Question #1 (1 point) Character frequency analysis is an example of a ciphertext
ID: 3587091 • Letter: Q
Question
Question #1 (1 point) Character frequency analysis is an example of a ciphertext-only attack. True False Question #2 (1 point) Which item is the responsibility of key management? Access control, user authentication and authorization Key generation and destruction Access controls and encryption Key length and algorithm propriety Question #3 (3 points) Which of the following are primarily used to protect against replay attacks? Encryption Tokens Time Stamps Passwords Nonces Question #4 (1 point) What type of cryptanalytic attack where an adversary has the least amount ofinformation to work with? Chosen-ciphertext Known-plaintext Plaintext-only Ciphertext-only Question #5 (1 point) A type cryptographic attack where it is based on the probability of two different
messages using the same hash function to produce the same message digest is? Differential cryptanalysis attack Statistical Analysis attack Known ciphertext attack Birthday attack Question #6 (1 point) Certificate Authorities perform the following action: Provide protection against malicious code Ensuring that certificates are revoked when necessary by publishing certificate revocation lists Enforce strong password protection Provide authentication services and filters results returned to the user Question #7 (1 point) Encryption can help protect the integrity of data. True False Question #8 (1 point) Which of the following feature does a digital signature provide? It provides a framework for law and procedures. It ensures an individual’s privacy. It provides the ability to encrypt an individual’s confidential data. It identifies the source and verifies the integrity of data. Question #9 (1 point) What encryption operation is used when AES uses S-boxes during the process of
encryption? Key generation Key exchange Substitution Chaining Question #10 (3 points) Which of the following uses "substitution" techniques? 3DES Caesar cipher Poly-Alphabatic Data Encryption Standard (DES) Rivest, Shamir, Adleman (RSA) Question #11 (1 point) A cryptanalysts goal is to All of the Answers Break the encryption algorithm Break the message Recover the key Question #12 (1 point) The three security objectives are Confidentiality, integrity, and availability Confidentiality, privacy, and availability Integrity, tamperproof, and non-repudiation Availability, authentication, and confidentiality All Question #13 (1 point) Which answer is not true for Diffie-Hellman algorithm? It is used for distribution of a shared key, not for message encryption and decryption. It is vulnerable to man-in-the-middle attacks. Security stems from the difficulty of calculating the product of two large prime numbers. Question #14 (1 point) How many bits make up the effective Data Encryption Standard (DES) key? 56 32 64 16 Question #15 (1 point) The key distribution problem in secret key encryption is the need to Provide distributed control Develop available technology to distribute the keys Provide authentication method for each user Generate a key-pair for each user Question #16 (1 point) How may digits (approximately) is a 256 bit string. 50 75 100 125 Question #17 (1 point) The concept of least privilege…? guarantees that only security personnel can view and change audit logs. helps security personnel catch repetitive mistakes. assures that employees take mandatory vacations. assures that individuals only have the permissions and rights necessary for them to do their job. Question #18 (1 point) Which statement best describes the advantages of public key encryption? Knowledge of one’s public key does not yield knowledge of their private key None of the Above Keys are exchanged publicly without an eavesdropper being able to decrypt messages Encryption performance is faster than secret-key encryption Question #19 (1 point) Digital signatures provide following Security feature: Secrecy True False Question #20 (1 point) Alice and Bob both have Public-Private key pairs. Which key is used by Alice to sign her messages to Bob? Alice's Private Key Alice's Public Key Bob’s Private Key Bob's Public Key Question #21 (1 point) Integrity ... Protects against the disclosure of information to unauthorized users. Assures that a person or system is who or what they claim to be Protects against a person denying later that a communication or transaction took place Protects against unauthorized changes in data whether intentional or accidental. Question #22 (1 point) The MD5 algorithms perform what function? Key distribution Encryption Hashing Digital signature Question #23 (1 point) Non repudiation is Assures that a person or system is who or what they claim to be Protects against the disclosure of information to unauthorized users. Protects against unauthorized changes in data whether intentional or accidental. Protects against a person denying later that a communication or transaction took place Question #24 (1 point) What is the trusted registry that guarantees the authenticity of client and server public
keys? Key distribution center. Certification authority. Key revocation certificate. Public key notary. Question #25 (1 point) Which statement best captures the advantage of secret key encryption?
It allows for faster encryption speeds than public key encryption It only requires one key to be distributed for encryption and decryption The keys are stronger than public keys and are more difficult to break All of the Above Question #26 (1 point) What is the key size of AES 128 192 256 64 Question #27 (1 point) Symmetric encryption is used for authentication mostly, while asymmetric is used mostly for confidentiality. True False Question #28 (1 point) Alice and Bob both have Public-Private key pairs. Which key is used to verify digitally signed message sent by Alice to Bob? Bob's Public Key Alice's Private Key Bob’s Private Key Alice's Public Key Question #29 (1 point) Security can be no stronger than its Weakest link Cryptographic support Policy specification Documented level Overlapping controls Question #30 (1 point) Symmetric ciphers are typically less computationally expensive than public-key cryptographic schemes. True False Question #31 (1 point) Digital signatures require the property of nonrepudiation, which says that a principal should not be able to spoof another principal’s signature. True False Question #32 (1 point) Cryptography does not concern itself with: Integrity Confidentiality Availability Authenticity Question #33 (1 point) A way of verifying a message’s integrity after transport across a network is through the use of: An encryption key Steganography A Cipher A Message Authentication Code Question #34 (1 point) The DES cryptosystem has been shown to be uncrackable except by brute force attacks. True False Question #35 (1 point) Alice and Bob both have Public-Private key pairs. Which key is used by Bob to encrypt his messages to Alice for secrecy? Bob's Public Key Alice's Private Key Bob’s Private Key Alice's Public Key Question #36 (1 point) In computer security, …………………….. means that the information in a computer system only be accessible for reading by authorized parities. Confidentiality Authenticity Integrity Availability Question #37 (1 point) A good password for human authentication should contain atleast 64 bits of random information, as provided by a typical mixed-case, alphanumeric, 8-character ASCII string True False Question #38 (1 point) Authentication ... Protects against unauthorized changes in data whether intentional or accidental. Assures that a person or system is who or what they claim to be Protects against a person denying later that a communication or transaction took place Protects against the disclosure of information to unauthorized users. Question #39 (1 point) The method of providing capability to detect any change to a file is called Non-repudiation Integrity Key distribution Digital signature Question #40 (1 point) For cryptosytems, it is acceptable if some keys are more secure than others. True False Question #41 (1 point) A cipher that scrambles letters into different positions is referred to as what? Substitution Transposition Stream Confusion Question #42 (1 point) Confidentiality is Assures that a person or system is who or what they claim to be Protects against the disclosure of information to unauthorized users. Protects against a person denying later that a communication or transaction took place Protects against unauthorized changes in data whether intentional or accidental. Question #43 (1 point) Leaving unused services enabled is fine from a security perspective as they are not used True False Question #44 (1 point) Which of the following mechanism is used to achieve non-repudiation of a message
delivery? Sender sends the message to a TTP who signs it together with a time stamp and sends it on to the recipient. Sender gets a digitally signed acknowledgment from the recipient containing a copy or digest of the message. Sender computes a digest of the message and sends it to a Trusted Third Party (TTP) who signs it and stores it for later reference. Sender encrypts the message with the recipients public key and signs it with their own private key. Question #45 (1 point) MD5 is a two way function. True False Question #46 (1 point) Improperly applied cryptography is the #1 source of security violations in the Internet today. True False Question #47 (1 point) Secrecy ... Protects against the disclosure of information to unauthorized users. Protects against unauthorized changes in data whether intentional or accidental. Assures that a person or system is who or what they claim to be Protects against a person denying later that a communication or transaction took place Question #48 (1 point) What is the block size of DES in bits. (Only enter the number.) Answer: Question #49 (1 point) In computer security, ……………………. means that computer system assets can be modified only by authorized parities. Confidentiality Availability Integrity Authenticity Question #50 (1 point) 3DES is designed to be backwards compatible with DES. True False
Question #1 (1 point) Character frequency analysis is an example of a ciphertext-only attack. True False
Explanation / Answer
CHEGG POLICY: ONLY ONE QUESTION PER POST IS ALLOWED or A SINGLE QUESTION WITH ATMOST 4 SUB - PARTS . please ABIDE BY THE CHEGG POLICY
post further questions accordingly
Solution:
1) True
2) Key length and algorithm propriety
3) Tokens
4) Chosen-ciphertext
PLEASE RATE !!
Thanks !