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Questions tagged [unlinkability]

Unlinkability of two items means that an adversary cannot determine if the items are related. It is often a goal in systems dealing with anonymity and other forms of privacy.

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Separate Messages Encryption

In a public key system, Alice sends Bob separate messages telling him information about the time T and place P they would meet, encrypted with Bob's public key. What is the most secured protocol: <...
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1 vote
1 answer
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Algorithm for anonymous but associated communications from a set of verified communicants?

Let's say that I'm selling a product, and I want to get authentic feedback from my customers. However, I have the following two constraints: My customers must be able to give [at least some of] their ...
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1 vote
1 answer
153 views

blind signature

Reading this paper, I have some questions about blind signatures What is the meaning for unlinkability of blind signatures? I searched wiki, but still cannot understand exactly. In blind signatures (...
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1 vote
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Linkable ECDSA like signature [closed]

In our process of digital checks for banking - which needs to work online and offline - the receiver needs to know the chain of all generated signatures without consulting an Internet service. In this ...
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6 votes
1 answer
823 views

How secure is a blind signature?

From Wikipedia: Blind signatures can also be used to provide unlinkability, which prevents the signer from linking the blinded message it signs to a later un-blinded version that it may be ...
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2 votes
2 answers
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Choice of bilinear group for implementation of BLS signature with NIWI proof?

I am trying to sign the multiple (millions of) different readings but the receiver should not be able to link multiple signed readings together (unlinkability) or with the identity of the signer (...
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3 votes
0 answers
193 views

Unlinkability of Merkle-Damgård hash function results

Question: Are multiple outputs of a Merkle-Damgård hash function (or specifically SHA-256, if this can only be said for a specific algorithm) on unknown data unlinkable? If yes: Can this be formally ...
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