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參數(shù)資料
| 型號： | L13-PALLADIUM |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Palladium, Zero Knowledge |
| 中文描述： | 鈀，零知識 |
| 文件頁數(shù)： | 7/7頁 |
| 文件大?。?/td> | 150K |
| 代理商： | L13-PALLADIUM |
3.4
Applying ZK to Palladium
7
Figure 5: Information gained by Verifier after t iterations of above communication protocol
This gives us a triple (
u,b,l
) which we claim is indistinguishable from the actual transcript generated
by the Prover-Verifier protocol above. (This is for an honest verifier. If the verifier actually generates
b
in some other way, such as making it depend on
u
, then this simulation needs to be modified by
filtering the output appropriately. Details omitted in this class. But in any case, the Verifier can
simulate the distribution on transcripts, which proves that the protocol is ZK.)
A much more general and wonderful result is also known. Indeed, for any polynomial time program
P
, I can convince you (in zero knowledge) that I know
x
,
y
,
z
, etc. such that
P
(
x,y,z,...
) = true,
where
P
() is some polynomial time program. Clearly, this is quite a powerful cryptographic tool.
3.4
Applying ZK to Palladium
The Secure Support Component (SSC) of Palladium is a hardware module that can perform certain
cryptographic operations as well as securely store one or more cryptographic keys. It has the public-
private key pair (
SK
0
,
PK
0
) that is burned into the machine (as we mentioned earlier).
I want to convince a CA in zero-knowledge that I know
SK
0
,
PK
0
,
C
0
,
SK
1
such that:
-
SK
0
is the secret key for
PK
0
-
C
0
is a certificate from Dell on
PK
0
-
SK
1
is the secret key for
PK
1
(CA knows
PK
1
)
At this point if the CA is convinced it returns
cert
(
PK
1
). Thus the CA can certify
PK
1
without
knowing how to link it to the original public key
PK
burnt into the SSC by the manufacturer.
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