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Which of the following is an example of passive reconnaissance?

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Which of the following is an example of passive reconnaissance?

(a) Telephonic calls to target victim

(b) Attacker as a fake person for Help Desk support

(c) Talk to the target user in person

(d) Search about target records in online people database

The question was posed to me in an internship interview.

My question is based upon Generic Steps for Security in portion Cyber Security of Cyber Security

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Correct answer is (d) Search about target records in online people database

The explanation: Passive reconnaissance is all about acquiring of information about the target indirectly, hence searching any information about the target on online people database is an example of passive reconnaissance.

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