Ron, Adi and Leonard is a funny crypto challenge, based on RSA, in particular in this challenge the exponent e is very big, then the ciphertext is vulnerable to Wiener’s attack.

Wiener’s attack, is an attack that use the continued fraction method to expose the private key d when d is small. For more information visit the wikipedia webpage

For this challenge we have found a script in this git repository:, modify for our purpose and run it:

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Interessant Security/Hacking books:

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