Cyber Security Jobs Cryptography and Encryption 1 — Questions and Answers
Question 1: What does AES stand for in the context of cryptography?
- Advanced Encryption Standard (Correct answer)
- Asymmetric Encryption System
- Automated Encoding Scheme
- Applied Encryption Service
Correct answer: Advanced Encryption Standard
AES (Advanced Encryption Standard) is a symmetric block cipher adopted by NIST in 2001 and widely used for data encryption.
Question 2: Which type of encryption uses the same key for both encryption and decryption?
- Symmetric encryption (Correct answer)
- Asymmetric encryption
- Public-key encryption
- Hybrid encryption
Correct answer: Symmetric encryption
Symmetric encryption uses a single shared key for both encrypting and decrypting data, making key distribution a critical challenge.
Question 3: What is the primary purpose of a cryptographic hash function in cybersecurity?
- Verifying data integrity (Correct answer)
- Encrypting data for secure transmission
- Generating asymmetric key pairs
- Compressing files for storage
Correct answer: Verifying data integrity
Hash functions produce a fixed-length digest of data, allowing verification that data has not been altered, which is central to integrity checking.
Question 4: RSA is a well-known example of which category of cryptographic algorithm?
- Asymmetric encryption (Correct answer)
- Symmetric encryption
- Stream cipher
- Hash function
Correct answer: Asymmetric encryption
RSA uses a public/private key pair, classifying it as an asymmetric (public-key) algorithm used for encryption and digital signatures.
Question 5: What is the main purpose of a digital signature in cybersecurity?
- To verify the authenticity and integrity of a message (Correct answer)
- To encrypt the message content for confidentiality
- To compress digital files before transmission
- To generate symmetric session keys
Correct answer: To verify the authenticity and integrity of a message
A digital signature proves that a message came from a specific sender and has not been tampered with, addressing both authenticity and integrity.
Question 6: Which of the following is classified as a symmetric encryption algorithm?
- AES (Correct answer)
- RSA
- ECC (Elliptic Curve Cryptography)
- Diffie-Hellman
Correct answer: AES
AES is a symmetric block cipher; RSA, ECC, and Diffie-Hellman are all asymmetric or key-exchange algorithms.
Question 7: What does PKI stand for in the context of digital certificates and encryption?
- Public Key Infrastructure (Correct answer)
- Private Key Interface
- Protected Knowledge Index
- Public Knowledge Integration
Correct answer: Public Key Infrastructure
PKI (Public Key Infrastructure) is the framework of hardware, software, policies, and procedures used to create, manage, and revoke digital certificates.
Cyber Security Jobs Cryptography and Encryption 1
What does AES stand for in the context of cryptography?