7 replies to this topic

[Alireza_1387]

Hi everyone .

I want Encrypt a video file(like avi , mkv and etc) and decrypt it .

Is there some library in c# for doing that?

Something like DirectX can do it?

Edited by Alireza_1387, 01 July 2015 - 04:09 AM.

[lespauled]

If you want to send personal videos to others, there are better ways to do it.  Encryption is one of the last options

[WingedPanther73]

Do you mean something like zip with encryption, or something else?

[Alireza_1387]

I want it for military project .We take frames from video and divide it to tiles and change the tiles' places . and this is an encryption . 

[WingedPanther73]

While this sounds like very, very weak encryption, it's really going to depend on the specific file format.

[DarkLordCthulhu]

I suggest studying cryptography.  I've just recently started learning cryptography, so I don't know much about it, but I do know you can XOR a file with a pseudorandomly generated stream of bits of the same length to implement stream cypher encryption.  XOR is great for encryption because the encryption and decryption algorithms are the same.  You run the same program to decrypt a file that you run to encrypt it.  Cryptography is pretty fascinating stuff, really.

[WingedPanther73]

I'll add on, I've had the fortune/misfortune of dealing with some military subcontractors. They take encryption VERY seriously. I have a feeling your proposal will not be acceptable for military use.

[MuStA]

I'd also addon to the above, I'd not consider myself a cryptogrophy professional, but you may want to consider encrypting the whole file byte by byte, and restore it to it's original form once needed. This allows you to use stronger encryption methods such as AES with a very strong key, and bytes manipulation.