Geodesic
Extending the functionality of blind accumulators: contexts
Journal of the Belarusian State University. Mathematics and Informatics, Tome 1 (2024), pp. 79-85

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Blind accumulators collect private keys of eligible entities in a decentralised manner not getting information about the keys. Once the accumulation is complete, an entity processes the resulting accumulator and derives a public key which refers to a private key previously added by this entity. We extend the blind accumulator scheme with the context functionality so that the derived key is bound to a specific context and this key is computationally hard to associate with public keys of other contexts. Blind accumulators with contexts are useful in various e-voting scenarios, for example in revoting. We provide an instantiation of the extended blind accumulator scheme and justify its security.
Keywords: E-voting; revoting; cryptographic accumulator; blind accumulator; decisional Diffie – Hellman problem 
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S. V. Agievich; M. A. Kazlouski. Extending the functionality of blind accumulators: contexts. Journal of the Belarusian State University. Mathematics and Informatics, Tome 1 (2024), pp. 79-85. http://geodesic.mathdoc.fr/item/BGUMI_2024_1_a6/