<![CDATA[The increasing use of web-based information systems by Internet Service Providers (ISPs) has increased the need to protect customers' personal data from unauthorized access and misuse. This study aims to implement the Advanced Encryption Standard (AES-128) algorithm in Cipher Block Chaining (CBC) mode to improve customer data security in a web-based WiFi provider information system. The system was developed using the Waterfall method, including requirement analysis, system design, implementation, testing, and maintenance. Customer data were encrypted before being stored in the database and decrypted when users with access rights can view it. System validation was conducted using White Box Testing with the Path Testing technique. Based on the test results, the plaintext "ANDARA1234567890" can be processed into the ciphertext "539E82687FC3424ADA78E95A877AE37E7DE45E3AEA0B76E97D26D3C15152E74B" using the AES-128 algorithm in CBC mode. Through the decryption process, the ciphertext can be restored to its original plaintext form without altering the data, while all independent paths can be executed according to the logic flow designed for the program. Therefore, the implementation of AES-128 in CBC mode supports the confidentiality of customer data in a web-based WiFi provider information system through the applied encryption mechanism.]]>
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