This document discusses encryption and decryption processes. Encryption converts plaintext into ciphertext using a key, while decryption reverses this process to convert ciphertext back to plaintext using the same key. The document was developed by four students and submitted to their professor for a class project on providing security through file, communication, and network encryption using encryption/decryption techniques. It outlines the feasibility study, methodology, and system requirements for the project.

1. Text
Encryption and Decryption
Developed By:
Shashi Kr. Singh (1150986)
Sandeep Prasad (1150980)
Sumit Kumar (1150994)
Rishabh Anand (1150967)
Submitted To:
Rupinder Kaur Gurm
Department of Computer Science
RIMT-Institute of Engineering & Technology
Punjab ( India.)

2. Table of Content
1. Introduction
2. Text Encryption
3. Text Decryption
4. Feasibility-Study
5. Methodology
6. Purpose of Project
7. System Requirements

3.  The process of converting plaintext into
ciphertext
 The process of converting ciphertext into
plaintext
Introduction
Encryption
plaintext
message
ciphertext
message
Encryption
Decryption
Decryption

4. • Encryption is a process whereby
plaintext is converted into or ciphertext.
Encryption
Plaintext X Ciphertext Y
Key K
Text Encryption
 The original unaltered contents of the
message or text is called plaintext.

5. • Decryption is the reverse process of
encryption or encipherment, which is to
convert ciphertext back to its original form of
plaintext.
Decryption
Ciphertext Y Plaintext X
Key K
Text Decryption
The altered text after encryption is called as
enciphered text or ciphertext.

6. • Decryption process needs to use the same key
that is used in the encryption process to obtain
the original plaintext.
• Although one may obtain a copy of the
encrypted message, one must use the correct
key to successfully decrypt the message.
Text Decryption

7. Feasibility-Study

8. Methodology

9. Purpose of Project
• Provides security
• File encryption
• Communication encryption
• Network traffic encryption
• Password manager
• Single sign-on

10. System Requirements
• Turbo C & C++ and Dev-C
• Works on Windows 7, XP, Vista and 8
• Works on 64 bit Windows & 32 bit Windows
• Mac OS X 10.3 and above
Software Requirements
Hardware Requirements
• Intel Pentium 4 or above
• Floppy-Drive
• CD-ROM drive
• 10 GB of free hard-disk
• keyboard and mouse
• RAM(minimum 512 MB)

11. Friends….
Any Question ?