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@inproceedings{PLA91g, author = {Bernhard Plattner}, title = {Security Capabilites of X.509: Evaluation and Constructive Criticism}, address = {Zurich}, booktitle = {Proc. of the IFIP WG 6.5 Symposium on Message Handling Systems and Application Layer Protocols}, publisher = {North Holland}, month = {Jan}, year = {1991} }