Cryptographic Principles and Their Role in Blockchain BBLC Practice Questions (Page 6)

Questions 26–30

1. 26foundation · easy

   What is a primary advantage of Elliptic Curve Cryptography (ECC) over RSA in blockchain applications?

   • AECC uses larger key sizes for better security
   • BECC provides stronger encryption than RSA for the same key size
   • CECC is easier to implement than RSA
   • DECC provides equivalent security with smaller key sizes, leading to faster computations and lower storage requirements
   Reveal Solution Discussion Select an answer first
2. 27foundation · easy

   Which property of a cryptographic hash function ensures that even a single-bit change in the input produces a completely different output hash?

   • ACollision resistance
   • BDeterminism
   • CPreimage resistance
   • DAvalanche effect
   Reveal Solution Discussion Select an answer first
4. 28application · medium

   A blockchain platform is being designed for IoT devices with limited computational power and memory. The developers need to choose a public-key cryptographic algorithm for signing transactions. They want to minimize key size and computational overhead while maintaining strong security. Which algorithm is the most appropriate choice?

   • ASHA-256 hashing, because it is fast and produces a small digest.
   • BAES with a 128-bit key, because symmetric encryption is faster and uses less memory.
   • CElliptic Curve Cryptography (ECC) with a 256-bit key, because it offers equivalent security to RSA with much smaller keys and faster operations.
   • DRSA with a 2048-bit key, because it is widely supported and has a long track record.
   Reveal Solution Discussion Select an answer first
5. 29expert · hard

   A blockchain network uses a hash-based proof-of-work. An attacker with significant hash power is attempting to rewrite a block by finding a new nonce that produces a valid hash. Which property of cryptographic hash functions makes this attack computationally difficult?

   • ADeterminism
   • BPreimage resistance
   • CAvalanche effect
   • DCollision resistance
   Reveal Solution Discussion Select an answer first
6. 30foundation · easy

   What does a digital signature provide in a blockchain transaction?

   • AConfidentiality of the transaction data
   • BAnonymity of the sender
   • CEncryption of the transaction for privacy
   • DAuthenticity, integrity, and non-repudiation
   Reveal Solution Discussion Select an answer first