Users should save a copy of this file as soon as they realize that their computers have been infected with TeslaCrypt so they can later use it with the Cisco tool. ![]() The researchers developed a tool that can decrypt files affected by TeslaCrypt if the master encryption key is still found in key.dat. Some versions of TeslaCrypt store the encryption key in a file called key.dat on infected systems, but others delete it after they finish encrypting files and store an encrypted version of it in a different file called RECOVERY_KEY.TXT, the Cisco researchers said Monday in a blog post. This algorithm uses the same key for both encryption and decryption. However, after analyzing the malicious program, researchers from Cisco’s Talos Group found that it actually uses a symmetric encryption algorithm called AES.
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