[Cryptography] "WannaCry" ransomware has any payment resulted in a key?

[Phillip Hallam-Baker]

http://thehackernews.com/2017/05/wannacry-ransomware-decryption-tool.html

So not only was there no way to pay up, turns out that they didn't delete
the private key from memory.

Very interesting.

Was this ransomware or merely a large scale attack pretending to be
ransomware?
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