Another attack, implemented on ECDSA and similar in spirit (though not the same attack) is in Sean Devlin's Set 7 of Cryptopals:
https://toadstyle.org/cryptopals/61.txt
Another attack, implemented on ECDSA and similar in spirit (though not the same attack) is in Sean Devlin's Set 7 of Cryptopals:
https://toadstyle.org/cryptopals/61.txt