Cryptography

Which key is used for only one session?

• Master Key
• Data Key
• Session Key
• Public Key

How is a master key usually protected?

• Encrypted with AES
• Stored in a cloud server
• Secure hardware and access control
• Shared with all users

What problem arises when every pair of devices needs a key?

• Key management becomes complex
• Data gets lost
• Too many certificates
• Nothing happens

Why can’t a master key be encrypted like other keys?

• It is too large
• Would require another key, creating a loop
• It is not used often
• It is always public

Which technique helps manage keys in a large system?

• Hashing
• Firewall
• Hierarchical Key Control
• Compression

What does AES stand for?

• Advanced Encryption Standard
• Authenticated Exchange System
• Automated Encryption Service
• Advanced Entry Security

Which key protects other keys?

• Public Key
• Session Key
• Data Key
• Master Key

What is the role of a KDC in symmetric key distribution?

• Store user passwords
• Generate session keys
• Encrypt files
• Create digital signatures

How is data commonly protected in cryptography?

• Watermarking
• Hashing only
• Encryption
• Compression

Which key type is long-term and rarely changes?

• Session Key
• Master Key
• Symmetric Key
• Private Key