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Which attack requires the least effort/computations?

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in Cryptograph & Network Security by (60.1k points)
Which attack requires the least effort/computations?

(a) Pre-image

(b) Second Pre-image

(c) Collision

(d) All required the same effort

This question was posed to me by my school teacher while I was bunking the class.

This intriguing question comes from Hash Functions Based on Cipher Block Chaining in portion Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

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Best answer
Right answer is (c) Collision

To explain: Due to the birthday paradox it requires 2^(m/2) computations only.

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