Indeed; this is why provable security is so important: http://www1.icsi.berkeley.edu/~luby/PAPERS/blind.ps http://www1.icsi.berkeley.edu/~luby/PAPERS/blind.ps

Indeed; this is why provable security is so important: http://www1.icsi.berkeley.edu/~luby/PAPERS/blind.ps http://www1.icsi.berkeley.edu/~luby/PAPERS/blind.ps http://eprint.iacr.org/2011/316.pdf http://eprint.iacr.org/2011/316.pdf http://www.cs.umd.edu/~jkatz/papers/blind_sigs-proc.pdf http://www.cs.umd.edu/~jkatz/papers/blind_sigs-proc.pdf