Michael Semanko

The One-More-RSA-Inversion Problems and the Security of Chaum's Blind Signature Scheme

Chanathip Namprempre, Mihir Bellare, David Pointcheval, 2003, Journal of Cryptology.

The Power of RSA Inversion Oracles and the Security of Chaum's RSA-Based Blind Signature Scheme

Chanathip Namprempre, Mihir Bellare, David Pointcheval, 2002, Financial Cryptography.