Blinding Attack on RSA Signatures
This blog primarily focuses on Blinding Attack- an elementary vulnerability in unpadded RSA digital signature algorithm that can be exploited to forge signatures. The working and properties of Digital Signatures will be described before directly jumping onto the attack. In the end, we discuss ways to prevent this attack. Unpadded Digital Signatures using RSA RSA is a kind of Trapdoor One-way Function. Wikipedia describes a one-way function as a function that is easy to compute on every input, but hard to invert given the image of a random input. Here, “easy” and “hard” are to be understood in the sense of computational complexity theory, specifically the theory of polynomial time problems. ...