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Presented By: Aryasindhu Sahu Steganography : A Modern Approach To Digital security Syntech 2010 , SIET Dhenkanal Presented By: Aryasindhu Sahu

The art of hiding information inside information. stegos graphia + Steganography Covered Writing The art of hiding information inside information. http://aryasindhu.blogspot.com/p/innovations.html

"Since everyone can read, encoding text in neutral sentences is doubtfully effective." SECRET INSIDE http://aryasindhu.blogspot.com/p/innovations.html

Historical Facts Ancient Greeks used wax on wood World War 2 – use of Invisible Inks Old Paintings – symbols and signs http://aryasindhu.blogspot.com/p/innovations.html

Modern Steganography Text Injection File Embedding Digital Watermarking Copyright Marking Data Encryption LSB Editing http://aryasindhu.blogspot.com/p/innovations.html

Hiding Several Messages: Deniable Cryptography Knowledge of encrypted data No proof how much information is stored Digital Watermarking: Not really hiding information Important: Not modifiable Uses the hiding property of Steganography Recent: MPAA hides watermarks in movies. http://aryasindhu.blogspot.com/p/innovations.html

Implementations CODEBOOK Original Document Marked Document ENCODER http://aryasindhu.blogspot.com/p/innovations.html

Steganography Implementations Texts / Web ages Images Audios Videos Digital Equipments Implementations Steganography http://aryasindhu.blogspot.com/p/innovations.html

Implementations Texts or Web Pages Use of codebooks Layout of text Every Nth character Use of whitespaces and newlines Difficult to detect and decode http://aryasindhu.blogspot.com/p/innovations.html

Implementations Images Cover Images Identifying Redundant data Replace (a subset of ) redundant bits with data http://aryasindhu.blogspot.com/p/innovations.html

Implementations Audios Frequencies inaudible to human Embedding data using LSB Encoding musical tones http://aryasindhu.blogspot.com/p/innovations.html

Implementations Videos Visible signals Using Image Steganography Using Audio Steganography http://aryasindhu.blogspot.com/p/innovations.html

Example of Image Steganography 255,0,0 11111111 , 00000000 , 00000000 255,0,1 11111111 , 00000000 , 00000001 254,1,0 11111110 , 00000001 , 00000000 Secret data is encrypted at the positions of LSB and decrypted at the recipient. A little change in the LSB puts very less effect on the pixel. So we are unable to identify the steganographic images. http://aryasindhu.blogspot.com/p/innovations.html

Modern use of Steganography In modern printers Digital Images Email Encryption Document Password Protection Website Security Digital Watermarking SAFDB (Steganography Application Fingerprint Database) http://aryasindhu.blogspot.com/p/innovations.html

Detection Of Steganography In Text or Web Pages Look for (disturbing of) patterns Odd use of language Line heights and whitespaces http://aryasindhu.blogspot.com/p/innovations.html

Detection Of Steganography In Images Examine color palette Size of the image Differences: − Format − Last modified date Statistical analysis Analyze frequency of DCT (discrete cosine transform) coefficients Entropy of redundant data − Hidden content higher entropy Apply filters to steganograms Visible representation of statistical data http://aryasindhu.blogspot.com/p/innovations.html

Detection Of Steganography In Audios Statistical analysis Analyze patterns in background noise Distortions Measure inaudible frequencies http://aryasindhu.blogspot.com/p/innovations.html

Detection Of Steganography In Videos Look for distinguishing movements Same techniques as with images Same techniques as with audio http://aryasindhu.blogspot.com/p/innovations.html

Defeating Steganography Text Images ● Change spacing ● Modify line heights, layout ● Add or remove words ● Compress with lossy compression ● Convert to different format ● Resize the image ● Modify colors Audios Videos ● Compress with lossy compression ● Change bit rate ● Alter / limit frequency spectrum ● Same techniques as with images ● Same techniques as with audio http://aryasindhu.blogspot.com/p/innovations.html

Comparison of Secret Communication Technique Confidentiality Integrity Unremovability Encryption Yes No Digital Signature Steganography Yes/No http://aryasindhu.blogspot.com/p/innovations.html

Terrorism & Steganography Terror groups hide behind web encryption. Uncrackable encryption is allowing terrorism. Example : Emails from Al-Qaida or Laden Group after Sept 11 attack. http://aryasindhu.blogspot.com/p/innovations.html

Conclusion Seamless Security Hide data practically everywhere Hidden Watermarking Data Stealing reduced Detection of Steganography − Possible, but can be difficult Defeating Steganography is not hard http://aryasindhu.blogspot.com/p/innovations.html

QUESTIONS ? http://aryasindhu.blogspot.com/p/innovations.html