Introduction to Cryptography (D334)
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Free Introduction to Cryptography (D334) Questions
Which component is used to verify the integrity of a message?
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TKIP
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IV
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HMAC
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AES
Explanation
Explanation
HMAC (Hash-based Message Authentication Code) is specifically designed to verify message integrity and authenticity. It combines a cryptographic hash function with a secret key to produce a message authentication code. When the recipient recalculates the HMAC and compares it to the received value, any alteration of the message is detected, ensuring the data has not been modified in transit.Correct Answer Is:
HMACHow does a cryptographic policy assist in incident response?
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It focuses solely on post-incident analysis.
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It eliminates the need for an incident response team.
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It provides specific instructions for responding to breaches.
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It restricts flexibility in responding to incidents.
Explanation
Correct answer
C. It provides specific instructions for responding to breaches.
Explanation
A cryptographic policy supports incident response by defining how cryptographic controls such as encryption, key management, and data protection should be handled during security events. This includes clear procedures for responding to breaches involving encrypted data, such as key revocation, encryption reconfiguration, and secure communication protocols. By providing structured guidance, it helps incident responders act consistently and effectively during security incidents rather than relying on ad hoc decisions.
Why is it important for it to be computationally infeasible for an adversary to determine the private key from the public key
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To make encryption faster
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To ensure the privacy of the public key
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To protect the confidentiality of the private key
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To increase the size of the key pair
Explanation
Correct Answer C. To protect the confidentiality of the private key
Explanation
In asymmetric encryption, the public key is shared openly while the private key must remain confidential. If it were computationally feasible for an adversary to derive the private key from the public key, the entire system would be compromised. This would allow an attacker to decrypt messages, sign documents, or impersonate the key owner. Ensuring that deriving the private key is computationally infeasible protects the confidentiality of the private key and secures the communication system.
Why other options are wrong
A. To make encryption faster
The speed of encryption is generally not a concern related to the computational difficulty of determining a private key from the public key. Encryption algorithms may be optimized for speed separately from their security. The focus here is on ensuring the security of the private key, not encryption speed.
B. To ensure the privacy of the public key
The public key is meant to be publicly available, so its privacy is not a concern. The issue lies with ensuring that the private key remains secret. Making the private key computationally difficult to derive from the public key helps to maintain the integrity and security of the system.
D. To increase the size of the key pair
While increasing the size of the key pair can enhance security, it is not the reason why it is important for an adversary to be unable to determine the private key from the public key. The core concern is ensuring the confidentiality of the private key, which cannot be easily derived from the public key, regardless of key size.
What is the significance of Claude Shannon's work in the field of cryptography
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He developed the first symmetric key algorithm.
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He introduced the concept of public key infrastructure.
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He established the principles of information theory that underlie modern cryptographic techniques.
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He created the first digital signature algorithm
Explanation
Correct Answer C. He established the principles of information theory that underlie modern cryptographic techniques.
Explanation
Claude Shannon's work is foundational in the field of cryptography. He is known as the father of modern cryptography, and his groundbreaking work on information theory provided the theoretical underpinnings for secure communications and cryptographic techniques. Shannon's development of concepts such as entropy, confusion, and diffusion directly influenced the design of secure cryptographic systems and continues to shape the field today.
Why other options are wrong
A. He developed the first symmetric key algorithm.
Shannon did not develop the first symmetric key algorithm. While he made significant contributions to cryptography, symmetric key algorithms were already in use before Shannon's work. His contributions focused more on theoretical principles rather than the creation of specific algorithms.
B. He introduced the concept of public key infrastructure.
Claude Shannon's work predates the development of public key cryptography and public key infrastructure (PKI). The concept of public key cryptography was introduced later by Whitfield Diffie and Martin Hellman in the 1970s, well after Shannon's time.
D. He created the first digital signature algorithm.
Shannon did not create the first digital signature algorithm. Digital signatures became a focus of cryptography in the 1970s with the work of researchers like Ronald Rivest, who developed the RSA algorithm. Shannon's contributions, however, were foundational to understanding encryption systems.
How many rounds of encryption does ChaCha use to encrypt data?
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10
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20
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30
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40
Explanation
Explanation
ChaCha is a stream cipher designed as a more secure and efficient alternative to RC4. The standard and most widely used variant, ChaCha20, uses 20 rounds of encryption. These rounds provide strong diffusion and resistance against cryptographic attacks while maintaining high performance on both software and hardware platforms.Correct Answer Is:
20How does OFB mode encryption function?
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Encrypts each block with the same key, where each block is independent of the others
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Uses an initialization vector (IV) to encrypt the first block, then uses the result of the encryption to encrypt the next block
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Converts from block to stream, then uses a counter value and a nonce to encrypt the data
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Uses an encrypted version of the initialization vector (IV) and XORs the data, then uses the result from the first block to encrypt the next block
Explanation
Explanation
OFB (Output Feedback) mode encryption generates a stream of pseudo-random bits using an encrypted initialization vector (IV), and XORs these bits with the plaintext data. This ensures the data is encrypted without directly chaining blocks together.Correct Answer Is:
D) Uses an encrypted version of the initialization vector (IV) and XORs the data, then uses the result from the first block to encrypt the next blockWhy did the National Institute of Standards and Technology (National Institute of Standards and Technology) select Ascon for lightweight cryptography?
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To establish a standard for lightweight encryption algorithms
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To compress data for efficient storage
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To generate random numbers for encryption
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To replace all current cryptographic algorithms
Explanation
Correct answer
A. To establish a standard for lightweight encryption algorithms
Explanation
NIST selected Ascon as part of its lightweight cryptography standardization process to provide a standardized, efficient cryptographic algorithm specifically designed for resource-constrained environments such as IoT devices, embedded systems, and low-power hardware. The goal was not to replace existing cryptographic systems, but to establish a vetted, standardized solution for lightweight encryption where traditional algorithms may be too resource-intensive. It is not related to data compression or random number generation.
What is homomorphic encryption?
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A method of generating random numbers for encryption purposes
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A process of decrypting data without the need for a key
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A method of securely transmitting data over a network
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A technique that allows for computations to be performed on encrypted data without decrypting it
Explanation
Correct answer
D. A technique that allows for computations to be performed on encrypted data without decrypting it
Explanation
Homomorphic encryption is a cryptographic method that allows computations to be carried out directly on encrypted data without needing to decrypt it first. The result of those computations remains encrypted, and when decrypted, it matches the result of operations performed on the plaintext. This makes it especially useful in privacy-preserving cloud computing and secure data processing. The other options describe unrelated concepts such as keyless decryption, data transmission, or random number generation.
Which authentication method allows a customer's computer to authenticate with the machine hosting services on a network?
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One-way server authentication
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One-way client authentication
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Intermediate authentication
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Mutual authentication
Explanation
Explanation
One-way client authentication is used when the client proves its identity to the server hosting the services. In this model, the server verifies the credentials or certificate presented by the customer’s computer, but the server does not authenticate itself back to the client. This is common in scenarios such as user logins to network services, databases, or internal applications where only the client must be validated.Correct Answer Is:
One-way client authenticationWhich is an example of asymmetric encryption?
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Hash-based message authentication code (HMAC)
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Elliptic-curve cryptography (ECC)
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Data Encryption Standard (DES)
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Secure Hash Algorithm 256 (SHA-256)
Explanation
Correct answer
B. Elliptic-curve cryptography (ECC)
Explanation
Asymmetric encryption uses a pair of mathematically related keys—a public key for encryption and a private key for decryption. Elliptic-curve cryptography is a well-known example of asymmetric encryption because it relies on public-private key pairs to secure communication efficiently, especially in modern secure systems like TLS. In contrast, HMAC is used for message authentication, DES is a symmetric encryption algorithm, and SHA-256 is a cryptographic hash function rather than an encryption method.
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You’ll dive into core cryptographic principles including symmetric and asymmetric encryption (e.g., AES, RSA), hashing (SHA, MD5), digital signatures, key management, and secure protocols like SSL/TLS.
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