January 15, 2002
Practical Aspects of Modern Cryptography
Greatest Common Divisors
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gcd(A , B) = gcd(B , A - B)
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gcd(21,12) = gcd(12,9) = gcd(9,3)
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= gcd(6,3) = gcd(3,3) = gcd(0,3) = 3
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gcd(A , B) = gcd(B , A mod B)
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gcd(21,12) = gcd(12,9) = gcd(9,3)
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= gcd(0,3) = 3
