Crypto / DRM: Difference between revisions
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''The Randomseed for software based PRNG is just time, allowing you to predict the seed due to low entropy'' | ''The Randomseed for software based PRNG is just time, allowing you to predict the seed due to low entropy'' | ||
<ref>The choice of a good random seed is crucial in the field of computer security. When a secret encryption key is | <ref>The choice of a good random seed is crucial in the field of computer security. When a secret encryption key is pseudo-randomly generated, having the seed will allow one to obtain the key.</ref> | ||
<references>http://en.wikipedia.org/wiki/Random_seed</references> | <references>http://en.wikipedia.org/wiki/Random_seed</references> | ||
Revision as of 15:46, 11 January 2016
Update: AES Content Keys
AES Content Keys
84 41 07 03 DA A8 4E 86 AC D4 F4 DF A2 44 1F 37
Boot Signature
/BOOT/SESS/STRT/bsig=DL_GameDev-0012345-Exampl-Devel-Test1&vers=PG&edtn=0
(Not posting actual bsig of games or apps to stop this from being fixed before its useful)
First 2 bytes of the sig "0012345" are dev specific and dont change when an update or patch is issued.
3rd Byte is predictable based on prior update for the application.
/BOOT/SESS/HRDW/mntd=1&knct=0
(Extra Auth/Boot Signature ID)
Retail BootSigID Update 1: e9b803
dbf4c9a69f7cc46952e9b803
Retail BootSigID Update 2: f3df56
dbf4c9a69f7cc46952f3df56
/BSID/STR0/TLM3/data=dbf4c9a6 (8 Bytes)
/BSID/STR1/TLM3/data=9f7cc469 (8 Bytes)
/BSID/STR2/TLM3/data=52UPDATE (8 Bytes)
Last 6 bytes of /STR2/ change every time a new update or patch is issued. Others stay constant and are app specific.
/BSID/STR0/STR1/bsid=dbf4c9a69f7cc46952UPDATE (24 Bytes)
Updates for certain apps and games can be skipped by making the BootSig and the BootSigID match the most recent patch when the check is done.
Note: Some apps also check "minRequiredAppVersion".
Compression & Encryption
Some games are packaging game updates/script files with lzma. After you decompress the lzma the files you get have an additional layer of encryption.
Registry
HardwareId= getRegistry().hardwareId
Manufacturing Id= getRegistry().hardwareId:sub(1, 4)
Model Id= getRegistry().hardwareId:sub(1, 8)
registerStateType(default, cancel, reset)
PseudoRandom Number Generator
math.randomseed(Time)
The Randomseed for software based PRNG is just time, allowing you to predict the seed due to low entropy
- ↑ The choice of a good random seed is crucial in the field of computer security. When a secret encryption key is pseudo-randomly generated, having the seed will allow one to obtain the key.
Video DRM
PlayReady
PlayReady DRM (used by PS4/PS3 Netflix e.g.) - note: 4K is not supported as that would require PlayReady 3.0
Marlin
Marlin DRM (used by PS4/PS3/PSP)
Advanced Access Content System (AACS)
AACS (used by BluRay Video / BD]
AES encrypted video
AES-128 (used for Live Streaming?)
AMD64 has AES-NI support
Key selection vector (KSV)
Content Scramble System (CSS)
CSS (used by DVD-Video)
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