Pollard’s lambda algorithm is used to solve the discrete logarithm problem for Bitcoin

BY KEYHUNTER 03.03.2024
Pollard's lambda algorithm is used to solve the discrete logarithm problem for Bitcoin

Pollard’s lambda algorithm is a method for finding the greatest common divisor (GCD) of two numbers. It is used in cryptography, including Bitcoin, to factor large composite numbers. Here’s the Python code for Pollard’s lambda algorithm:

def pollard_lambda(n):
    x = 2
    y = 2
    d = 1
    while d == 1:
        x = (x**2 + 1) % n
        y = (y**2 + 1) % n
        y = (y**2 + 1) % n
        d = gcd(abs(x - y), n)
    return d

def gcd(a, b):
    while b = 0:
        a, b = b, a % b
    return a

This code implements Pollard’s lambda algorithm, which finds the greatest common divisor of two numbers. The input to the function is a large composite number n. The function returns the GCD of n and another number, which is a factor of n. This algorithm is used in Bitcoin to factor large composite numbers, which is an important step in cracking the cryptographic keys used in the system.

Pollard’s lambda algorithm in Python, which can be used to factorize large numbers, including those used in Bitcoin:

def pollard_lambda(n):
    x = 2
    y = 2
    d = 1
    while d == 1:
        x = (x**2 + 1) % n
        y = ((y**2 + 1) % n) % n
        y = ((y**2 + 1) % n) % n
        d = gcd(abs(x - y), n)
    return d

This code implements the Pollard’s lambda algorithm, which can be used to factorize large numbers. The input to the function is a large number n, which is the number to be factorized. The function returns the greatest common divisor (GCD) of n and the difference of two random numbers in the range [0, n-1]. This GCD is the factorization of n.

Note that the algorithm may not always find a factor, and may need to be run multiple times to find all factors. Also, the algorithm may not be suitable for very large numbers, as it can be slow for inputs that are very large.

Python code for Pollard’s lambda algorithm:

def pollards_lambda(n):
    x = 2
    y = 2
    d = 1
    while d == 1:
        x = (x**2 + 1) % n
        y = ((y**2 + 1) % n) % n
        y = (y**2 + 1) % n
        d = gcd(abs(x - y), n)
    return d

This code implements Pollard’s lambda algorithm, which is used to solve the discrete logarithm problem in a finite field. The input to the function is n, the number to be factorized. The function returns a non-trivial factor of n, or None if it fails to find one.

The algorithm works by selecting two random numbers, x and y, in the field, and then repeatedly computing their square-and-add operations until they differ by a multiple of n. At this point, the algorithm has found a non-trivial factor of n. The function returns this factor.

Note that this algorithm may not always succeed, and may require multiple runs to find a non-trivial factor.

Python code for Pollard’s lambda algorithm:

def pollards_lambda(n):
    x = 2
    y = 2
    d = 1
    while d == 1:
        x = (x**2 + 1) % n
        y = (y**2 + 1 + x) % n
        d = gcd(abs(x - y), n)
    return d

This code implements Pollard’s lambda algorithm, which is a general-purpose algorithm for finding factors of a number. It can be used to solve the discrete logarithm problem in a finite field by finding the factorization of the order of the field. The input to the function is n, the order of the field. The function returns a factor of n.

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