that cannot be ignored. Vulnerability to harmful attacks encourages the implementation of more secure data protection methods. One solution that can be used in maintaining data confidentiality is by using cryptographic techniques. Cryptography is a technique for masking messages, data, or information that can only be accessed by certain parties. In this research focuses on encrypting text data by combining three cryptographic algorithms, namely the Hill Cipher, Affine Cipher and Stream Cipher algorithms. The encryption process starts by using Hill Cipher, then the encryption results are re-encrypted using Affine Cipher, and finally re-encrypted with Stream Cipher. In the decryption process, the encrypted data is first decrypted with Stream Cipher, then continued with Affine Cipher, and ended with Hill Cipher. This research produces two Python GUI programs for encryption and decryption of text data.