Ransomware attacks are typically carried out using a Trojan, entering a system through, for example, a malicious attachment, embedded link in a Phishing email, or a vulnerability in a network service. At no point is the attacker's private key exposed to victims and the victim need only send a very small ciphertext (the encrypted symmetric-cipher key) to the attacker. The symmetric key is randomly generated and will not assist other victims. The victim deciphers the encrypted data with the needed symmetric key thereby completing the cryptovirology attack.
It zeroizes the symmetric key and the original plaintext data to prevent recovery. This is known as hybrid encryption and it results in a small asymmetric ciphertext as well as the symmetric ciphertext of the victim's data.
It uses the public key in the malware to encrypt the symmetric key. To carry out the cryptoviral extortion attack, the malware generates a random symmetric key and encrypts the victim's data with it.The attacker generates a key pair and places the corresponding public key in the malware.Cryptoviral extortion is the following three-round protocol carried out between the attacker and the victim.
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It is called cryptoviral extortion and it was inspired by the fictional facehugger in the movie Alien. The concept of file-encrypting ransomware was invented and implemented by Young and Yung at Columbia University and was presented at the 1996 IEEE Security & Privacy conference.
The victim's personal data or perpetually block access to it unless a ransom is paid. Ransomware is a type of malware from cryptovirology that threatens to publish