@conference {speed09, title = {Secure Direct and Iterative Protocols for Solving Systems of Linear Equations}, booktitle = {Signal Processing in the Encrypted Domain (SPEED) Workshop}, year = {2009}, month = {September}, pages = {122{\textendash}141}, address = {Lausanne, Switzerland}, keywords = {iterative protocol, privacy, security, systems of linear equations, watermarking}, author = {Juan Ram{\'o}n Troncoso-Pastoriza and Pedro Comesa{\~n}a and Fernando P{\'e}rez-Gonz{\'a}lez} }