Quantum resistant blockchain and cryptocurrency, the full analysis in seven parts. Part 6 D (Quantum hijacks during block time)


You can read part 1 here, part 2 here, part 3A here, part 3B here, part 3C here, part 4A here, part 4B here, and part 4C here, and part 4D here, part 5 A here, part 5 B here, part 5 C here part 5 D here, and part 5 E here

Introduction: Part 6 A here, part 6 B here, part 6 C here 

An attack during moment number 2: Hijacks during blocktime

This paper describes how you could hijack a transaction and make a new transaction of your own, using someone else’s address and send his coins to an address you own during moment number 2: During blocktime, the time the nodes verify the transaction:

“(Unprocessed transactions) After a transaction has been broadcast to the network, but before it is placed on the blockchain it is at risk from a quantum attack. If the secret key can be derived from the broadcast public key before the transaction is placed on the blockchain, then an attacker could use this secret key to broadcast a new transaction from the same address to his own address. If the attacker then ensures that this new transaction is placed on the blockchain first, then he can effectively steal all the bitcoin behind the original address.” (Page 8, point 3.)

So this means that BTC obviously is not a quantum secure blockchain. Because as soon as you will touch your funds and use them for payment, or send them to another address, you will have to make a transaction and you risk a quantum attack.

- 6 E: An attack during moment number 2: Hijacks pre-blocktime

- 6 F: An attack during moment number 1: MITM attacks

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Allen Walters
Allen Walters

Fascinated by blockchain and future proofing cryptocurrency. Discover the tech before it gets relevant. Twitter: @IgnoranceIt


Quantum resistant blockchain in 7 parts
Quantum resistant blockchain in 7 parts

Quantum resistant blockchain and cryptocurrency, the full analysis in seven parts.

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