الفهرس 
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Abstract
Android-based smartphones have gained immense popularity over the years and are definitely more popular than other operating system phones. However, it is necessary to secure the sensitive data and files that stored in the Android-based devices. In particular, there are several of applications available nowadays in the Google Play store or other app stores. Many suspicious applications try to access the sensitive data and important files. Several approaches proposed to keep unauthorized users away. Cryptography and steganography are two main methods to protect information from unauthorized users. Cryptography is the process to encrypt the data (plaintext) into encrypted data (ciphertext) by using a certain algorithm with secret key. The main goals of thesis: high confidentiality and more resisting against the cryptanalysis attacks in Android-based devices. The two goals are carried out by using the efficient direction of achieving information security which termed as DNA-Based cryptography and One-Time pad (OTP) key that generated randomly.