This document discusses using Shamir's secret sharing algorithm and steganography to securely share secret images. The objectives are to provide more security for image communication while achieving transparency and preventing tampering. Shamir's algorithm is used to split images into shares, and steganography techniques like LSB encoding are used to hide the shares in cover images. This allows the shares to be transmitted securely without drawing attention. Potential applications include secure medical image sharing and military photography. The document reviews relevant literature and provides an example of a secret image being split and hidden in stego images. Future work could improve reconstruction quality and use additional cryptography techniques for enhanced security.

1. Secret Image Sharing
Guided By:-
Prof. Dr.Sonali Patil.

2. ----Problem Statement----
To Study image secret sharing using
Shamir’s secret sharing algorithm and
Steganography .

3. OBJECTIVES
 Providing more security for image
communication.
 To achieve transparency, authority
(resistance to various image tampering
and forgery methods), and high capacity
of the hidden data.

4.  Schemes are important tools in
cryptography and they are used as a
building box in many secure
protocols,threshold cryptography, access
control, attribute-based Encryption.
 Secret image sharing has become a key
technology for digital images in secured
storage and confidential transmission.
MOTIVATION

5. MOTIVATION
Image data is not secure over network
and
social networking sites.
Drawbacks in various secret sharing
algorithms.

6. Total image security and confidentiality
over transmission.
Hindrance to Image tampering.
Expected Outcome

7. LITERATURE SURVEY
Shamir’s Algorithm:-
Shamir developed a sharing method (a (t;
n)threshold scheme, t/n) for sharing a
secret image among n participants, such
that any t participants could cooperate to
reconstruct the secret image, while t−1 or
fewer participants could not.

8. LITERATURE SURVEY
Why Steganography???
1)Share images look like random noise
and thus draw attention of the malicious
users.
2)Confidentiality of the shares is realized
by Steganography.

9. LITERATURE SURVEY
What is Steganography:-
Steganography is the method used to hide
shares into natural looking cover images.
The dealer should select n natural looking
cover images of size 2W×2H to hide a
W×H secret image for a (k, n) secret
sharing scheme.

10. Steganographic Image

11. LITERATURE SURVEY
LSB Method:-
1)LSB method stands for “Least Significant
Bit Method”.
2) This method is used for embedding the
shares into the host images.
3)Share images are processed pixel by
pixel during embedding.

12. LITERATURE SURVEY
LSB Method continues…..
3)Share image pixel values are embedded
into corresponding 2×2 pixel groups called
cover blocks in cover image.
4)Therefore, two LSBs of each pixel in th
corresponding cover block is used to hide
the shared pixel with eight bits.

13. APPLICATIONS
1)Medical applications such telediagnosis
and to store electronic patient record
(EPR) in the medical image by
steganography.
2)Miltary applications such as, The
photographers who work in enemy areas
can use this system to transmit
photographs.

14. SECRET IMAGE SHAREING
A medical image to share

15. SHARES ARE GENERATED USING
ALGORITHM:-

16. STEGO IMAGES FOR THE SHARES:-

17. FUTURE SCOPE
Secret image sharing with Steganography
is that current space of analysis wherever
heap of scope exists.
The combination of both provides higher
levels of security to the information being
transmitted.

18. FUTURE SCOPE
The special attention is given to improve
the quality of the reconstructed image.
Cryptography techniques like RSA, AES
and hash functions can also be used with
steganography to provide more security.

19. REFERENCES
1)Sharing and hiding secret images with
size constraint Yu-Shan Wu, Chih-Ching
Thien, Ja-Chen Lin∗
2)Shamir A. How to share a secret.
Communication of the ACM
1979;22(11):612–3.
3)Medical image security and EPR hiding
using Shamir’s secret sharing scheme
Mustafa Ulutas, Güzin Ulutas , Vasif V.∗
Nabiyev

20. PRESENTED BY:-
SHRUTI T KULKARNI