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No, this is totally wrong, you didn't think this through. They don't need to do that. They could just copy the files to their own machine, delete them, then send them back when you pay the ransom. Encryption certainly makes it easier for them, but the main thing that enables it is money laundering. Which is the primary reason anyone uses cryptocurrency to transfer huge sums of money.

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Could sure, but that’s not how ransomware typically works. Typically, it is a non interactive process that is enabled by automated application of strong encryption delivered via a binary payload. It is encryption that puts the user in danger of malicious intent not the payment rails. Before Bitcoin, LR ukash and shady payment card processors handled this. Cryptocurrency is just a better rail, so good guys and bad guys use it.

Is your problem with the network enabling crime? (Internet?)

Cryptocurrency is not a better rail. In fact it is a worse rail for almost everything. But it is the only rail that currently allows people to do this at the scale it does, due to its operators openly welcoming unlimited amounts of money laundering on the network. This has nothing to do with cryptography or the internet. It is entirely about money laundering. Yes, money laundering happened before, that is not an excuse for these networks to allow it to happen in such large volumes and at such great speed that it is enabling this entire new class of ransomware.

POWERFUL TECHNOLOGY!

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