Hyperledger: The “payload” Field of Transactions in a Block Reveals the Private Data to All Peers

To whom it may concern, We are a research group conducting research on Hyperledger Fabric 2.0. We find a design flaw about the “payload” field of transactions, which can reveal the Private Data to all peers in one channel. When a client invokes a function to read the private data, the is stored i...

Monero: Exploiting Network and Timing Side-Channels to Break Monero Receiver Anonymity

Summary: We present various examples of side-channel leakage in the communication between a Monero wallet and P2P node. Communication patterns and timing leak whether the wallet is the payee of a transaction that is sent into the transaction pool or mined in a block—thereby breaking transaction...