How to construct random functions
Journal of the ACM (JACM)
CT-RSA '02 Proceedings of the The Cryptographer's Track at the RSA Conference on Topics in Cryptology
ICISC '01 Proceedings of the 4th International Conference Seoul on Information Security and Cryptology
CRYPTO '89 Proceedings of the 9th Annual International Cryptology Conference on Advances in Cryptology
k-anonymity: a model for protecting privacy
International Journal of Uncertainty, Fuzziness and Knowledge-Based Systems
Digitally signed document sanitizing scheme based on bilinear maps
ASIACCS '06 Proceedings of the 2006 ACM Symposium on Information, computer and communications security
Efficient signature schemes supporting redaction, pseudonymization, and data deidentification
Proceedings of the 2008 ACM symposium on Information, computer and communications security
Minimal information disclosure with efficiently verifiable credentials
Proceedings of the 4th ACM workshop on Digital identity management
Minimal credential disclosure in trust negotiations
Proceedings of the 4th ACM workshop on Digital identity management
Privacy-enhancing methods for e-health applications: how to prevent statistical analyses and attacks
International Journal of Business Intelligence and Data Mining
Aggregate and verifiably encrypted signatures from bilinear maps
EUROCRYPT'03 Proceedings of the 22nd international conference on Theory and applications of cryptographic techniques
Privacy-preserving electronic health records
CMS'05 Proceedings of the 9th IFIP TC-6 TC-11 international conference on Communications and Multimedia Security
ESORICS'05 Proceedings of the 10th European conference on Research in Computer Security
Extended sanitizable signatures
ICISC'06 Proceedings of the 9th international conference on Information Security and Cryptology
Redactable Signatures for Signed CDA Documents
Journal of Medical Systems
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Digital signatures are an invaluable tool to provide a means for verifying the integrity and authenticity of digital medical documents. Since these documents may be used by several parties in medical treatment processes, the aforementioned properties are essential. However, the general principle of digital signatures is all or nothing. This means, that given a digital signature it is only possible to verify whether it is valid for the entire document or not. Nevertheless, often there is a necessity that only a part of a already signed medical document is relevant in a subsequent process, e.g. in case of second opinions. Another scenario is the anonymization of medical documents for clinical studies, where the holder of a document solely wants to disclose parts of the document, i.e. for privacy reasons. Consequently, the original signature cannot be used to verify the integrity and authenticity of the "redacted" document anymore. Hence, the receiver of this redacted document needs to fully trust the content of the document. In this paper we propose a novel concept to solve the aforementioned problem. It is based on so called redactable signatures, which were recently introduced, and allow parties to remove certain parts of a document while preserving the property of verifiability. However, when dealing with documents based on the clinical document architecture (CDA), all existing redactable signatures fail to be really practical. To overcome the problems and shortcomings of existing redactable signatures we propose a novel concept of generalized redactable signatures which is especially applicable for structured documents, e.g. XML documents. Additionally, we will show that our solution can be used to sign partial information of CDA documents, which cannot be realized efficiently with existing solutions (e.g. XML signatures), when the redacted information can be chosen arbitrarily. Finally, the proposed concept provides a solution to an unsolved problem in context of secure eHealth architectures that are based on anonymization.