{"id":1328,"date":"2016-09-29T08:29:18","date_gmt":"2016-09-29T08:29:18","guid":{"rendered":"https:\/\/prismacloud.eu\/?p=1328"},"modified":"2017-05-23T12:20:07","modified_gmt":"2017-05-23T12:20:07","slug":"signer-anonymous-designated-verifier-redactable-signatures-for-cloud-based-data-sharing","status":"publish","type":"post","link":"https:\/\/prismacloud.eu\/signer-anonymous-designated-verifier-redactable-signatures-for-cloud-based-data-sharing\/","title":{"rendered":"Signer-Anonymous Designated-Verifier Redactable Signatures for Cloud-Based Data Sharing"},"content":{"rendered":"<p style=\"text-align: justify;\"><strong>Authors<\/strong><\/p>\n<p style=\"text-align: justify;\">David Derler (Graz University of Technology), Stephan Krenn (AIT Austrian Institute of Technology), Daniel Slamanig (Graz University of Technology)<\/p>\n<p style=\"text-align: justify;\"><strong>Abstract<\/strong><\/p>\n<p style=\"text-align: justify;\">Redactable signature schemes allow to black out predefined parts of a signed message without affecting the validity of the signature, and are therefore an important building block in privacy-enhancing cryptography.\u00a0However, a second look shows, that for many practical applications, they cannot be used in their vanilla form. On the one hand, already the identity of the signer may often reveal sensitive information to the receiver of a redacted message; on the other hand, if data leaks or is sold, everyone getting hold of (redacted versions of) a signed message will be convinced of its authenticity.\u00a0We overcome these issues by providing a definitional framework and practically efficient instantiations of so called signer-anonymous designated-verifier redactable signatures (AD-RS). As a byproduct we also obtain the first group redactable signatures, which may be of independent interest. AD-RS are motivated by a real world use-case in the field of health care and complement existing health information sharing platforms with additional important privacy features. Moreover, our results are not limited to the proposed application, but can also be directly applied to various other contexts such as notary authorities or e-government services.<\/p>\n<p style=\"text-align: justify;\"><strong>Venue<\/strong><\/p>\n<p style=\"text-align: justify;\">15th International Conference on\u00a0Cryptology and Network Security, CANS 2016 (http:\/\/cans2016.di.unimi.it\/)<\/p>\n<p style=\"text-align: justify;\"><strong>Place and Date<\/strong><\/p>\n<p style=\"text-align: justify;\">Milan, Italy, November 14-16, 2016<\/p>\n<p style=\"text-align: justify;\"><strong>Publication Reference<\/strong><\/p>\n<p style=\"text-align: justify;\">David Derler, Stephan Krenn, and Daniel Slamanig. \u201cSigner-Anonymous Designated-Verifier Redactable Signatures for Cloud-Based Data Sharing\u201c, in: CANS 2016, LNCS, Milan\/Italy, Springer. (in press)<\/p>\n<p style=\"text-align: justify;\">[<a href=\"http:\/\/eprint.iacr.org\/2016\/1064\">Download<\/a>]<\/p>\n<p style=\"text-align: justify;\"><strong>Bibtex<\/strong><\/p>\n<pre style=\"text-align: justify;\"><code>@inproceedings{dekrsl16,<\/code> <code>\u00a0 Author \u00a0 \u00a0 = {David Derler and Stephan Krenn and Daniel Slamanig},<\/code> <code>\u00a0 Title \u00a0 \u00a0 = {{Signer-Anonymous Designated-Verifier Redactable Signatures for Cloud-Based Data Sharing}},<\/code> <code>\u00a0 Booktitle \u00a0= {CANS 2016},<\/code> <code>\u00a0 Publisher\u00a0 = {Springer},<\/code> <code>\u00a0 year = {2016},<\/code> <code>\u00a0 series = {LNCS},<\/code> <code>\u00a0 note = {(in press)}<\/code> <code>}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>David Derler, Stephan Krenn, and Daniel Slamanig. \u201cSigner-Anonymous Designated-Verifier Redactable Signatures for Cloud-Based Data Sharing\u201c, in: CANS 2016, LNCS, Milan\/Italy, Springer. (in press)<\/p>\n","protected":false},"author":2,"featured_media":746,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,8],"tags":[],"_links":{"self":[{"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/posts\/1328"}],"collection":[{"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/comments?post=1328"}],"version-history":[{"count":5,"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/posts\/1328\/revisions"}],"predecessor-version":[{"id":1937,"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/posts\/1328\/revisions\/1937"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/media\/746"}],"wp:attachment":[{"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/media?parent=1328"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/categories?post=1328"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/prismacloud.eu\/wp-json\/wp\/v2\/tags?post=1328"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}