@book{1991-davies ,title={{Advances in cryptology---EUROCRYPT '91: proceedings of the workshop on the theory and application of cryptographic techniques held in Brighton, April 8--11, 1991}} ,booktitle={{Advances in cryptology---EUROCRYPT '91: proceedings of the workshop on the theory and application of cryptographic techniques held in Brighton, April 8--11, 1991}} ,author={Donald W. Davies} ,ISBN={3--540--54620--0} ,MR={94b:94003} ,publisher={Springer-Verlag} ,address={Berlin} ,series={Lecture Notes in Computer Science} ,volume={547} ,year={1991} }