Data Hiding in Encrypted H.264/AVC
Video Streams by Codeword Substitution
Abstract: Steganography is the art of hiding the fact that communication is taking
place, by hiding information in other information. Many different carrier file
formats can be used, but digital Videos are the most popular because of their
frequency on the Internet. For hiding secret information in Videos, there exists a
large variety of steganographic techniques some are more complex than others and
all of them have respective strong and weak points. Digital video sometimes needs
to be stored and processed in an encrypted format to maintain security and privacy.
For the purpose of content notation and/or tampering detection, it is necessary to
perform data hiding in these encrypted videos. In this way, data hiding in
encrypted domain without decryption preserves the confidentiality of the content.
In addition, it is more efficient without decryption followed by data hiding and reencryption. The codeword’s of residual coefficients are encrypted with stream
ciphers. Then, a data hider may embed additional data in the encrypted domain by
using codeword substitution technique, without knowing the original video
content. In order to adapt to different application scenarios, data extraction can be
done either in the encrypted domain or in the decrypted domain. Furthermore,
video file size is strictly preserved even after encryption and data embedding.
Experimental results have demonstrated the feasibility and efficiency of the
proposed scheme. The capability of performing data hiding directly in encrypted
H.264/AVC video streams would avoid the leakage of video content
Existing System: The data hiding is performed directly in encrypted H.264/AVC video bit
stream.
 The scheme can ensure both the format compliance and the strict file size
preservation.
 The scheme can be applied to two different application scenarios by
extracting the hidden data either from the encrypted video stream or from
the decrypted video stream.
 Encryption and data hiding are accomplished almost simultaneously during
H.264/AVC encoding process
Disadvantages: JPEG2000 images works have been focused on image
 IPM (Intra-Prediction Mode) does not exist in the actual standard.
 It not support advance concepts stenography.
Proposed System: JPEG2000 images works have been focused on image. With the increasing
demands of providing video data security and privacy protection
 Data hiding in encrypted H.264/AVC videos will undoubtedly become
popular in the near future. Obviously, due to the constraint of the
underlying encryption
 An H.264/AVC video encryption scheme with good performance including
security
 Analyzing the property of H.264/AVC codec, three sensitive parts (i.e.,
IPMs, MVDs, and residual coefficients) are encrypted with stream ciphers
Advantages: Data hiding: Data hiding is also known as data encapsulation or information
hiding
 Encrypted domain: encrypted using an encryption algorithm, generating
cipher text that can only be read if decrypted
 codeword : a code word is an element of a standardized code or protocol
 Substituting: Substitution allows for recursive evaluation through macro
templates
Hardware Requirements: SYSTEM
: Pentium IV 2.4 GHz
 HARD DISK
: 40 GB
 RAM
: 256 MB
Software Requirements: Operating system
:
Windows XP Professional
 IDE
:
Microsoft Visual Studio .Net 2010
 Database
:
Sql server 2005
 Coding Language
:
C#.NET