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NEW QUESTION: 1
This type of attack is generally most applicable to public-key cryptosystems, what type of attack am I ?
A. Adaptive-Chosen-Plaintext attack
B. Chosen-Ciphertext attack
C. Ciphertext-only attack
D. Plaintext Only Attack
Answer: B
Explanation:
A chosen-ciphertext attack is one in which cryptanalyst may choose a piece of ciphertext and attempt to obtain the corresponding decrypted plaintext. This type of attack is generally most applicable to public-key cryptosystems.
A chosen-ciphertext attack (CCA) is an attack model for cryptanalysis in which the cryptanalyst gathers information, at least in part, by choosing a ciphertext and obtaining its decryption under an unknown key. In the attack, an adversary has a chance to enter one or more known ciphertexts into the system and obtain the resulting plaintexts. From these pieces of information the adversary can attempt to recover the hidden secret key used for decryption.
A number of otherwise secure schemes can be defeated under chosen-ciphertext attack. For example, the El Gamal cryptosystem is semantically secure under chosen-plaintext attack, but this semantic security can be trivially defeated under a chosen-ciphertext attack. Early versions of RSA padding used in the SSL protocol were vulnerable to a sophisticated adaptive chosen-ciphertext attack which revealed SSL session keys. Chosen-ciphertext attacks have implications for some self-synchronizing stream ciphers as well. Designers of tamper-resistant cryptographic smart cards must be particularly cognizant of these attacks, as these devices may be completely under the control of an adversary, who can issue a large number of chosen-ciphertexts in an attempt to recover the hidden secret key.
According to RSA: Cryptanalytic attacks are generally classified into six categories that distinguish the kind of information the cryptanalyst has available to mount an attack. The categories of attack are listed here roughly in increasing order of the quality of information available to the cryptanalyst, or, equivalently, in decreasing order of the level of difficulty to the cryptanalyst. The objective of the cryptanalyst in all cases is to be able to decrypt new pieces of ciphertext without additional information. The ideal for a cryptanalyst is to extract the secret key.
A ciphertext-only attack is one in which the cryptanalyst obtains a sample of ciphertext, without the plaintext associated with it. This data is relatively easy to obtain in many scenarios, but a successful ciphertext-only attack is generally difficult, and requires a very large ciphertext sample. Such attack was possible on cipher using Code Book Mode where frequency analysis was being used and even thou only the ciphertext was available, it was still possible to eventually collect enough data and decipher it without having the key.
A known-plaintext attack is one in which the cryptanalyst obtains a sample of ciphertext and the corresponding plaintext as well. The known-plaintext attack (KPA) or crib is an attack model for cryptanalysis where the attacker has samples of both the plaintext and its encrypted version (ciphertext), and is at liberty to make use of them to reveal further secret information such as secret keys and code books.
A chosen-plaintext attack is one in which the cryptanalyst is able to choose a quantity of plaintext and then obtain the corresponding encrypted ciphertext. A chosen-plaintext attack (CPA) is an attack model for cryptanalysis which presumes that the attacker has the capability to choose arbitrary plaintexts to be encrypted and obtain the corresponding ciphertexts. The goal of the attack is to gain some further information which reduces the security of the encryption scheme. In the worst case, a chosen-plaintext attack could reveal the scheme's secret key.
This appears, at first glance, to be an unrealistic model; it would certainly be unlikely that an attacker could persuade a human cryptographer to encrypt large amounts of plaintexts of the attacker's choosing. Modern cryptography, on the other hand, is implemented in software or hardware and is used for a diverse range of applications; for many cases, a chosen-plaintext attack is often very feasible. Chosen-plaintext attacks become extremely important in the context of public key cryptography, where the encryption key is public and attackers can encrypt any plaintext they choose.
Any cipher that can prevent chosen-plaintext attacks is then also guaranteed to be secure against known-plaintext and ciphertext-only attacks; this is a conservative approach to security.
Two forms of chosen-plaintext attack can be distinguished:
Batch chosen-plaintext attack, where the cryptanalyst chooses all plaintexts before any of them are encrypted. This is often the meaning of an unqualified use of "chosen-plaintext attack".
Adaptive chosen-plaintext attack, is a special case of chosen-plaintext attack in which the cryptanalyst is able to choose plaintext samples dynamically, and alter his or her choices based on the results of previous encryptions. The cryptanalyst makes a series of interactive queries, choosing subsequent plaintexts based on the information from the previous encryptions.
Non-randomized (deterministic) public key encryption algorithms are vulnerable to simple
"dictionary"-type attacks, where the attacker builds a table of likely messages and their
corresponding ciphertexts. To find the decryption of some observed ciphertext, the attacker
simply looks the ciphertext up in the table. As a result, public-key definitions of security
under chosen-plaintext attack require probabilistic encryption (i.e., randomized encryption).
Conventional symmetric ciphers, in which the same key is used to encrypt and decrypt a
text, may also be vulnerable to other forms of chosen-plaintext attack, for example,
differential cryptanalysis of block ciphers.
An adaptive-chosen-ciphertext is the adaptive version of the above attack. A cryptanalyst
can mount an attack of this type in a scenario in which he has free use of a piece of
decryption hardware, but is unable to extract the decryption key from it.
An adaptive chosen-ciphertext attack (abbreviated as CCA2) is an interactive form of
chosen-ciphertext attack in which an attacker sends a number of ciphertexts to be
decrypted, then uses the results of these decryptions to select subsequent ciphertexts. It is
to be distinguished from an indifferent chosen-ciphertext attack (CCA1).
The goal of this attack is to gradually reveal information about an encrypted message, or
about the decryption key itself. For public-key systems, adaptive-chosen-ciphertexts are
generally applicable only when they have the property of ciphertext malleability - that is, a
ciphertext can be modified in specific ways that will have a predictable effect on the
decryption of that message.
A Plaintext Only Attack is simply a bogus detractor. If you have the plaintext only then there
is no need to perform any attack.
References:
RSA Laboratories FAQs about today's cryptography: What are some of the basic types of
cryptanalytic attack?
also see:
http://www.giac.org/resources/whitepaper/cryptography/57.php
and
http://en.wikipedia.org/wiki/Chosen-plaintext_attack
NEW QUESTION: 2
Joe, an administrator, installs a web server on the Internet that performs credit card transactions for customer payments. Joe also sets up a second web server that looks like the first web server.
However, the second server contains fabricated files and folders made to look like payments were processed on this server but really were not. Which of the following is the second server?
A. DMZ
B. VLAN
C. Honeypot
D. Honeynet
Answer: C
Explanation:
In this scenario, the second web server is a 'fake' webserver designed to attract attacks.
We can then monitor the second server to view the attacks and then ensure that the 'real' web server is secure against such attacks. The second web server is a honeypot.
A honeypot is a system whose purpose it is to be attacked. An administrator can watch and study the attack to research current attack methodologies.
According to the Wepopedia.com, a Honeypot luring a hacker into a system has several main purposes:
The administrator can watch the hacker exploit the vulnerabilities of the system, thereby learning where the system has weaknesses that need to be redesigned.
The hacker can be caught and stopped while trying to obtain root access to the system.
By studying the activities of hackers, designers can better create more secure systems that are potentially invulnerable to future hackers.
There are two main types of honeypots:
Production - A production honeypot is one used within an organization's environment to help mitigate risk.
Research - A research honeypot add value to research in computer security by providing a platform to study the threat.
NEW QUESTION: 3
A zone file consists of which of the following Resource Records (RRs)?
A. DNS, NS, PTR, and MX records
B. SOA, NS, AXFR, and MX records
C. SOA, NS, A, and MX records
D. DNS, NS, AXFR, and MX records
Answer: C
Explanation:
The zone file typically contains the following records:
SOA - Start Of Authority NS - Name Server record MX - Mail eXchange record A - Address record
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