Video Encryption

What is Video Encryption?

Video encryption is a very useful method for stopping unwanted interception and viewing of all videos submitted or other information, for example, from a video surveillance and the right to be transmitted to a central display center.

Scrambling is the easy part. It 's the non-encryption that difficult, but there are several available techniques. However, the human eye is very good, spotting distortions in the image due to poorvideo decoding or poor choice of video scrambling hardware. Therefore, it is very important to the hardware or video broadcasts can be non-secure or your decoded video may not choose watchable.

Some of the most common techniques are listed below:

Line Reversal:

Method: All or part of the signal scan lines are reversed.

Advantages: Simple, low-cost video encoding.

Disadvantages: Poor quality video decoding, dark low, lowSecurity.

Sync Suppression:

Method: Remove skin, / synchronizes the horizontal and vertical.

Advantages: Provides a convenient solution for encryption and provides good quality video decoding.

Disadvantages: This method is incompatible with some distribution equipment. Darkness (ie how easy it is to visually decipher the image) depends on the video content.

Line Shuffle

Method: Each signal line is re-arranged on the screen.

Advantages: Provides a compatibleVideo signal, a reasonable amount of obscurity, good decode quality.

Disadvantages: Requires a lot of digital space. There are potential problems with the stability of the video. Less sure of the cut and rotate encryption method (see below)

Cut & Rotate:

Scrambling Method: Each scan line is cut to pieces and again in a different order.

Advantages: Provides a compatible video signal, is an excellent amount of obscurity, and decode a good quality andStability.

Disadvantages: It can control the timing requires special equipment and complex scrambling

The cutting and rolling video encryption method is probably the best way to get reliable, high quality video encoding is an example of correct application of this system in the second Viewlock

Implementation Vice Scrambling

The hardware video encoding, in particular, the decoder should function correctly even if it is a strong example (from whatcommonly called "snow" on the screen known. "Snow" is when we can see on the TV screen, often seen in poor reception areas) or unstable signal. If the connection should be encrypted signal to stop working, this should not be a problem. The connection between the video encoder and video decoder should move away quickly and decryption.

The nature of the systems of surveillance cameras is that they often are in the open air, as has been maintained to be able to vagaries of weather. Videoencryption hardware should be stable under or protected from the effects of rain, sun, extreme heat and cold. It must not be damaged if it is a peak power in the supply chain. In these systems the video encoder is a wireless signal to the central decoder video before it is displayed, it must of course be that the act of spreading the signal has no effect on the hardware and the hardware video encoding video encoding does not affect on radioTransmitter.

The most important point is that the video coding system should be safe, or what? It 'amazing how some encryption methods can be cracked easily. For example, some cable TV channels 'encrypt' their channel broadcasts via a relatively complex method of the United Nations, which will be easily deciphered a number of cheap bits of electronics from Radio Shack. That would be illegal, of course! The encryption method of cable TV is very rough, usually only dynamicallychange the vertical sync signal, so that the TV for no real obstacle, and so it rolls at random.

The other extreme is the encoding of the video signal output too, so it is expensive both in equipment and time for video on the receiving side. Remember this is a broadcast "live" video from a scrambling display 'live' video decryption follows. ANY-mail may be copied, because enough money and time, but makes this process as hard as possible to be useful, since at leastDelays when illegal copies will be available.

Finally, and most obviously, each user must have a unique key, so that other users of the system can not, however, the video broadcast by accident or purpose without the owner's knowledge of the key. The total number of possible user keys must be such that it is highly unlikely that anyone has to guess the right key.