Attacks on cryptosystems-cryptography, Computer Network Security

Attacks on Cryptosystems
Attacks are attempts to achieve unauthorized access to secure communications have characteristically used brute force attacks. Attacker may alternatively conduct known plaintext attack or selected plaintexts attach schemes.
The different methods of attacks are as follows:

Man-in-the-Middle Attack
This technique is designed to intercept transmission of public key or insert known as key structure in place of requested public key. From victims’ perception, encrypted communication appears to be taking place normally, but actually attacker receives each encrypted message, decodes, encrypts, and sends it to originally intended recipient. Establishment of public keys with the digital signatures can prevent traditional man in the middle attack Correlation Attacks

Collection of brute force methods which attempt to deduce statistical relationships between structure of unknown key and ciphertext is called as correlation attacks. Differential and linear cryptanalysis has been used to mount successful attacks. Only defense organization is the selection of strong cryptosystems, by key management, and strict adherence to finest practices of cryptography in frequency of changing keys.

Dictionary Attacks
In the dictionary attack, attacker encrypts every word in a dictionary by using same cryptosystem used by target. Dictionary attacks can become successful if ciphertext consists of relatively few characters (for instance usernames, passwords).

Timing Attacks
Attacker eavesdrops through victim’s session is sometimes called timing attacks which uses statistical analysis of user’s typing patterns and inter keystroke timings to discern sensitive session information.

It is used to gain information about encryption key and possibly cryptosystem in use. Once encryption is broken successfully, attacker may launch a replay attack (an attempt to resubmit recording of deciphered authentication for entry into secure source).

Defending From Attacks
Does not matter how sophisticated encryption and cryptosystems have become, if key is revealed, message can be determined easily. Key management is not so much management of technology but instead management of people.

Posted Date: 10/9/2012 2:43:05 AM | Location : United States







Related Discussions:- Attacks on cryptosystems-cryptography, Assignment Help, Ask Question on Attacks on cryptosystems-cryptography, Get Answer, Expert's Help, Attacks on cryptosystems-cryptography Discussions

Write discussion on Attacks on cryptosystems-cryptography
Your posts are moderated
Related Questions
QUESTION: a) Explain four issues that are generally addressed in the Needs Analysis phase in the building-block approach to network design. b) Sketch a typical hybrid star-b

Q. Explain about Security aware protocols? The security-Aware ad hoc Routing (SAR) protocol based on the security attributes integrated into the ad hoc route discovery provides

how to encryt the data in plaintext cipher

PROCESSING AN INCOMING ARP MESSAGE When an ARP message reaches, the protocol specifies that the receiver must operate two basic steps. First the receiver finds the sender's add


DEPLOYMENT AND IMPLEMENTING OF AN IDS The strategy for deploying IDS should consider various factors. These factors will determine the number of administrators required to insta

Problem: (a) Use a simple example to explain what is meant by a finite state machine. (b) Describe the time limit problem in an interrupt-driven system. (c) A certain m

How safe is the encryption of virtual private networks?

Question 1:  Describe the functioning of cloud computing. Question 2: Discuss on "Platform as a Service". Question 3: Discuss the steps involved in effective co

Bridges perform both in the data link layers and physical of LANs of same kind. They split a bigger network in to smaller segments. They have logic that accept them to store the