<![CDATA[Keamanan data digital, khususnya gambar digital, menjadi aspek krusial dalam proses pertukaran informasi melalui jaringan internet. Penelitian ini bertujuan untuk merancang dan mengembangkan sebuah sistem berbasis web yang mengimplementasikan algoritma Triple Data Encryption Standard (Triple DES) dalam proses enkripsi dan dekripsi citra digital. Sebelum dilakukan proses kriptografi, citra digital terlebih dahulu dikonversi ke dalam format representasi teks menggunakan metode encoding Base64. Sistem dikembangkan menggunakan metode Waterfall serta teknologi HTML, CSS, JavaScript, dan pustaka CryptoJS. Hasil implementasi menunjukkan bahwa sistem mampu melakukan proses enkripsi dan dekripsi dengan tingkat keakuratan yang tinggi, selama kunci yang digunakan sesuai. Berdasarkan pengujian, sistem menunjukkan sensitivitas signifikan terhadap perubahan kunci dan terdapat peningkatan ukuran file akibat proses konversi. Selain itu, sistem telah diuji terhadap potensi serangan kriptografi umum dan dilengkapi mekanisme keamanan tambahan, seperti pembatasan percobaan kunci. Dengan demikian, sistem ini dapat dijadikan solusi efektif dalam menjaga kerahasiaan citra digital selama proses transmisi data secara daring. The security of digital data, particularly digital images, is a critical concern in the process of information exchange over internet-based networks. This study aims to design and develop a web-based system that implements the Triple Data Encryption Standard (Triple DES) algorithm for the encryption and decryption of digital images. Prior to the cryptographic process, the digital image is first converted into a text-based representation format using the Base64 encoding method. The system was developed using the Waterfall model along with HTML, CSS, JavaScript technologies, and the CryptoJS library. Implementation results indicate that the system can perform encryption and decryption processes with a high degree of accuracy, provided the correct key is used. Testing revealed that the system exhibits significant sensitivity to changes in the key, as well as an increase in file size due to the conversion process. Additionally, the system was evaluated against common cryptographic attacks and is equipped with enhanced security mechanisms, such as key input attempt limitations. Therefore, this system offers an effective solution for preserving the confidentiality of digital images during online data transmission.]]>
