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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.The notion of using public key cryptography for data kidnapping attacks was introduced in 1996 by Adam L. Young and Yung critiqued the failed AIDS Information Trojan that relied on symmetric cryptography alone, the fatal flaw being that the decryption key could be extracted from the Trojan, and implemented an experimental proof-of-concept cryptovirus on a Macintosh SE/30 that used RSA and the Tiny Encryption Algorithm (TEA) to hybrid encrypt the victim's data.
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 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.Unfortunately, cyber criminals have been able to leverage Power Shell for their attacks for years.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.
Unlike the previous Gpcode Trojan, Win Lock did not use encryption.