Expert system is a system that seeks to adopt human knowledge into computers, so that computers can solve problems like experts do. ENT (ears, nose, and throat) are organs that are closely interconnected. Abnormalities in these organs are diagnosed and treated by a specialist doctor. One of the functions of these organs such as the ear. The ear is an organ for hearing and balance consisting of the outer ear, middle ear and inner ear. The function of the nose, the nose is the olfactory organ and the main way in and out of air, the nose also provides additional sound resonance and is a place for paranasal sinuses and tear ducts. While the function of the throat is a muscular duct where the food goes to the esophagus and where the air travels to the lungs. In this study, an expert system was built to detect and be equipped with a certainty value of the diagnosis. The certainty value is obtained using the Certainty Factor (CF) method.

Contraception is an action to prevent pregnancy. Where currently there are enough tools, methods and types of contraceptives for men or women, implementation can be done in two ways, namely using contraceptive aids or without contraception. The problem that occurs in BKKBN and women's empowerment is the selection of good contraceptives used which still uses a simple computerized system that is using Microsoft Excel applications in the processing process. In solving this problem, the author uses the Analytical Hierarchy Process method to describe the weights that fit the criteria that are appropriate for the selection of family planning tools that are well used in BKKBN and women's empowerment. Analytical Hierarchy Process or often called AHP is a technique for decision making in determining the best choice from several alternatives. AHP is a mathematical model procedure that is well suited for the evaluation of qualitative attributes. These attributes are mathematically quantified in a set of comparisons in pairs. The advantages of the AHP method when compared to other decision-making methods is to have a hierarchical structure as an impact of the criteria taken, to the very detailed and detailed sub criteria

Kriptografi merupakan salah satu solusi yang dapat dimanfaatkan dan dikembangkan dalam menghadapi permasalahan tentang keamanan data. Salah satu algoritma yang bisa dihandalkan dalam keamanan data adalah algoritma Rijndael. Algoritma Rijndael merupakan algoritma kriptografi simetrik yang beroperasi dalam mode penyandi blok (block cipher) yang memproses blok data 128-bit dengan panjang kunci 128 bit, 192 bit, atau 256 bit.Untuk menjamin keamanan dan keutuhan dari suatu data, dibutuhkan suatu proses penyandian,  dengan melakukan proses enkripsi dan dekripsi. Proses enkripsi ini akan mengubah suatu data asal atau asli menjadi data rahasia yang tidak dapat dibaca. Sementara itu, proses dekripsi dilakukan oleh penerima data yang dikirim tersebut. Data rahasia yang diterima akan diubah kembali menjadi data asal atau asli. Dengan cara penyandian tadi, data asli tidak akan terbaca oleh pihak yang tidak berkepentingan, melainkan hanya oleh penerima yang memiliki kunci dekripsi.