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It is easier to grow vegetables using hydroponic techniques in the era of globalization. In hydroponic techniques, the need for certain plants to grow is very important to note. Manually, controlling and checking conditions is difficult to measure, so a system that can check plant needs is needed. Internet of Things (IoT) is known to be used to manage hydroponic plants. The drawback of IoT is the use of the system in general, resulting in confusion in the process of detecting plant needs. In IoT, it is important to implement system security with the aim of limiting interested users. In this study, the IoT security process was carried out using cryptographic techniques, namely the 128-bit Advanced Encryption Standard (AES) algorithm. This algorithm was chosen because it has a safer encryption result compared to similar symmetrical algorithms such as Blowfish, Caesar cipher and faster than the Data Encryption Standard (DES). Cryptography is used in securing the input data for plant needs designed using the ESP 8266 version of the Arduino Uno SoC microcontroller. Several criteria for selected plant needs include Total Dissolve Solid (TDS), Potential Hydrogen (PH), temperature, and distance that have been captured through Sensors and stored in the database before cryptography processing. Experimental results to prove data security in the IoT system have been done by analyzing plaintext and ciphertext, calculating the Avalanche Effect (AE), entropy and Bit Error Ratio (BER) values. AE obtained 58.01% as the highest yield, the highest entropy was 6.3566 while all data resulted in BER = 0. Based on the results obtained, it can be concluded that 128-bit Advanced Encryption Standard (AES) cryptography on IoT systems is good and according to standards.

Advanced Encryption Standard (AES) 128 Bit untuk Keamanan Data Internet of Things (IoT) Tanaman Hidroponik