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Bug found in Decoy algorithm for privacy coin Monero

Bug found in Decoy algorithm for privacy coin Monero
CoinDesk Analysis TeamCoinDesk Analysis TeamCoinDesk

A “significant” bug, with the potential to expose users’ transaction details, has been spotted in the privacy-centric cryptocurrency Monero (XMR), according to a Twitter post on Tuesday.

  • The bug, identified in Monero's decoy selection algorithm, occurs when a user spends their funds received in a transaction before roughly 20 minutes has passed.

  • There is a "good probability" the output of the new transaction can be identified as the true transaction, according to the tweet.

  • XMR allows users to conceal their transactions by including worthless coins known as “mixins” along with the actual coins they spend in a given transaction.

  • "This does not reveal anything about addresses or transaction amounts ... This bug persists in the official wallet code today," said Monero.

  • Users may avoid the bug altogether by waiting one hour or more before spending their newly-received Monero until a fix is implemented in a future wallet software update.

  • A hard fork is not required to fix the bug, Monero said.

  • U.S. Software developer Justin Berman first spotted the bug.

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CoinDesk Analysis Team

CoinDesk is the media platform for the next generation of investors exploring how cryptocurrencies and digital assets are contributing to the evolution of the global financial system.

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