ارائه روشی جدید در جهت رمزنگاری جزئی ویدئوی 264. H با حفظ کامل فرمت ویدئو
محورهای موضوعی : مهندسی برق و کامپیوتر
سامان رسولی‌فر
1
(دانشگاه فردوسی مشهد)
مرتضی خادمی
2
(دانشگاه فردوسی مشهد)
کلید واژه: استاندارد 264.H رمزنگاری جزئی ویدئو رمز دنباله‌ای EGEA LSE.,
چکیده مقاله :
استاندارد فشرده‌سازی 264.H یکی از جدیدترین استانداردهای فشرده‌سازی ویدئویی بوده و کارایی فشرده‌سازی آن در مقایسه با استانداردهای پیشین تا %50 بیشتر است. با توجه به مزایای این استاندارد و استفاده گسترده از آن در کاربردهای مختلف ویدئویی، ارائه راهکارهایی در زمینه ایجاد امنیت برای این استاندارد ویدئویی ضروری به نظر می‌رسد. در این مقاله روشی جدید در جهت رمزنگاری جزئی ویدئوی 264.H با حفظ کامل فرمت ویدئو ارائه شده است. در این روش پارامترهای تأثیرگذارتر بر بافت و محتوای حرکتی ویدئوی 264.H در حین عملیات فشرده‌سازی، رمزگذاری می‌گردند. بدین منظور پارامترهای PredMode4×4Intra، Intra Residual Data، Ref-Index و MVD توسط رمزهای دنباله‌ای رمزگذاری می‌گردند. روش رمزنگاری پیشنهادی از طریق کاهش حجم داده رمزشده، دارای کارایی رمزنگاری بسیار بالایی بوده، ضمن این که از امنیت ادراکی بالایی نیز برخوردار است. علاوه بر این نحوه انتخاب و رمزنگاری پارامترها در این روش به‌گونه‌ای می‌باشد که فرمت ویدئوی رمزشده به‌طور کامل حفظ شده و از این طریق در کاربردهای مختلف نظیر کاربردهای تجاری و تبلیغاتی قابل استفاده می‌باشد.
H.264 is the latest video compression standard and its compression efficiency is twice as much as previous standards. Due to the advantages of this standard and its widespread use in various video applications, the protection of this standard has become necessary. In this paper, a new partial encryption scheme is presented for H.264 video which keeps the video format unchanged. In this method, parameters with high sensitivity to H.264 video texture and motion components are encrypted during compression. That is, such parameters as Intra4x4PredMode, Intra Residual Data, Ref-Index and MVD are encrypted using stream ciphers. This encryption scheme obtains high encryption efficiency through reducing the encrypted data volume along with high perceptual security. In addition to these properties, parameter selection and encryption in the proposed method is implemented in a way that the encrypted video format is kept compliant and thus can be utilized in different applications such as commercial and entertainment applications.
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