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Anonymous credential systems allow users to obtain certified credentials from organizations and use them later without being traced. For instance, a student will be able to prove, using his student card certified by the University, that he is a student living e.g. in Hangzhou without revealing other information given by the student card, such as his name or studies. Besides, sanitizable signatures enable a designated person, called the sanitizer, to modify some parts of a signed message in adoi:10.1145/2484313.2484363 dblp:conf/ccs/CanardL13 fatcat:av5sdmff4bcdzgdupzrmrxplve