Escrito 09 March 2004 - 07:39 AM
This will likely be my last post regarding this subject until "AVHDD part 2" or similar appears in the future.
"Me nah sun, oh two car aye sum ah"
re: 2004.Mar.06 (Sat) AVHDD crack [56] Verdict: Failure
Corrections are welcome.
Comments in [] are mine and not C2BF author's nor the machine translation (parts that the machine failed to translate). Some comments are used to fill-in words that are implied, while others are my personal comments. First the machine translation of C2BF author's comments, then my translation. Computer translation (sentence) used: t-mail.com / dictionaries (words) used: goo.ne.jp & WWWJDIC. Rest is human translation.
[Online computer translation (T-Sail: Full & Magic):]
Failure decision of AVHDD crack. It probably cannot go something. But as for possibility being highest when with C2 code S-Box has been modified CPPM or CPRM or AVHDD or classified by use... DVD the DVD recorder of Audio/CPRM DVD-RAM both correspondence will such a difficult thing probably as expected be executed to being?
Well, DVD Video being encoded with CSS, from the ["ru"], must correspond to which being full plural codes, because, already 1 type increasing, however perhaps it is not many problem. After, in case of AVHDD when is, because encoding and decoding are completed inside the tip/chip, there is also a possibility C2 cryptographic standard even with mounting which is different without of becoming problem, but it is certainly it is, but it is with will Matsushita which is shipping the DVD Audio corresponding prayer or the CPRM DVD-RAM recorder as the product specially do such a thing? (You use normally there and don't turn? If company internal communication is bad, discord between the division is difference but
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Obtaining - with, it included to S-Box, entire it hits and is not popular. [start *1] in the past, [end *1] but when it is combination of 256, as for probability of correct answer 1 (256! ) Being to become. Being not to be able to read the age of the participant, when you write once! With the calculation sign, factorial, mathematics of high school (probability statistics) with you are taught. 256! The 256~255~254~...... it becomes the calculation, ~1, but when it tries calculating in trial, you are disgusted and that it is the ["ya"] useless, you think that anyone can be agreed upon.
[*1: URL link to AVHDD crack [3] entry]
Furthermore considering to possibility of modification of Matsushita mounting in addition to S-Box, when it is the story which you say because possibility furthermore it spreads explosively, the hand you will acquire, but it becomes without.
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The algorithm of S-Box or C2 which are used for the latest entire hitting does not think if in the sense, agreement with DVD Audio, being something which can have self-confidence in that appearance, because it did, was completely ["gase"] with. The basis of judgement being not to be able to reveal, it does, but.
[Computer (goo.ne.jp & WWWJDIC) + human translations:]
The verdict is in -- AVHDD crack has failed. [I wonder] what went wrong[?]. The highest probable cause [for the failure] is that there were modifications in the S-Box for CPPM / CPRM / AVHDD in the C2 code.... [I wonder if encryption specs(?)] would go ahead and implement such combersome [methodology], considering [there are units like] DVD recorders supporting both DVD Audio / CPRM DVD-RAM[?].
[One could argue] that DVD Video already uses CSS code, adding 1 more code [type] shouldn't be a problem, because [such units] must support multiple code [types].
Futhermore, in AVHDD's case, [the unit] is doing the coding & decoding within the [built-in] chip [set]. There is a possibility, really, that won't be a problem even if C2 code standard has a different implementation [from AVHDD]. Would [companies like] Matsushita [a.k.a.: Panasonic, JVC, Quasar, Technics, etc.] take such trouble [with encyption?] of shipping out [units like] CPRM DVD-RAM recorders and [DVD] players that support DVD Audio[?]. (wouldn't [they] normally share [such technology]? But things would be different if there's communication problems within different [company] divisions)
[another one long sentence with multiple commas...; I hope I understood C2BF author's comments corrrectly]
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Ummm, [I] will not be doing distributed computing that includes S-Box. As [I] have written [*1 start] previously [*1 end], the possibily [for finding] the correct 256 [bit key] is 1/(256!). [odds are "one in 256 factorial" -- rest is untranslated; read summary for basic problem]
[*1: URL link to AVHDD crack [3] entry]
[summary: odds for finding a 256 bit key is "1 in 10^420" (1 with 400+ zeros); put in another way, while C2BF'ing a 56 bit was done in a few months, 256 bit will take roughly a few months multiplied by "1 with about 80 zeros"]
Furthermore, should there be a possibility of having to take into account that Matsushita will implement modification to S-Box, the possibility [of what?] will increase exponentially, which would be [well] beyond [my] reach.
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If it means the algorithm used on this round of distributed computing on S-Box and C2 conforms to DVD Audio [format], [this] was a confidence building [experience] in itself, [so I] didn't consider [what?] was a complete lie/fake. [However], I cannot reveal the basis for my decision.
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