TY - RPRT TI - 6th annual PKI R&D workshop "Applications-Driven PKI" proceedings AU - Polk, William T AU - Seamons, Kent PY - 2007 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST IR 7427 DO - 10.6028/NIST.IR.7427 ER -