Cryptography Benefits & Drawbacks

CRYPTOGRAPHY BENEFITS & DRAWBACKS
http://www.tutorialspoint.com/cryptography/benefits_and_drawbacks.htm Copyright © tutorialspoint.com
Nowadays, the networks have gone global and information has taken the digital form of bits and
bytes. Critical information now gets stored, processed and transmitted in digital form on computer
systems and open communication channels.
Since information plays such a vital role, adversaries are targeting the computer systems and
open communication channels to either steal the sensitive information or to disrupt the critical
information system.
Modern cryptography provides a robust set of techniques to ensure that the malevolent intentions
of the adversary are thwarted while ensuring the legitimate users get access to information. Here
in this chapter, we will discuss the benefits that we draw from cryptography, its limitations, as well
as the future of cryptography.
Cryptography – Benefits
Cryptography is an essential information security tool. It provides the four most basic services of
information security −
Confidentiality − Encryption technique can guard the information and communication

from unauthorized revelation and access of information.
Authentication − The cryptographic techniques such as MAC and digital signatures can
protect information against spoofing and forgeries.
Data Integrity − The cryptographic hash functions are playing vital role in assuring the
users about the data integrity.
Non-repudiation − The digital signature provides the non-repudiation service to guard

against the dispute that may arise due to denial of passing message by the sender.
All these fundamental services offered by cryptography has enabled the conduct of business over
the networks using the computer systems in extremely efficient and effective manner.
Cryptography – Drawbacks
Apart from the four fundamental elements of information security, there are other issues that
affect the effective use of information −
A strongly encrypted, authentic, and digitally signed information can be difficult to access
even for a legitimate user at a crucial time of decision-making. The network or the
computer system can be attacked and rendered non-functional by an intruder.
High availability, one of the fundamental aspects of information security, cannot be

ensured through the use of cryptography. Other methods are needed to guard against the
threats such as denial of service or complete breakdown of information system.
Another fundamental need of information security of selective access control also cannot
be realized through the use of cryptography. Administrative controls and procedures are
required to be exercised for the same.
Cryptography does not guard against the vulnerabilities and threats that emerge from
the poor design of systems, protocols, and procedures. These need to be fixed through
proper design and setting up of a defensive infrastructure.
Cryptography comes at cost. The cost is in terms of time and money −
Addition of cryptographic techniques in the information processing leads to delay.
The use of public key cryptography requires setting up and maintenance of public key
infrastructure requiring the handsome financial budget.
The security of cryptographic technique is based on the computational difficulty of
mathematical problems. Any breakthrough in solving such mathematical problems or
increasing the computing power can render a cryptographic technique vulnerable.
Future of Cryptography
Elliptic Curve Cryptography ECC has already been invented but its advantages and
disadvantages are not yet fully understood. ECC allows to perform encryption and decryption in a
drastically lesser time, thus allowing a higher amount of data to be passed with equal security.
However, as other methods of encryption, ECC must also be tested and proven secure before it is
accepted for governmental, commercial, and private use.
Quantum computation is the new phenomenon. While modern computers store data using a
binary format called a "bit" in which a "1" or a "0" can be stored; a quantum computer stores data
using a quantum superposition of multiple states. These multiple valued states are stored in
"quantum bits" or "qubits". This allows the computation of numbers to be several orders of
magnitude faster than traditional transistor processors.
To comprehend the power of quantum computer, consider RSA-640, a number with 193 digits,
which can be factored by eighty 2.2GHz computers over the span of 5 months, one quantum
computer would factor in less than 17 seconds. Numbers that would typically take billions of years
to compute could only take a matter of hours or even minutes with a fully developed quantum
computer.
In view of these facts, modern cryptography will have to look for computationally harder problems
or devise completely new techniques of archiving the goals presently served by modern
cryptography.
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CRYPTOGRAPHY BENEFITS & DRAWBACKS

http://www.tutorialspoint.com/cryptography/benefits_and_drawbacks.htm Copyright © tutorialspoint.com

Confidentiality − Encryption technique can guard the information and communication

Non-repudiation − The digital signature provides the non-repudiation service to guard

High availability, one of the fundamental aspects of information security, cannot be

Cryptography comes at cost. The cost is in terms of time and money −

Addition of cryptographic techniques in the information processing leads to delay.

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