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NEW QUESTION: 1
Which of the following cryptographic attacks describes when the attacker has a copy of the plaintext and the corresponding ciphertext?
A. ciphertext only
B. chosen plaintext
C. brute force
D. known plaintext
Answer: D
Explanation:
The goal to this type of attack is to find the cryptographic key that was used to encrypt the message. Once the key has been found, the attacker would then be able to decrypt all messages that had been encrypted using that key.
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. The term "crib" originated at Bletchley Park, the British World War II decryption operation
In cryptography, a brute force attack or exhaustive key search is a strategy that can in theory be used against any encrypted data by an attacker who is unable to take advantage of any weakness in an encryption system that would otherwise make his task easier. It involves systematically checking all possible keys until the correct key is found. In the worst case, this would involve traversing the entire key space, also called search space.
In cryptography, a ciphertext-only attack (COA) or known ciphertext attack is an attack model for cryptanalysis where the attacker is assumed to have access only to a set of ciphertexts.
The attack is completely successful if the corresponding plaintexts can be deduced, or even better, the key. The ability to obtain any information at all about the underlying plaintext is still considered a success. For example, if an adversary is sending ciphertext continuously to maintain traffic-flow security, it would be very useful to be able to distinguish real messages from nulls. Even making an informed guess of the existence of real messages would facilitate traffic analysis.
In the history of cryptography, early ciphers, implemented using pen-and-paper, were routinely broken using ciphertexts alone. Cryptographers developed statistical techniques for attacking ciphertext, such as frequency analysis. Mechanical encryption devices such as Enigma made these attacks much more difficult (although, historically, Polish cryptographers were able to mount a successful ciphertext-only cryptanalysis of the Enigma by exploiting an insecure protocol for indicating the message settings).
Every modern cipher attempts to provide protection against ciphertext-only attacks. The vetting process for a new cipher design standard usually takes many years and includes exhaustive testing of large quantities of ciphertext for any statistical departure from random noise. See: Advanced Encryption Standard process. Also, the field of steganography evolved, in part, to develop methods like mimic functions that allow one piece of data to adopt the statistical profile of another. Nonetheless poor cipher usage or reliance on home-grown proprietary algorithms that have not been subject to thorough scrutiny has resulted in many computer-age encryption systems that are still subject to ciphertext-only attack. Examples include:
Early versions of Microsoft's PPTP virtual private network software used the same RC4 key for the
sender and the receiver (later versions had other problems). In any case where a stream cipher
like RC4 is used twice with the same key it is open to ciphertext-only attack. See: stream cipher
attack
Wired Equivalent Privacy (WEP), the first security protocol for Wi-Fi, proved vulnerable to several
attacks, most of them ciphertext-only.
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, where the cryptanalyst makes a series of interactive queries,
choosing subsequent plaintexts based on the information from the previous encryptions.
References:
Source: TIPTON, Harold, Official (ISC)2 Guide to the CISSP CBK (2007), page 271.
and
Wikipedia at the following links:
http://en.wikipedia.org/wiki/Chosen-plaintext_attack
http://en.wikipedia.org/wiki/Known-plaintext_attack
http://en.wikipedia.org/wiki/Ciphertext-only_attac
http://en.wikipedia.org/wiki/Brute_force_attack
NEW QUESTION: 2
You have an Exchange organization. All servers in the organization have Exchange Server 2010 SP1 installed.
You need to identify why a remote SMTP server rejects email sent from the organization.
What should you do?
A. Modify the message tracking settings on the Transport server, and then review the message tracking logs.
B. Modify the protocol logging level on the Send connectors, and then review the protocol logs.
C. Modify the diagnostic logging level on the MSEchangeTransportService object, and then review the Application event log.
D. Modify the connectivity log settings on the Transport server, and then review the connectivity logs.
Answer: B
Explanation:
Protocol logging records the SMTP conversations that occur between email servers as part of message delivery. These SMTP conversations occur on Send connectors and Receive connectors configured on servers running Microsoft Exchange Server 2010 that have the Hub Transport server role or the Edge Transport server role installed. You can use protocol logging to diagnose mail flow problems.
Reference:
http://technet.microsoft.com/en-us/library/bb124531.aspx
NEW QUESTION: 3
GetDealPriceメソッドはAjaxを使用して呼び出す必要があります。ProductControllerのGetDealPriceメソッドを使用して製品の価格を取得する必要があります。どのコードセグメントを使うべきでしょうか。 (正解はそれぞれ完全解を示します。当てはまるものをすべて選んでください。)
A. Option C
B. Option D
C. Option B
D. Option A
Answer: A,B
NEW QUESTION: 4
Amazon Cognitoでは、サイレントプッシュ通知とは何ですか?
A. ユーザーのデバイスでアプリケーションが受信するプッシュメッセージであり、ユーザーの位置情報を返します。
B. ユーザーのデバイスでアプリケーションが受信するプッシュメッセージであり、ユーザーには聞こえません。
C. ユーザーのデバイスでアプリケーションが受信するプッシュメッセージであり、ユーザーの認証資格情報を返します。
D. これは、ユーザーのデバイスでアプリケーションが受信するプッシュメッセージであり、ユーザーには表示されません。
Answer: D
Explanation:
説明
Amazon Cognito uses the Amazon Simple Notification Service (SNS) to send silent push notifications to devices. A silent push notification is a push message that is received by your application on a user's device that will not be seen by the user.
http://aws.amazon.com/cognito/faqs/
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