![]() Payloads may display a fake warning purportedly by an entity such as a law enforcement agency, falsely claiming that the system has been used for illegal activities, contains content such as pornography and "pirated" media. The program then runs a payload, which locks the system in some fashion, or claims to lock the system but does not (e.g., a scareware program). 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. The attacker receives the payment, deciphers the asymmetric ciphertext with the attacker's private key, and sends the symmetric key to the victim.The victim sends the asymmetric ciphertext and e-money to the attacker. ![]() #BITDEFENDER FREE DOWNLOAD FR WIN XP SP 3 HOW TO#It puts up a message to the user that includes the asymmetric ciphertext and how to pay the ransom. 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.
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