4 ms·

If the encryption is done badly, it's also sometimes possible to recover a shadow of an encrypted image from the cyphertext without actually decrypting it: htt

• dogma1138 11y ago
  Close enough it's even worse since with video you have to preserve the frame structure so even less of the "data" is actually encrypted. The scrambling/encryption it self is not ECB but when you brute force the keys you get the same effect as ECB encryption and images, you basically then run some basic analysis usually FFT which alerts you that a candidate image has been reconstructed if it's good enough you can take it, if it's not the correct value usually can be then guesstimated based on the key that has generated an image that cam close enough. This is how these systems tend to work https://en.wikipedia.org/wiki/Conditional_access https://en.wikipedia.org/wiki/Conditional_access
• tptacek 11y ago
  Much worse things than that happen if you use ECB mode, for whatever it's worth. But yeah, I was trying to figure out if he was talking about some property of the cipher or some property of "encrypting analog video".