İletişim ve saklama için kısmi video şifreleme


Tezin Türü: Yüksek Lisans

Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Türkiye

Tezin Onay Tarihi: 2003

Tezin Dili: İngilizce

Öğrenci: Turan Yüksel

Eş Danışman: FATOŞ TUNAY YARMAN VURAL, Fatoş Vural

Özet:

In this study, a new method is proposed to protect video data through partial encryption. Unlike previous methods, the bit rate of the encrypted portion can be controlled. In order to accomplish this task, a simple model for the time to break the partial encryption by a chipertext-only attack is defined. Then, the encrypted bit budget distribution strategy maximizing the time subject to the bitrate constraint is found. An algorithm to estimate the model parameters is constructed and it isthen implemented over an MPEG-4 natural video codec together with the bit budget distribution strategy. The encoder is tested with various image sequences and the output is analyzed. In addition to the developed video encryption method, a file format is defined to store encryption related side information.