CompChall: Addressing Password Guessing Attacks. - Vipul Goyal; Virendra Kumar; Mayank Singh 002; Ajith Abraham; Sugata Sanyal (IACR Cryptol. ePrint Arch., 2004)

A new protocol to counter online dictionary attacks. - Vipul Goyal; Virendra Kumar; Mayank Singh 002; Ajith Abraham; Sugata Sanyal (Comput. Secur., 2006)