ABSTRACT
The use of manual system of data
encryption and decryption has a damaging implication resultant on the images in
some companies and the negative impact this trend has had on the users of such
system. Much resource is lost annually by firms due to the uncontrolled and
unscientific nature of this system.
In this traditional system, to
guarantee privacy of information / communications between any two subscribes in
a network consisting of 1000 members, 499,500 secret keys would be necessary,
one for each possible combination of sender and receivers. Keys have been
distributed by a secure channel such as a trusted courier with an attached case
manual led to a wrist, a costly and time consuming method.
This particular project is set to
appraise already existing system by designing a better one which will
facilitate the level of satisfaction and competence in the challenges in
information technology.
CHAPTER
ONE
INTRODUCTION
The ongoing dilemma of digital age
is balancing convenience against security. Security is a system of safeguards
for protecting information technology against disasters, system failure, and
unauthorized access that can result in damage or loss. There are several
reports of the spammers, crawlers and hackers who break into people’s privacy
to gain illegal access to their data. These have posed greater challenges
on people who use database, transact online and internet users.
This project work is design to
embark on a security mechanism using computerized data encryption and
decryption system to resolve this problem.
Data encryption is the process of
altering readable data into unreadable form to prevent unauthorized access.
Encryption is able to use powerful mathematical concepts to create coded
messages that are virtually impossible to break. As one article point out,
it is easy to encrypt a message on a simple pc so that the biggest
computer in the world couldn’t decipher it without spending far more time on
the problem that exists in the life span of the entire universe.
There are two basic form of
encryption
Private Key and public key
Private key: Private key (symmetric)
encryption means that the same secret key is used by sender and receiver to
encrypt and decrypt a message. The encryption system (for “Data Encryption
Standard”) was adopted as a federal standard for private key encryption in
1976.
Public key: Public key encryption
means that two keys used a public key, which the receiver has made known before
hand to the sender who uses it to encrypt message, and a private key, which
only the receiver knows and
1.1
STATEMENT OF PROBLEM
Most networks or organizations
database inclined. For effective and conducive working atmosphere, their data
must be safeguarded to a reasonable extent. Data should be protected from
unauthorized alteration.
The manual method of ensuring
orderliness of movement of goods and information within the firm waste time,
consume large resource, high man-power utilization and slow decision support.
The result achieved is redundant, inaccurate and les satisfactory.
The use of a computerized system has
shown a complete balance for a security management in our contemporary age.
1.2
AIMS AND OBJECTIVE
The aims and objectives of this
study are as follows:
-
To reduce stress, time consumption and cost of operation involved in the manual
system.
-
To design a system to restrict unauthorized access to its data usage.
-
To appraise the standard of computer programming to greater height of
sophisticated and general comprehensibility.
-
To suggest security techniques which can create conducive working atmosphere
for organizations who are having data threatened.
1.3
PURPOSE OF THE STUDY
This project work is aimed at:
-
Investigating into the old system procedures and specifications so as to
appreciate their problem routines and finally design automated system.
-
Improving the response time and main output requirement in the security
-
Management.
-
Conversion of all the various system specifications obtained during the period
of investigation and analysis into series of instructions that can be carried
out by the system.
-
Preparing gross estimation of probable overall and direct benefit for each
possible alternatives.
-
Documenting the feasibility study in a report for users and system management.
1.4
SIGNIFICANT OF STUDY
The significant of this project work
is to, solve the problem, the world are facing in the manual system of data
encryption and decryption.
It is also to serve as an area of
reference for future project work for people intending to write on a related
scope of study.
To introduce the larger society the
service of the computer thereby giving for more efficient and effective data
encryption and decryption system.
1.5
SCOPE/ DELIMITATION
This particular work is limited to
the following:
-
Data encryption.
-
Data decryption.
-
Visual basic design.
-
Window platform.
1.6
LIMITATION/ CONSTRAINTS
During the study, I was confronted
with a lot of constraints that inadvertently posed some sort of inconvenience
on me during the project work.
I was financially incapacitated,
time, poor response and inadequate of pre-existing literature on data
encryption and decryption.
1.7
ASSUMPTIONS
It is assumed that encryption is
done at the transmitter ie the while decryption is done at the individual
receiver.
The program is in a window platform.
1.8
DEFINITION OF TERMS
Encryption is the processing of
altering readable data to unreadable form to prevent unauthorized access.
Decryption is the act of altering
the unreadable form so that you can have access to the data using the correct
procedure.
Data is unprocessed information
which cannot be used for decision making.
Security is the process or system of
safeguarding or protecting information technology against disaster, system
failures, and unauthorized access that can result in damage or loss.
Manual system ÷ manual system is an
old method and procedure of using human physical capabilities to achieve
result.
Information – This is the meaningful
processed data that an individual can gain knowledge for the purpose of making
a decision.
Design – is the structuring
construct of a system.
Implementation ÷ Implementation
consist of detailed time table (using scientific aids), details conversion
procedures and changeover procedure, including system testing.
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