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Find a number ‘a’ between 0 and 9 such that ‘a’ is congruent to 7^1000 mod 10.

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in Cryptograph & Network Security by (60.1k points)
Find a number ‘a’ between 0 and 9  such that ‘a’ is congruent to 7^1000 mod 10.

(a) 2

(b) 1

(c) 3

(d) 4

This question was posed to me in my homework.

The question is from Number Theory topic in portion More Number Theory of Cryptograph & Network Security

1 Answer

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Best answer
Correct answer is (b) 1

To explain: Use Eulers Theorum.

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