Q11mediumIn a public key system, if Bob wants to send a confidential message to Alice, he should encrypt it with:ABob's Private KeyBAlice's Public KeyCAlice's Private KeyDBob's Public KeyCheck AnswerReveal Answer & ExplanationDiscuss on Board
Q12mediumAn attacker has a list of password hashes. They pre-compute hashes for all common passwords (like '123456', 'password'). What is this attack called?ADenial of Service AttackBRainbow Table AttackCSocial Engineering AttackDBrute-Force AttackCheck AnswerReveal Answer & ExplanationDiscuss on Board
Q13easyWhat is Kerckhoffs's Principle?AThe key should be very long.BThe algorithm should be patented.CA cryptosystem should be easy to remember.DA cryptosystem should be secure even if everything about the system, except the key, is public knowledge.Check AnswerReveal Answer & ExplanationDiscuss on Board
Q14easyIn a Hybrid Encryption system (like TLS/SSL), how are symmetric and asymmetric keys used?AAsymmetric encryption is used to securely exchange a symmetric "session key," which is then used to encrypt the bulk data.BOnly Symmetric is used.COnly Asymmetric is used.DSymmetric is for authentication; Asymmetric for speed.Check AnswerReveal Answer & ExplanationDiscuss on Board
Q15easyWhat is "Collision Resistance" in a hash function?AThe hash function is very fast.BThe ability to produce the same hash for different inputs.CThe hash output is very long.DIt should be computationally infeasible to find two different inputs that produce the same hash output.Check AnswerReveal Answer & ExplanationDiscuss on Board