What is CSS (Content Scrambling System) |
Content Scrambling System (CSS) is used on DVDs to encrypt the data so that only licensed DVD players can decode it. It is also used in variant forms to implement a challenge-response protocol between DVD player software on a PC and a DVD drive (ATAPI or SCSI) attached to that PC, and to decrypt the title key (the CSS key for a file) from the disk key and player key. In all there are four variant forms of CSS.
CSS is a very simple encryption scheme based on shifts, XORs and table lookups. Its keylength is 40 bits, although it has been shown elsewhere that a brute force attack is only O(2^25) and a plaintext attack is only O(2^18) - i.e. CSS is weak for its keylength.
This document describes the CSS algorithm in enough technical detail to implement it. I also describe the plaintext attack, which is for academic benefit only since all the valid player keys are already known. Finally I describe the disk authentication procedure, which is quite involved and difficult to extract from the Mount Fuji document.
For reference, a CSS implementation is provided in source code form; this is not in a format that can be readily converted to a program as this might potentially violate the Digital Millenium Copyright Act; however it should serve as useful reference material for those wishing to implement CSS on their own.
|
Specification: |
Authentication is a process for a DVD drive and CSS Decryption module to recognize (or authenticate) each other. It is necessary before reading data from DVD discs. Authentication keys are used for this process.
Title keys are used for scrambling and descrambling actual data on DVD discs called titles. A title could be a complete motion picture, a trailer or similar self-contained unit.
Disc keys are used for decrypting title keys on DVD discs.
Player keys are used for decrypting disc keys on DVD discs. Each DVD player manufacturer is allocated one of approximately 400 player keys to incorporate in its players.
|
Remove CSS (Content Scrambling System) |
There are kinds of DVD ripper software can remove CSS(Content Scrambling System), but want to choose the best one is difficulty,. Now let's remmend one for you --- DVD Ripper Wizard
- Remove CSS protections automatically!
- Compared with other DVD ripper, DVD Ripper Wizard has more settings to customize and it is easier than ever. Whether you are a veteran or beginner, you will feel DVD Ripper Wizard is developed for you to convert DVD movie!
- Providing you excellent image/sound quality, smaller file size, and just a few clicks in DVD convert, DVD Ripper Wizard is really your best choice to convert DVD.
- Easy-to-use DVD ripping software which can help you rip DVD movie in smaller but quality video files. It can help you backup DVD movies to MPEG2 and MPEG4 files.
- DVD Ripper Wizard converts DVD to AVI, DVD to DIVX, DVD to Xvid with excellent image and sound.
- DVD Ripper Wizard is a DVD audio ripper which can extract movie soundtrack from DVDs and rip DVD audio to AC3. It supports multi-lingual audio exporting such English, Chinese and French etc.
- High ripping speed and separated chapter ripping makes DVD Ripper Wizard more powerful.
|
| Download DVD Ripper Wizard free version and have a try(2.3MB) |
|
|
| Great benefits DVD Ripper Wizard full version can bring to you: |
 |
DVD Ripper Wizard is an outstanding DVD converter software, which can enable you to convert DVD to almost all video formats, such as convert DVD to VCD, convert DVD to WMV, rip DVD to XviD and so on. High ripping speed and separated chapter ripping makes DVD Ripper Wizard more powerful.
- Convert DVD to VCD with amazing image.
- High ripping speed and separated chapter ripping.
- Easy to use - Convert whole DVD movie by one click.
- 30 days money back guarantee
|
|
| 100% Satisfaction Guarantee! |
|
|
DVD Ripper Wizard key features:
- Convert DVD to almost all popular video formats
- Rip CSS protected DVD movies
 Download Now
|
|
DVD Ripper Wizard main functions:
|
|
