The companion program password4 creates password for a given site by encrypting FNV-1a hash of site identifier with Speck128/256 on the key passed via environmental variable CRYPTOLOCKER_PASSWORD. Unlike Dual_EC_DRBG, Speck construction is very simple so there does not seem to be any place for the backdoor, but if that's still a concern for you and NSA is in your threat model, use something else.īest practice is to use a cryptographic library instead of rolling your own crypto, but that would bring in a large external dependency. Because of that it is viewed with suspicion by at least some in the cryptographic community. Speck cipher was developed by NSA and its release coincided with Snowden revelations. Key length is 256 bit, so if the password is more than 32 bytes long then only the first 32 bytes are used. Finally, the malware creates a file in each affected directory linking to a web page with decryption instructions that require the user to make a. 7 random characters, depending on the variant. No password stretching or KDF, encryption key is just zero-padded password, so use a long password. CryptoLocker uses an RSA 2048-bit key to encrypt the files, and renames the files by appending an extension, such as. To cross-compile Windows executable on Linux, install MinGW-w64.
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