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The attacker keeps the corresponding private decryption key private.Young and Yung's original experimental cryptovirus had the victim send the asymmetric ciphertext to the attacker who deciphers it and returns the symmetric decryption key it contains to the victim for a fee.Long before electronic money existed Young and Yung proposed that electronic money could be extorted through encryption as well, stating that "the virus writer can effectively hold all of the money ransom until half of it is given to him.Even if the e-money was previously encrypted by the user, it is of no use to the user if it gets encrypted by a cryptovirus". A, Archiveus, Krotten, Cryzip, and May Archive began utilizing more sophisticated RSA encryption schemes, with ever-increasing key-sizes. AG, which was detected in June 2006, was encrypted with a 660-bit RSA public key.The scam hit numerous users across Russia and neighboring countries—reportedly earning the group over US million.In 2011, a ransomware Trojan surfaced that imitated the Windows Product Activation notice, and informed users that a system's Windows installation had to be re-activated due to "[being a] victim of fraud".However, one high-profile example, the "Wanna Cry worm", traveled automatically between computers without user interaction.Starting from around 2012 the use of ransomware scams has grown internationally.

While the malware claimed that this call would be free, it was routed through a rogue operator in a country with high international phone rates, who placed the call on hold, causing the user to incur large international long distance charges.In a recent report, the application was found to be involved in nearly 40% of endpoint security incidents.In August 2010, Russian authorities arrested nine individuals connected to a ransomware Trojan known as Win Lock.Ransomware is a type of malicious software from cryptovirology that threatens to publish the victim's data or perpetually block access to it unless a ransom is paid.While some simple ransomware may lock the system in a way which is not difficult for a knowledgeable person to reverse, more advanced malware uses a technique called cryptoviral extortion, in which it encrypts the victim's files, making them inaccessible, and demands a ransom payment to decrypt them.

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The Crypto Locker technique was widely copied in the months following, including Crypto Locker 2.0 (though not to be related to Crypto Locker), Crypto Defense (which initially contained a major design flaw that stored the private key on the infected system in a user-retrievable location, due to its use of Windows' built-in encryption APIs), These LNK shortcut files install Locky ransomware by automating infection operations rather than relying on traditional user downloads of WSF files—all of which is made possible by the universal Power Shell Windows application.