Cryptography and Network Security Principles Top Predicted Questions and Correct Answers

Cryptography and Network Security Principles Top Predicted Questions and Correct Answers Asymmetric encryption - ✔✔1. Is the most common method used to conceal small blocks of data, such as encryption keys and hash function values, which are used in digital signatures encryptio n - ✔✔2. A common technique for masking contents of messages or other information traffic so that opponents cannot extract the information from the message is. Replay - ✔✔3. Involves the passive capture of a data unit and its subsequent retransmission to produce an unauthorized effect. Layering - ✔✔4. Refers to the use of multiple, overlapping protection approaches addressing the people, technology, and operational aspects of information systems. Confidentiality - ✔✔5. A loss of __________ is the unautho rized disclosure of information Authenticity - ✔✔6. Verifying that users are who they say they are and that each input arriving at the system came from a trusted source is Moderate - ✔✔7. A _________ level breach of security could cause a significant deg radation in mission capability to an extent and duration that the organization is able to perform its primary functions, but the effectiveness of the functions is significantly reduced. Security Attack - ✔✔8. A __________ is any action that compromises th e security of information owned by an organization masquerade - ✔✔9. A __________ takes place when one entity pretends to be a different entity. Availability - ✔✔A(n) __________ service is one that protects a system to ensure its availability and address es the security concerns raised by denial - of- service attacks. Substitution - ✔✔1. Techniques map plaintext elements (characters, bits) into ciphertext elements. One Time Pad - ✔✔2. Joseph Mauborgne proposed an improvement to the Vernam cipher that uses a random key that is as long as the message so that the key does not need to be repeated. The key is used to encrypt and decrypt a single message and then is discarded. Each new message requires a new key of the same length as the new message. This scheme is known as a(n) plaintext, ciphertext - ✔✔3. An original intelligible message fed into the algorithm as input is known as _________ , while the coded message produced as output is called the Deciphering - ✔✔4. Restoring the plaintext from the ciphertex t is Brute force - ✔✔5. A __________ attack involves trying every possible key until an intelligible translation of the ciphertext is obtained Cryptanalyses - ✔✔6. Techniques used for deciphering a message without any knowledge of the enciphering details is. Decryption Algorithm - ✔✔7. The ___________ takes the ciphertext and the secret key and produces the original plaintext. It is essentially the encryption algorithm run in reverse conventional encryption - ✔✔8. If both sender and receiver use the same key, the system is referred to as Cryptanalytic - ✔✔9. attacks exploit the characteristics of the algorithm to attempt to deduce a specific pl aintext or to deduce the key being used