idea for encrypted codec

[razorblade2]

Hi,

I was wondering, wouldn't it be possible to create a codec that basically functions as a "loader" above for example a divx codec, but that adds an encryption layer.

That way, you could take the advantage of divx compression and combine it with for example twofish encryption...

I didn't find such a codec before, but it would't be great in my eyes.

Let me know what you think, I don't guess that it's really difficult to make such a codec...

Cheers,

Razor:D

[Tuning]

what is the advantage of encypting ? :confused:

[Leak]

Originally posted by Tuning
what is the advantage of encypting ? :confused:

"Parental lockout"? Naaah...

@razorblade: Why not just use an encrypted part of your filesystem to store the naughty stuff? ;)

np: Yoko Kanno - The Clone (Earth Girl Arjuna OST Into The Another World)

[razorblade2]

Well the advantage: you can post your content anywhere on the inet, but you can control who watches it. Please dont talk parental lockout that's bullshit, no way my mum is gonna now how to encrypt/code divx/xvid.

Cheers, razor

[stephanV]

isnt what you want called DRM?

[razorblade2]

If you are talking micro$oft, but besides that's only for .wmv
and it's not easy, "my" method is easy, just a password and go!

cheers,

Razor

[stephanV]

but then your just basically looking for a way to encrypt a file, not necessarily a video file. isnt there anything out there that can do that?

[razorblade2]

True, i could just encrypt the .avi to an .enc(rypted).
But, then I wouldn't be able to playback in real time.
I would need to decode first, plus that I would not be
able to use streaming avi (asf) encrypted

cheers,

Razor

[stephanV]

i believe streaming avi is not practically possible (avi is not asf!, asf is practically the same as your hated wmv)

from alexnoe's site (the truths and myths part) (http://www-user.tu-chemnitz.de/~noe/Video-Zeug/AVIMux%20GUI/en_myths.html)
AVI is not streamable:
Partially true. It is not possible to entirely stream AVI output. When writing AVIs with AVI-Mux GUI, two seek operations are necessary after each Gigabyte of data.
It is possible to create AVI files that can be read in streaming mode, without any seeking. It's not my fault is there is no filter available which makes use of that possibility without using special methods to convince it to.

so you might rethink your plans a little...

[ac-chan123]

You can use dscrypt for this. It´s a Directshow encpytor.
http://corecodec.homeunix.org:8884/corecodecdotorg/cgi-bin/viewcvs.cgi/vfre/DSCrypt/DSCrypt.cpp?rev=1.3

[Atamido]

Part of the Matroska specs includes a section to allow encryption of arbitrary content. It even allows you to encrypt tracks individually, or in multiple layers.

Unfortunately at this point this functionality has not yet been built into the Matroska Splitter. However, jcsston is currently working on this and it may be fixed soon.

[esby]

encrypting content sounds like a bad dream for me.

Unless you have very specific security issue linked to the video content, i see no serious reason to add a stupid lockout.

If you want to share material with people,
(supposed you are granted to do it by the (c) owner or the licencer owner, do it freely, or charges for your redistribution cost if you are really low in money.)
Or check to who you are sharing it, cause even if you plan on using DRM, don't forget that someone with the file can still retape it and serves an un(censored) crypted version, on which you'll have no control.

And finally, don't be as stupid as music industry or movie one,
which forgot that they money they think they gain by using DRM system will be equally proportionnal to the money that they will give (and lose) to the DRM system owner and controller. Remembers Citizen Kane, and try to guess why microsoft or other companies are pushing up DRM like system... not necessary or really to protect (c), but more to gain money from offering a service (and forcing customers using it) than anything else...

esby

And if you want to encrypt media, just encrypt the file with a strong key (4096bits) and a strong algorithm, and you'll be sure that the person who will watch it will be the one having the right key (but not necessary only the ones you think...)

[cheerow]

You could also use a tool like PGP-disk which creates a mountable disk from an encrypted file. Store your video in it and you can watch it with on-the-fly decryption. Such a file is also easy to share.