Abstract:
Cryptography and Steganography are the two popular methods available to provide security. Recently a combination between them becomes the most successful ways to maintain confidentiality of data but with impact on quality. LSB is a common method to hide data but it is easy for attacker to extract the hidden message. This thesis concentrates and focuses on the impact of encryption (both symmetric and asymmetric) on the quality of hiding messages in audio files. An LSB method has been developed to avoid the lack of quality. It is clear from the evaluation of the results that both symmetric and asymmetric encryption affect the quality of hiding data by 0.02 and 6.98 %, respectively, compared with hiding plaintexts. It is also found that the proposed method, AFT_LSB, has increased and improved the quality of hiding messages compared with standards LSB.
