
1) Cryptographic attack
Found on
https://www.crosswordclues.com/clue/cryptolocker

CryptoLocker was a ransomware trojan which targeted computers running Microsoft Windows and was first observed by Dell SecureWorks in September 2013. CryptoLocker propagated via infected email attachments, and via an existing botnet; when activated, the malware encrypts certain types of files stored on local and mounted network drives using RSA pu...
Found on
http://en.wikipedia.org/wiki/CryptoLocker
No exact match found.