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) What do you meant by the term "Bastion Host"? What is its use? (b) "Hostile" Java applets will do undesirable actions. Mention two problems caused by Hosti

In this section, you should create a program that emulates a GBN node. Two GBN nodes will be running to send packets to each other through the UDP protocol. For emulation purpose,

project on ensuring data securities on cloud computing

a) Calculate the CRC for the frame below: Frame: 1101011011 Generator: 10011 Message after appending 4 zero bits: 11010110110000 b) OSI refers to a system in which any

QUESTION (a) Compare and contrast phishing and pharming attacks (b) Nowadays, web defacement may not always be visual (i) Explain web defacement (ii) What is the main

What is information security Information security protects information (and facilities and systems which store, use and transmit it) from a broad range of threats, in order to p

Types of IDSs and Detection Methods IDSs operate as network based, host based, or application based systems and focused on protecting network information assets. All the IDSs us

Digital Certificates Digital Certificates are electronic document having key value and identifying information about entity which controls key. Digital signature which is attach

Public Key Infrastructure (PKI) It is integrated system of software, encryption methodologies, protocols, legal agreements, and 3rd-party services enabling users to communicate

USING ICMP TO TEST REACHABILITY:  ICMP can also be used to test several tools. An Internet host A, is reachable from another host B, if data packets can be send from A to B. P