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NEW QUESTION: 1
What uses a key of the same length as the message where each bit or character from the plaintext is encrypted by a modular addition?
A. Running key cipher
B. Steganography
C. Cipher block chaining
D. One-time pad
Answer: D
Explanation:
Explanation/Reference:
Explanation:
In cryptography, the one-time pad (OTP) is an encryption technique that cannot be cracked if used correctly. In this technique, a plaintext is paired with a random secret key (also referred to as a one-time pad). Then, each bit or character of the plaintext is encrypted by combining it with the corresponding bit or character from the pad using modular addition. If the key is truly random, is at least as long as the plaintext, is never reused in whole or in part, and is kept completely secret, then the resulting ciphertext will be impossible to decrypt or break. However, practical problems have prevented one-time pads from being widely used.
The "pad" part of the name comes from early implementations where the key material was distributed as a pad of paper, so that the top sheet could be easily torn off and destroyed after use.
The one-time pad has serious drawbacks in practice because it requires:
Truly random (as opposed to pseudorandom) one-time pad values, which is a non-trivial requirement.
Secure generation and exchange of the one-time pad values, which must be at least as long as the
message. (The security of the one-time pad is only as secure as the security of the one-time pad exchange).
Careful treatment to make sure that it continues to remain secret, and is disposed of correctly
preventing any reuse in whole or part-hence "one time".
Because the pad, like all shared secrets, must be passed and kept secure, and the pad has to be at least as long as the message, there is often no point in using one-time padding, as one can simply send the plain text instead of the pad (as both can be the same size and have to be sent securely).
Distributing very long one-time pad keys is inconvenient and usually poses a significant security risk. The pad is essentially the encryption key, but unlike keys for modern ciphers, it must be extremely long and is much too difficult for humans to remember. Storage media such as thumb drives, DVD-Rs or personal digital audio players can be used to carry a very large one-time-pad from place to place in a non- suspicious way, but even so the need to transport the pad physically is a burden compared to the key negotiation protocols of a modern public-key cryptosystem, and such media cannot reliably be erased securely by any means short of physical destruction (e.g., incineration).
The key material must be securely disposed of after use, to ensure the key material is never reused and to protect the messages sent. Because the key material must be transported from one endpoint to another, and persist until the message is sent or received, it can be more vulnerable to forensic recovery than the transient plaintext it protects.
Incorrect Answers:
A: Running key cipher does not use a key of the same length as the message.
C: Steganography is a method of hiding data in another media type so the very existence of the data is concealed. This is not what is described in the question.
D: Cipher block chaining is an encryption method where each block of text, the key, and the value based on the previous block are processed in the algorithm and applied to the next block of text. This is not what is described in the question.
References:
https://en.wikipedia.org/wiki/One-time_pad
NEW QUESTION: 2
次の顧客がいます。顧客A.顧客。
顧客は次の問題を報告します。
問題を解決する必要があります。
あなたは何をするべきか？答えるには、適切なアクションを正しい顧客にドラッグします。各アクションは、1回、複数回、またはまったく使用できません。コンテンツを表示するには、スクロールするペイン間で分割バーをドラッグする必要がある場合があります。
注：それぞれの正しい選択には1ポイントの価値があります。
Answer:
Explanation:
Explanation:
参照：
https://docs.microsoft.com/en-us/dynamics365/customer-engagement/admin/connect-exchange-server-on-mise
NEW QUESTION: 3
Siehe Ausstellung.
Ein Techniker hat die Aufgabe, die Netzwerkkonfigurationsparameter auf einer Client-Workstation zu überprüfen, um dem Teamleiter Bericht zu erstatten. Ziehen Sie die Knotenkennungen von links auf die Netzwerkparameter rechts.
Answer:
Explanation:
NEW QUESTION: 4
Which of the following description is wrong about the operating system?
A. The operating system is responsible for managing the execution of all hardware resources and control software of the computer system.
B. The interface between the operating system and the user is a graphical interface.
C. The operating system itself is also a software
D. The operating system is the interface between the user and the computer
Answer: B
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