General > General Technical Chat
Anyone play with ciphers?
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dietert1:
Have a look here: synopsys.com/content/dam/synopsys/verification/datasheets/hspice-ds.pdf:

--- Quote ---Triple DES Encryption
HSPICE offers robust 192-bit encryption compliant with Triple Data Encryption
Standards (DES). This feature enables users to distribute their HSPICE custom netlists
and models without revealing sensitive information. Third-party recipients of encrypted...

--- End quote ---

Elsewhere i found the file looks like this:
.SUBCKT Encrypt 1 2 3
.prot
RR1 1 2 100 DTEMP=-8.149999999999977
RR2 2 3 100 DTEMP=-8.149999999999977
RR3 3 0 100 DTEMP=-8.149999999999977
.unprot
.ENDS

Regards, Dieter
amyk:
I really don't understand how they can claim "without revealing sensitive information" when the user has both the ciphertext and the key. Then again, most hardware people probably don't understand much about software either ::)
NiHaoMike:

--- Quote from: amyk on August 27, 2020, 03:17:21 am ---I really don't understand how they can claim "without revealing sensitive information" when the user has both the ciphertext and the key.

--- End quote ---
Just like other DRM schemes. Which is to say that a determined hacker can break it pretty easily.
T3sl4co1l:
Heh well, obviously this version isn't DES, so there's that.

I've seen a number of files that contain three sections, "strong" "normal" and "weak" or something like that, there does seem to be some option there, at least from newer versions.  (The newer versions being big blocks of hex, with no obvious pattern by eye, though I've only glanced at them.)  But that also means they're practically giving away the plaintext and hoping you don't crack their other modes, which just looks... amusing? :-DD

Tim
dietert1:
You shouldn't be inviting people to waste their time with nonsense. Inviting people to try and crack a DES cipher or any other serious cipher may be creating hundreds or thousands of wasted hours and frustration. Please stop that.

Regards, Dieter
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