comparison of watermarking and cryptogrphy

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SAVEETHA SCHOOL OF ENGINEERING

• SAVEETHA UNIVERSITYCHENNAI602105
• DEPARTMENT OF ELECTRONICS AND COMMUNICATION
  ENGINEERING

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COMPARISON OF WATERMARKING WITH CRYPTOGRAPHY

• DONE BY,
• POOJA SHUKLA
• PRIYANKA RANJAN
• SONAM TIWARI
• 
  
• 
  

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AIM

• To compare watermarking with cryptography
• To compare the relative advantages and
  disadvantages
• To provide security needs as well as extra layer
  of authentication

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ABSTRACT

• Watermarking is a technique for labelling digital
  pictures by hiding secret information into the
  images.
• Cryptography is a scheme of protecting
  information by transforming it into an unreadable
  format.

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EXISTING METHODOLOGY

• Cryptography is a secret sharing scheme which
  independently disclose no information about the
  original secret image

• Cryptography can be applied to,
• TEXT
• CODE
• IMAGES

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PROPOSED SYSTEM

• Watermarking uses electronic stamps which is used
  for labeling digital pictures by hiding secret
  information into the images.

• Water Marking can be applied to,
• IMAGES
• TEXT
• AUDIO
• VIDEO

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BLOCK DIAGRAM

• IMAGE WATERMARKING

WATERMARKED IMAGE
ORIGINAL IMAGE
WATERMARK
INVERSE DWT
EMBEDDING PROCESS
DWT
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IMAGE CRYPTOGRAPHY
KEY
INVERSE KEY
ENCRYPTION
DECRYPTION
IMAGE
SECRET IMAGE
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TEXT WATERMARKING
TEXT
SECRET TEXT
EMBEDDING
ENCRYPTION
EXTR-ACTION
DECRYPTION
KEY
INVERSE KEY
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• TEXT CRYPTOGRAPHY

KEY
INVERSE KEY
CIPHER TEXT
PLAIN TEXT
PLAIN TEXT
ENCRYPTION
DECRYPTION
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GENERAL COMPARISON

• WATERMARKING
• 1. Watermarking is about robustness against
  possible attacks
• 2. Uses steganography techniques
• 3. Gives more privacy

• CRYPTOGRAPHY
• 1. Cryptography is about protecting the meaning
  of the document
• 2. Uses biometrics techniques
• 3. No privacy

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ADVANTAGES
WATERMARKING

• Undetectable and Undeletable by hackers
• Resistant to lossy data compression
• EXAMPLE JPEG
• Resistant to image manipulation and processing
  operations
• EXAMPLE cut-copy-paste
• Privacy
• Security
• Cost and Capacity
• Recoverable and Reversible

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CRYPTOGRAPHY

• Message secure algorithm
• Security parameter
• Secure keying
• Not transmitted to anyone
• Enables use of DIGITAL CERTIFICATES
• Fully automated
• High speed

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APPLICATIONS
WATERMARKING

• Copyright protection
• Prevention of unauthorized copying
• Authentication
• Media Bridging
• Broadcast Monitoring
• Fingerprinting
• Secret Communication
• Determination of ownership

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CRYPTOGRAPHY

• Secrecy in transmission and storage
• Integrity in transmission and storage
• Authentication of identity
• Credentialing system
• System using changing key
• Hardware support

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PROPERTIES
WATERMARKING

• Perceptually Invisible
• Robustness
• Embedding Effectiveness
• Data Payload
• Blind and Informed Detection
• High bit rate

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CRYPTOGRAPHY

• Image resistance
• Message authentication codes
• Accessibility
• Cryptokey security
• Protection
• Exportable and Removable
• Unique owner

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REQUIREMENTS

• Requirements vary with application. For example,
• Perceptually transparent - must not perceptually
  degrade original content.
• Robust survive accidental of malicious
  attempts at removal.
• Oblivious or Non-oblivious recoverable with or
  without access to original.
• Capacity number of watermark bits embedded.
• Efficient encoding and decoding.

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WATERMARKING TECHNIQUES

1. Embedding Locations
2. Robust Watermarking
3. Fragile Watermarking
4. Semi-Fragile Watermarking
5. Configuration of Cover Work by Watermark
   Embedding
6. Watermarking Domains

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CRYPTOGRAPHY TECHNIQUES

1. Hash Techniques
2. Symmetric Key Cryptography
3. Asymmetric Key Cryptography

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BASIC FREQUENCY DOMAIN

• DISCRETE FREQUENCY TRANSFORM
• DISCRETE COSINE TRANSFORM
• DISCRETE WAVELET TRANSFORM

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PARAMETERS

• PSNR
• SNR
• Transformation Method
• Image Format
• Quality Factor
• Kemel size
• Security Parameter
• Embedding Parameter
• Detection Parameter

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WATERMARKING CONTENT
ORIGINAL IMAGE
SECRET IMAGE
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WATERMARKED IMAGE
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CRYPTOGRAPHED CONTENT
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Share 1 Share 2
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CONCLUSION
CRYPTOGRAPHY

• Detecting and decoding the hidden data within a
  given medium.
• Even if secret content is not revealed, modifying
  the cover medium changes the mediums statistical
  properties.
• Distributed Dictionary Attack

WATERMARKING

• It deals with possible attacks and protects the
  content.
• Once you try to hack the secret the whole content
  gets destroy.

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FUTURE WORKS

• The most important use of CRYPTOGRAPHY techniques
  will probably lie in the field of digital
  watermarking.
• It may become limited under laws - governments
  claimed that criminals use CRYPTOGRAPHY AND
  WATERMARKING to communicate.

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LITERATURE SURVEY

• Independent watermarking classification by
  Dittmann, J., Mukherjee, A., Steinebach, M.
  (2000, March 27 - 29).
• Applied cryptography by Wiley and Sons, 1996.

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REFERENCE

• Hidden Digital Watermarks in Images by Chiou-Ting
  Hsu and Ja-Ling Wu, Senior Member, IEEE
• A Feature-Based Robust Digital Image Watermarking
  Scheme by Chih-Wei Tang and Hsueh-Ming Hang,
  Fellow, IEEE
• Comparison Of Visual Cryptography Schemes by M.
  Amarnath Reddy, IJEST

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THANK U.!!!!!!
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