Digital Wallets: Cryptography and Secure Key Storage Quiz
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Questions and Answers

What does the term 'crypto' mean in the context of cryptography?

  • Cryptography (correct)
  • Cryptanalysis
  • Cryptocurrency
  • Cryptogram

    • Which cryptographic primitive involves the use of both public and private keys?

  • Block Cipher
  • Stream Cipher
  • Digital Signature (correct)
  • Symmetric Key Cryptography

    • What is the primary function of a hash function in cryptography?

  • Digital signing
  • Data encryption
  • Data integrity verification (correct)
  • Key exchange

    • Which cryptographic primitive relies on the difficulty of solving the discrete logarithm problem?

    <p>Diffie Hellman (DH)</p> Signup and view all the answers

    Which cryptographic primitive is associated with the integer factorization problem (IFP)?

    <p>RSA</p> Signup and view all the answers

    Which type of cryptography is vulnerable to attacks from quantum computers?

    <p>Post-Quantum Cryptography</p> Signup and view all the answers

    What type of key is characterized as speedy, simple, and short-lived for secure communications?

    <p>Symmetric key</p> Signup and view all the answers

    Which key type has a public and secret key pair, with the public key shareable and the private key required to be stored securely?

    <p>Asymmetric key</p> Signup and view all the answers

    What is the purpose of encryption in cryptography?

    <p>Converting plaintext message into ciphertext using a key</p> Signup and view all the answers

    What is the characteristic of a hash function that ensures for a given input, the output (hash) is always the same?

    <p>Deterministic</p> Signup and view all the answers

    Which type of cryptographic primitive is known for its application in secure communication, data storage, online transactions, and more?

    <p>Symmetric key</p> Signup and view all the answers

    Which cryptographic primitive is characterized as slow and generally long-lived?

    <p>Public key</p> Signup and view all the answers

    What is the security goal associated with the use of encryption in cryptography?

    <p>Data confidentiality</p> Signup and view all the answers

    Which cryptographic primitive has the characteristic of being fixed output size regardless of input size?

    <p>Hash function</p> Signup and view all the answers

    What is the main consideration for key management in encryption and decryption operations?

    <p>Storing keys securely</p> Signup and view all the answers

    What does the avalanche effect refer to in a hash function's characteristics?

    <p>Minor change in input produces major change in output</p> Signup and view all the answers

    Lecture 2 of CYBERUS focuses on the Technical Basics of building trust in digital wallets, covering topics such as Cryptographic Primitives, Asymmetric Cryptography, Advanced Cryptography, Post-Quantum Cryptography, Secure Communication, and Secure Hardware. One of the Cryptographic Primitives discussed is the use of both public and private keys, known as ______ Cryptography.

    <p>Asymmetric</p> Signup and view all the answers

    In the context of Cryptographic Primitives, one of the methods for key establishment is the use of RSA and Elliptic Curves, which is known as the Key Establishment Method in ______ Cryptography.

    <p>Asymmetric</p> Signup and view all the answers

    The lecture also covers Advanced Cryptography, including the concept of Merkle Proofs and ECC Pairings. ECC Pairings are part of the Advanced Cryptography section and are used in ______ Cryptography.

    <p>Asymmetric</p> Signup and view all the answers

    To counter quantum threats, the lecture discusses Post-Quantum Cryptography, which aims to provide security against quantum attacks. One of the methods used in Post-Quantum Cryptography is the Integer Factorization Problem (IFP), associated with ______.

    <p>RSA</p> Signup and view all the answers

    The lecture also addresses the concept of Secure Communication, including Digital Wallet Remote Use Case and Digital Wallet Proximity Use Case. These use cases are related to ______ Communication.

    <p>Secure</p> Signup and view all the answers

    In the context of Secure Hardware, the lecture discusses the Technological Evolution and Revocation and Backup. The security of Secure Hardware relies on the difficulty of solving the ______ Problem.

    <p>Discrete Logarithm</p> Signup and view all the answers

    Symmetric Keys: A shared secret [k] § Speedy and simple § Short-lived for secure communications § Long-lived for secure datastores

    <p>key</p> Signup and view all the answers

    Asymmetric Keys: A public and secret key ______ [pk, sk] § Slow and generally long-lived § Public key can be shared with anybody § Private key [sk] has to be stored securely

    <p>pair</p> Signup and view all the answers

    Encryption ______: Converting plaintext message [m] into ciphertext [c] using a key [k]

    <p>Ek(m) = c</p> Signup and view all the answers

    Decryption ______: Converting ciphertext [c] into plaintext message [m] using a key [k]

    <p>Dk(c) = m</p> Signup and view all the answers

    Hash Function Characteristics § Deterministic: For a given input, the output (______) is always the same

    <p>hash</p> Signup and view all the answers

    Fixed Output Size: Regardless of input size, the output hash is always of a fixed ______

    <p>length</p> Signup and view all the answers

    Avalanche Effect: A minor change in input produces a major change in the ______

    <p>output</p> Signup and view all the answers

    Pre-Image Resistance: Difficult to find the original input given a ______. Best via brute-force with O(n) = 2n-1 average

    <p>hash</p> Signup and view all the answers

    Second Pre-Image Resistance: Difficult to find a d.

    <p>hash</p> Signup and view all the answers

    The Journey Ahead Keys are like the keys to your home; guard them well and use the right one for the right lock, and if you share your keys, ensure trust to share only with trustworthy parties. § Application: Encryption, MAC, AEAD § Problem: Key establishment and key storage Examples of secure key sizes for reference (BSI, 2023) sk ______

    <p>pk</p> Signup and view all the answers

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