It is a form of secure communication of data using biometrics

1. Guided by:
V. Sree lakshmi
(Snr Assistant Professor)
Submitted By :
N.S.Srimadhur(10B81A04A0)
D.Sri Hari Priya(10B81A0499)
D.Vishwa Teja(10B81A04D8)

2.  Steganography is the art of hiding the existence of data in
another transmission medium to achieve secret communication.
It does not replace cryptography but rather boosts the security
using its obscurity features.
 The word steganography is of Greek origin and means
"concealed writing" from the Greek words steganos meaning
"covered or protected", and graphein meaning "writing".
 “Steganography means hiding one piece of
data within another”.

3.  Steganography method used in this paper is based on
biometrics.
 Here secret data is embedded within skin region of image
that will provide an excellent secure location for data hiding.
 For this skin tone detection is performed using HSV (Hue,
Saturation and Value) color space.
 Additionally secret data embedding is performed using
frequency domain approach - DWT (Discrete Wavelet
Transform).

5.  Carrier or Cover File - A Original message or a file in
which hidden information will be stored inside of it .
 Stego-Medium - The medium in which the information is
hidden.
 Embedded or Payload - The information which is to be
hidden or concealed.
 Steganalysis - The process of detecting hidden information
inside a file.

6. Carrier Image Image to be embedded

8.  Proposed method introduces a new method of embedding secret
data within skin as it is not that much sensitive to HVS (Human
Visual System).
 This takes advantage of Biometrics features such as skin tone,
instead of embedding data anywhere in image, data will be
embedded in selected regions.

10. Types of morphological operations:
 Dilation
 Erosion
 Opening
 Closing

11. The structuring element taken here is disk structure of radius
r= 3
Neighborhood:
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1

12.  It is typically applied to binary images,
but there are versions that work on gray
scale images.
 The erosion of A by the structuring
element B is defined by:
 The erosion of A by B is the set of all
displacements, z, such that and A if atleast
1 element coincides with background
value then that value sets to background
pixel.
Common Names: Erode,
Shrink, Reduce

13.  It is typically applied to binary images,
but there are versions that work on gray
scale images.
 The dilation of A by the structuring
element B is defined by:
 The dilation of A by B is the set of all
displacements, z, such that and A overlap
by at least 1 element Thus, Set B is
referred to as the structuring element in
dilation.
Common Names:
Dilate, Grow,
Expand

14. Opening:
smooth the contour of an object, break narrow isthmuses,
and eliminate thin protrusions.
The opening A by B is the erosion of A by B, followed by a
dilation of the result by B
Closing:
smooth sections of contours but it generally fuses narrow
breaks and long thing gulfs, eliminates small holes, and fills
gaps in the contour.

20. DWT splits component into numerous frequency bands called
sub bands known as
 LL – Horizontally and vertically low pass
 LH – Horizontally low pass and vertically high pass
 HL - Horizontally high pass and vertically low pass
 HH - Horizontally and vertically high pass.
 we hide secret message in other three parts without making
any alteration in LL sub band.
DWT used in this work is Haar-DWT, the simplest DWT.

21. Cropped
image
Perfor
m DWT
Embeddi
ng in B-
plane
Secret
logo
Perform
IDWT
Croppe
d stego
image
Merging
with
original
image
Stego
image

24. Load
stego
image
Perform
skin
detectio
n
Crop
the
image
Perform
DWT
retrievalSecret data

26.  The phrase peak signal-to-noise ratio, often abbreviated
PSNR, is an engineering term for the ratio between the
maximum possible power of a signal and the power of
corrupting noise that affects the fidelity of its representation.

27. The health care, and especially medical imaging systems,
may very much benefit from information hiding techniques.
It is used for DIGITAL SIGNATURE AUTHENTICATION
to prevent malicious tampering of private and confidential
documents. These documents include company memos,
Emails and letters.
It can also be implemented for identity proofs as personal
details can be embedded in face.

28. In this paper biometric steganography is presented that uses
skin region of images in DWT domain for embedding secret
data. By embedding data in only certain region (here skin
region) and not in whole image security is enhanced. Also
image cropping concept introduced, maintains security at
respectable level since no one can extract message without
having value of cropped region.

29. Any queries ?