Undeniable signature

BCDP91 Joan Boyar, David Chaum, Ivan Damgard, Torben Pedersen Convertible Undeniable Signatures Crypto 90, LNCS 537, Springer-Verlag, Berlin 1991, 189-205. 

CBDP91 David Chaum, Joan Boyar, Ivan Damgard, Torben Pedersen Undeniable Signatures Applications and Theory manuscript, Matematisk Institut, Arhus, July 1, 1991. 

ChAn90 David Chaum, Hans van Antwerpen Undeniable signatures Crypto 89, LNCS 435, Springer-Verlag, Heidelberg 1990,212-216. 

Chau91 David Chaum Zero-knowledge undeniable signatures Eurocrypt 90, LNCS 473, Springer-Verlag, Berlin 1991,458-464. 

Chau91a David Chaum Some Weaknesses of Weaknesses of Undeniable Signatures Eurocrypt 91, LNCS 547, Springer-Verlag, Berlin 1991,554-556. 

Invisible signatures (usually, but not characteristically called undeniable ) are a kind of signatures providing more privacy than ordinary ones. 

This last feature gave rise to the original name undeniable . However, it is a feature common to all signature schemes and therefore not characteristic. Moreover, the old terminology is very confusing with the noun undeniability It meant both that signatures cannot be denied and the characteristic feature that they cannot be shown round, which is called invisibility here. 

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