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For the point P (11, 2) defined in the curve E13(1, 1). What is –P?

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For the point P (11, 2) defined in the curve E13(1, 1). What is –P?

(a) (12,4)

(b) (10,7)

(c) (11,11)

(d) (11,12)

The question was posed to me during a job interview.

This key question is from Elliptic Curve Arithmetic/Cryptography topic in portion Other Public Key Cryptosystems and Cryptographic Hash Functions of Cryptograph & Network Security

1 Answer

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Best answer
The correct answer is (c) (11,11)

Best explanation: The inverse of P(11,2) is (11,11) or (11,-2).

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