Zonet weer interessant antwoord gekregen van SmartDTV, een van de andere CI+ forumleden over welke tv's CI+ kunnen supporten:
Dear Sir,Thanks for your request.CI+ standard need new SW from iDTV to support new protocol and maybe new hardware tosupport copy protection. As we don't know iDTV architecture, only your iDTV manufacturer can answer to thisquestion.Best regards,Dimitri.SmarDTV Support.ref:00D254j7.50023aAaR:ref
Staaft met het antwoord wat ik van Philips gekregen heb, nl. dat middels een firmware upgrade CI+ gesupport zal worden (op mijn recente nieuwe 52PFL9703H !!!) omdat de architectuur er inmiddels is.
Wellicht dat deze televisie reeds de certificaten aan boord heeft....
BTW Certificaten kunnen wel degelijk gegenereerd worden zonder dat er een TA aanwezig is ! Sterker nog zal het certificaat gewoon te bewerken zijn door de eigenaar mocht deze dat willen. Wat men zal zien is dat de TA
binnen het netwerk zal kijken of hetzelfde certificaat meerdere keren tegenkomt (gekopieerd!!!) en deze uiteindelijk gaan blocken. De private key bij een device (televisie in deze) komt alleen van de Root CA af !
Ik zou zeggen....lees onderstaande excerpt uit de draft van CI+......
9.1 Introduction
3 The authentication between a CI+ host and module includes the exchange of certificates. A device
4 certificate of a host or module serves three purposes.
5
• prove that the device is compliant with the CI+ standard
6 • provide an RSA public key of the device. This key is used for verification of the device's
Diffie-Hellman public key during the authentication protocol, see figure 791H6.2 and table 792H7 6.1
8 • convey the device scrambler capabilities
9 Certificates are also used to verify the integrity of revocation lists that are included in the broadcast.
10 This verification makes use of the service operator certificate, see section Error! Reference source
11
not found..
793H
12 9.2 Certificate Management Architecture
13 The CI+ trust hierarchy is organized as a tree structure with a single Root CA (=Root of Trust,
ROT). There is only one tree for all participants in CI+, See Figure
794H14 9.1.
Root CA
(ROT)
Brand A Brand B Service Operator
C
Host X Module
Z
Host Y
15
Figure
795H16 9.1: Certificate Hierarchy Tree
17 There are four different types of certificates.
18
• Root certificate
19 - issued by the ROT
20 - self-signed
21 - only one root certificate exists for all of CI+
22 • Brand certificate
23 - issued by the ROT
24 - signed with the private key of the root certificate
25 - one certificate of this type exists for each brand
26 • Device certificate
27 - issued by the ROT
28 - signed with the private key of the brand certificate
29 - each single device has a unique device certificate
30 • Service operator certificate
© 2007 Matsushita Electric Industrial Co., Ltd
© 2007 Koninklijke Philips Electronics N.V
© 2007 Samsung Electronics Co., Ltd
© 2007 Sony United Kingdom Ltd
© 2007 SmarDTV S.A
© 2007 NEOTION SA
86 Draft CI+ Specification V0.8 (2007-12)
1 - issued by the ROT
2 - signed with the private key of the root certificate
3 - one certificate of this type exists for each service operator
4 Each certificate contains a public key for which there is a corresponding private key.
5 Each host and module device shall integrate the following certificate-related information at
6 manufacturing time.
7
• the CI+ root certificate
8 • the brand certificate
9 • the device certificate
10 • the private key corresponding to the device certificate (MDQ or HDQ, see table 5.2)
11 Unlike the other certificates, the service operator certificate is broadcast, it does not have to be
12 integrated at manufacturing time.