CYBR 7400 Midterm Exam
Questions with Answers
Security attacks are classified as either passive or aggressive - Answer-False - passive
or active
Authentication protocols and encryption algorithms are examples of security
mechanisms - Answer-True
Symmetric encryption is used to conceal the c...
CYBR 7400 Midterm Exam Questions with Answers Security attacks are classified as either passive or aggressive - Answer -False - passive or active Authentication protocols and encryption algorithms are examples of security mechanisms - Answer -True Symmetric encryption is used to conceal the contents of blocks or streams of data of any size, including messages, files, encryption keys, and passwords - Answer -True The data integrity service inserts bits into gaps in a data stream to frustrate traffic analysis attempts - Answer -False - traffic padding Data origin authentication does not provide protection against the modification of data units - Answer -True ____ 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 - Answer -
asymmetric encryption A common technique for masking contents of messages or other information traffic so that opponents cannot extract the information from the message is ____ - Answer -
encryption A loss of ____ is the unauthorized disclosure of information - Answer -confidentiality Verifying that users are who they say they are and that each input arriving at the system came from a trusted source is ____ - Answer -authenticity A ____ is a potential for violation of security, which exists when there is a circumstance, capability, action, or event that could breach security and cause harm - Answer -threat A ____ attack attempts to alter system resources or affect their operation - Answer -
active A loss of ____ is the unauthorized modification of information - Answer -integrity An attack tree is a branching, hierarchical data structure that represents a set of potential techniques for exploiting security vulnerabilities - Answer -true In the context of network security, access control is the ability to limit and control the access to host systems and applications via communication links - Answer -true Encryption prevents either sender or receiver from denying a transmitted message. Thus, when a message is sent, the receiver can prove that the alleged sender in fact sent the message and when a message is received, the sender can prove that the alleged re ceiver in fact received the message - Answer -false - nonrepudiation Symmetric encryption is a form of cryptosystem in which encryption and decryption are performed using different keys. It is also known as non -conventional encryption - Answer -false - asymmetric With the use of symmetric encryption, the principal security problem is maintaining the secrecy of the key - Answer -true The algorithm will produce a different output depending on the specific secret key being used at the time. The exact substitutions and transformations performed by the algorithm depend on the key - Answer -true A scheme known as a one -time pad is unbreakable because it produces random output that bears no statistical relationship to the plaintext - Answer -true ____ techniques map plaintext elements (characters, bits) into ciphertext elements - Answer -substitution ____ attacks exploit the characteristics of the algorithm to attempt to deduce a specific plaintext or to deduce the key being used - Answer -cryptanalytic The ____ attack is the easiest to defend against because the opponent has the least amount of information to work with - Answer -ciphertext only A technique referred to as a ____ is a mapping achieved by performing some sort of permutation on the plaintext letters - Answer -transposition cipher Cryptographic systems are characterized along three independent dimensions: the type of operations used for transforming plaintext to ciphertext, the way in which the plaintext is processed, and the number of keys used. - Answer -true DES uses a 56 -bit block and a 64 -bit key - Answer -false - 64-bit block and 56 -bit key A problem with the ideal block cipher using a small block size is that it is vulnerable to a statistical analysis of the plaintext - Answer -true
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