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 https://en.wikipedia.org/wiki/Wiener%27s_attack.
For this challenge we have found a script in this git repository: https://github.com/MxRy/rsa-attacks/blob/master/wiener-attack.py, modify for our purpose and run it:
Interessant Security/Hacking books: