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Download Certified Encryption Specialist Exam Dumps
NEW QUESTION 41
If Bob is using asymmetric cryptography and wants to send a message to Alice so that only she can decrypt it, what key should he use to encrypt the message?
Answer: D
Explanation:
Alice's public key
https://en.wikipedia.org/wiki/Diffie%E2%80%93Hellman_key_exchange
In asymmetric (public key) cryptography, both communicating parties (i.e. both Alice and Bob) have two keys of their own - just to be clear, that's four keys total. Each party has their own public key, which they share with the world, and their own private key which they ... well, which they keep private, of course but, more than that, which they keep as a closely guarded secret. The magic of public key cryptography is that a message encrypted with the public key can only be decrypted with the private key. Alice will encrypt her message with Bob's public key, and even though Eve knows she used Bob's public key, and even though Eve knows Bob's public key herself, she is unable to decrypt the message. Only Bob, using his secret key, can decrypt the message ... assuming he's kept it secret, of course.
NEW QUESTION 42
DES has a key space of what?
Answer: C
Explanation:
2^56
https://en.wikipedia.org/wiki/Data_Encryption_Standard
The Data Encryption Standard (DES) is a symmetric-key algorithm for the encryption of digital data. Although its short key length of 56 bits makes it too insecure for applications, it has been highly influential in the advancement of cryptography.
NEW QUESTION 43
The time and effort required to break a security measure.
Answer: A
Explanation:
Work factor
Work factor - the time and effort required to break a security measure.
Incorrect answers:
Non-repudiation - involves associating actions or changes with a unique individual.
Session Key - is a single-use symmetric key used for encrypting all messages in one communication session. A closely related term is content encryption key (CEK), traffic encryption key (TEK), or multicast key which refers to any key used for encrypting messages, contrary to other uses like encrypting other keys (key encryption key (KEK) or key wrapping key).
Payload - is the part of transmitted data that is the actual intended message. Headers and metadata are sent only to enable payload delivery.
NEW QUESTION 44
How did the ATBASH cipher work?
Answer: D
Explanation:
By substituting each letter for the letter from the opposite end of the alphabet (i.e. A becomes Z, B becomes Y, etc.)
https://en.wikipedia.org/wiki/Atbash
The Atbash cipher is a particular type of monoalphabetic cipher formed by taking the alphabet (or abjad, syllabary, etc.) and mapping it to its reverse, so that the first letter becomes the last letter, the second letter becomes the second to last letter, and so on.
NEW QUESTION 45
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