Paper 2021/1173

Lelantus Spark: Secure and Flexible Private Transactions

Aram Jivanyan, Firo, Yerevan State University
Aaron Feickert, Cypher Stack
Abstract

We propose a modification to the Lelantus private transaction protocol to provide recipient privacy, improved security, and additional usability features. Our decentralized anonymous payment (DAP) construction, Spark, enables non-interactive one-time addressing to hide recipient addresses in transactions. The modified address format permits flexibility in transaction visibility. Address owners can securely provide third parties with opt-in visibility into incoming transactions or all transactions associated to the address; this functionality allows for offloading chain scanning and balance computation without delegating spend authority. It is also possible to delegate expensive proving operations without compromising spend authority when generating transactions. Further, the design is compatible with straightforward linear multisignature operations to allow mutually non-trusting parties to cooperatively receive and generate transactions associated to a multisignature address. We prove that Spark satisfies formal DAP security properties of balance, non-malleability, and ledger indistinguishability.

Note: Addresses a denial-of-service reported by Luke Parker (kayabaNerve).

Metadata
Available format(s)
PDF
Category
Cryptographic protocols
Publication info
Published elsewhere. 6th Workshop on Trusted Smart Contracts
Contact author(s)
aram @ firo org
aaron @ cypherstack com
History
2022-06-02: last of 7 revisions
2021-09-14: received
See all versions
Short URL
https://ia.cr/2021/1173
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2021/1173,
      author = {Aram Jivanyan and Aaron Feickert},
      title = {Lelantus Spark: Secure and Flexible Private Transactions},
      howpublished = {Cryptology ePrint Archive, Paper 2021/1173},
      year = {2021},
      note = {\url{https://eprint.iacr.org/2021/1173}},
      url = {https://eprint.iacr.org/2021/1173}
}
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