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Open AccessArticle

Provably Secure Covert Communication on Blockchain

Physiological Signal Analysis Team, Center for Machine Vision and Signal Analysis, University of Oulu, P.O. Box 5000, FI-90014 Oulu, Finland
Cryptography 2018, 2(3), 18; https://doi.org/10.3390/cryptography2030018
Received: 29 June 2018 / Revised: 9 August 2018 / Accepted: 13 August 2018 / Published: 20 August 2018
(This article belongs to the Special Issue Advances of Blockchain Technology and Its Applications)
Blockchain is a public open ledger that provides data integrity in a distributed manner. It is the underlying technology of cryptocurrencies and an increasing number of related applications, such as smart contracts. The open nature of blockchain together with strong integrity guarantees on the stored data makes it a compelling platform for covert communication. In this paper, we suggest a method of securely embedding covert messages into a blockchain. We formulate a simplified ideal blockchain model based on existing implementations and devise a protocol that enables two parties to covertly communicate through the blockchain following that model. We also formulate a rigorous definition for the security and covertness of such a protocol based on computational indistinguishability. Finally, we show that our method satisfies this definition in the random oracle model for the underlying cryptographic hash function. View Full-Text
Keywords: cryptography; steganography; privacy; random oracle model cryptography; steganography; privacy; random oracle model
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Partala, J. Provably Secure Covert Communication on Blockchain. Cryptography 2018, 2, 18.

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