Hashing, Digital Signatures and BlockChain Practice Questions

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A cybersecurity analyst needs to verify that a file has not been altered during transmission. Which cryptographic method should they use? Options: Symmetric encryption, Hashing, Digital certificates, Transport encryption

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Hashing

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Which of the following best describes the characteristics of a cryptographic hash? It is reversible using a private key., It provides confidentiality by encrypting data., It creates a unique, fixed-length value for input data., It replaces sensitive information with tokens.

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It creates a unique, fixed-length value for input data.

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An organization is implementing digital signatures for secure email communication. Which of the following goals does this technology primarily address? Confidentiality, Authentication and integrity, Obfuscation, Availability

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Authentication and integrity

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A system administrator notices that two different files produce the same hash value. What type of vulnerability does this scenario illustrate?

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Hash collision

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Which of the following best describes how adding a salt to a password before hashing improves security? Options: It makes the password hashing process faster. It prevents the reuse of the same password across multiple accounts. It ensures that identical passwords generate different hash values. It allows the password to be decrypted more securely.

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It ensures that identical passwords generate different hash values.

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A cybersecurity engineer is concerned about the possibility of MD5 hash collisions being exploited. What is the primary risk associated with hash collisions?

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Different inputs can appear identical, undermining data integrity.

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Which of the following is a key feature of blockchain technology that ensures its resistance to tampering? Private key encryption, Use of digital certificates, Hashing each block and linking it to the previous block, Storing data on centralized servers

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Hashing each block and linking it to the previous block

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A financial institution uses blockchain to record transactions. If an attacker attempts to modify the data in one block, what will happen to the blockchain?

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The hashes of all subsequent blocks will change, breaking the chain.

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Which of the following cryptographic techniques is used in blockchain to secure the data in each block? Asymmetric encryption, Hashing, Digital signatures, Tokenization

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Hashing

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A system administrator is tasked with protecting a password file from offline attacks. Which technique would make the hashed passwords more resistant to attacks? Options: Encrypting the file with symmetric encryption, Adding a unique salt to each password before hashing, Using a faster hashing algorithm like MD5, Applying steganography to the password file

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Adding a unique salt to each password before hashing