scs image encryption

8/8/2019 Scs Image Encryption

1/14


2/14

Table of Contents1.Introduction

2.Overall Description

3.External Interface Requirements

4.System Features

5.Other Non-Funtional Requirements

6.DFD

7.Conclusion and Future scope

8.References


3/14

INTRODUCTIONy Steganography is a form ofsecurity through obscurity

y

Image steganography is the most widely used form ofsteganography.

y Two issues regarding steganographic algorithm

y Image distortion followed by steganographic process

y Complexity of the linear transforms used

y SCS image encryption is used to over come these issues


4/14

SCSImage Encryptiony It is a steganographic technique based on KL transform.

y Input data is compressed using KLT.

- To achieve higher concealing capacity.

y It is hidden in the LSB of carrier object.

y KLT require a great amount of processing time on larger set ofdata.

y This problem is resolved by dividing digital image in to blocks


5/14

Carrier & Stego Images

y Carrier image is the image chosen for encrypting the secret message(Pay load).

y Stego image is the image formed after encryption.

y Recovered message is the message recovered by the reciever.


6/14


7/14

External Interface Requirementsy User Interface

y Contains various screens like Initial screen , login screen, main form,help modules etc.

y Hardware Interfacey 256 Mb of RAM is recommended with a 15 mb of hard disk free space for

running this software.

y Software interfacey Java Run Time environment (JRE 1.5) version for running and operating

systems windows XP or higher is supported.

y Communication interfacey Sending side modules and receiving side modules using TCP/IP protocol are

also developing for safe and secure transmission.


8/14

System Featuresy Sender side

y Segmentation: Secret message is segmented before compression toachieve concealing capacity and execution time.

y Compression: KL transform based compression technique is usedfor compressing the segmented image. This reduces the energyloses as in the case of DCT.

y Hide image:


9/14

System Features.Contdy Receiver Side

y Retrieve Message: The receiving module in the receiver side receivesthe sent message and passed for decryption

y Decryption: Decryption is exactly the reverse process of hidingprocess. Extract the hidden data from the LSB of stego image.


10/14

Other Non Functional

requirementsy Performance

y RAM should be 128 MB, 256 MB is recommended with a minium freespace of 15 MB is required for storage and execution.

y Safetyy The size of the secret message will not exceed the maximum limit,

otherwise the extra data will be truncated.y Security

y First administrator account is created and then admin can create otheruser account. Password reset mechanism is also provided.

y Software quality attributesy Software is developed such that its easy to extend and the software

should be user friendly.y Business rules

y User must satisfy the terms and conditions of the software. It should beused for intended purposes only.


11/14

Data Flow Diagram


12/14

Data Flow DiagramLevel 2 DFD


13/14

Conclusion and Future scopey The SCSA is a powerful algorithm in terms of

y Execution time, concealing capacity, compression rate, stego imageand recovered message quality.

y It is a good candidate for the use on multicore architecture

y It is beneficial in implementing algorithm on mobile deviceswith video and image processing capabilities.

y The algorithm is applicable only to images.


14/14

Referencesy http://www.jjtc.com/steganography

y en.wikipedia.org/wiki/steganography

y http://www.garykessler.net/library/steganography.html

y http://www.computerworld.com

y Segment Compression Steganographic AlgorithmDaniela Stanescu,Ioan-Gabriel Bucur, Mircea Stratulat,IEEE International JointConferences on Computational Cybernetics and Technical Informatics(ICCC-CONTI 2010) May 27-29, 2010 Timisora, Romania.

scs image encryption

Documents