<div dir="ltr">I currently have 2 proposals for efficiently proving the knowledge of a RSA and an ECDSA signature posted on stackexchange but without having received relevant answers regarding their security or possible improvements that could be made to them.<div>Perhaps someone who is familiar with the topic could have a look.</div><div>Links are:</div><div>Proving the knowledge of an RSA signature by proving the knowledge of an e-th root: <a href="https://crypto.stackexchange.com/questions/81094/proving-the-knowlege-of-e-th-root-in-an-non-interactive-way">https://crypto.stackexchange.com/questions/81094/proving-the-knowlege-of-e-th-root-in-an-non-interactive-way</a></div><div>Proving the knowledge of an ECDSA signature: <a href="https://crypto.stackexchange.com/questions/81089/is-this-a-safe-way-to-prove-the-knowledge-of-an-ecdsa-signature">https://crypto.stackexchange.com/questions/81089/is-this-a-safe-way-to-prove-the-knowledge-of-an-ecdsa-signature</a></div></div>