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Henrich C. Pöhls
Kai Samelin
Joachim Posegga
Hermann de Meer
Mergeable Redactable Signatures with Signer Commitment and Applications
State-of-the-art private redactable schemes (RSS) allow the signer to un-detectably add new elements to signed data after signature generation. We introduce a RSS with a signer commitment: it prohibits any party – including a malicious signer – from adding new elements after signature generation. This protects against a malicious signer and allows using RSS for applications like timestamping. Moreover, we introduce another practically useful property: private mergeability. It allows merging two redacted versions of the same signed document into a single document with one signature. We show that neither mergeability nor signer commitment negatively impact the existing security proper- ties. We present a provably secure redactable signature scheme that is committing, mergeable, unforgeable, private and transparent. The performance analysis of our implementation shows its practicality.
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(Transparent Mergeable Redactable Signatures with Signer Commitment and Applications)
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