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Tiara Reventina Sinurat Pengarang Alfonsus Situmorang, S.Si., M.Kom Dosen Pembimbing 1 Drs.Posma Lumbanraja, M.Si Dosen Pembimbing 2 Imelda Sinaga S.Si., M.Kom Penguji 1 Harlen Gilbert Manullang, S.Kom., M.Kom Penguji 2

ABSTRACT One of the academic activities that exist in schools in general every time before a new school year is, of course, the process of admitting new students. So far, all data is recorded manually and allows data to be copied by certain parties to be misused. This is very vulnerable and makes it possible to deliberately intercept and change data to the detriment of the data owner. For this reason, we need a system that has a level of security that can guarantee that efforts that can be made to maintain the security and confidentiality of data are to encrypt the original data and insert data into a medium by applying cryptography which converts the original data into unicode form with certain rules To facilitate the registration process and secure the data of students who will register, a new admissions application system is needed that uses layered data security techniques by combining symmetric cryptographic algorithms with the Advanced Encryption Standard (AES) Algorithm and the One Time Pad (OTP) Algorithm. This system is built on a web basis, with the PHP programming language and MySQL as the database. From the results of the combination of algorithms, it has resulted in layered data security which is able to restore the ciphertext into the original text data as a whole and is able to convert the original data into ciphertext. Keywords: Acceptance of New Students, AES Algorithm, OTP Algorithm, Security, PHP.