Mathematical Methods of Cryptography and Steganography

One-time ring signature in e-cash

G. O. Chikishev

National Research University of Information Technologies, Mechanics and Optics, St. Petersburg

Abstract: Ring signature allows to specify a set of potential message signers instead of the actual signer. In this paper, a new signature type is introduced – the one-time ring signature which allows to sign only one message. The use of the same secret key twice reveals signer's identity. A protocol for untraceable payments in Bitcoin e-cash system is also offered.

UDC: 519.7