3 ms·
It doesn't have to know the private key, just the public one, woth the private being on the virus-owner's side. Furthermore, it's possible to encrypt each file
by kolinko 12y ago
It doesn't have to know the private key, just the public one, woth the private being on the virus-owner's side.
Furthermore, it's possible to encrypt each file with a different key so one public key would only deceypt one file.
Oh, and a fun fact - with the newest cryptography algorithms it's even possible to modify the files without knowing what they contain. If I'm not mistaken it would even be possoble to create a software that can conpute checksums of files without knowing the file contents.
- Osmium 12y ago> Oh, and a fun fact - with the newest cryptography algorithms it's even possible to modify the files without knowing what they contain. If I'm not mistaken it would even be possoble to create a software that can conpute checksums of files without knowing the file contents. To my knowledge, this is only true in a purely academic (not practical) sense at present. There do exist homomorphic encryption schemes but current implementations are ridiculously slow.