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<blockquote data-quote="PowerFind" data-source="post: 339788" data-attributes="member: 21723">AW: H5360BD - HDMI &quot;kein Signal&quot;Mit welchem Medium ging es (Blu-Ray) ?Info: Key-Revocation&nbsp; &nbsp;&nbsp; Key-revocation&nbsp; &nbsp; &nbsp; procedures are there to ensure that any device which violates the license agreement&nbsp; &nbsp; &nbsp; could be relatively easily blocked from receiving HD data. &nbsp; &nbsp;&nbsp; If some particular model is considered&nbsp; &nbsp; &nbsp; 'compromised', its Key Selection Vector (KSV) is put&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; into a blacklist - referred to as revocation list. These lists are&nbsp; &nbsp; &nbsp; encoded onto the HD media e.g. on newly produced disks with HD&nbsp; &nbsp; &nbsp; content. This means that the newer the media - e.g. high definition DVD disc - the larger&nbsp; &nbsp; &nbsp; will be the revocation list.&nbsp; &nbsp;&nbsp; Each revocation list is signed with a digital signature&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; using the&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; Digital Signature Algorithm - also referred to as DSA. DSA is a United&nbsp; &nbsp; &nbsp; States Federal Government standard for digital signatures; it is used to prevent malicious users from&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; both revoking legitimate devices as well as removing revocation for&nbsp; &nbsp; &nbsp; compromised devices from the list.&nbsp; &nbsp;&nbsp; During the authentication process, if the&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; receiver's KSV is found by a transmitter in the revocation list, then&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; the transmitter considers the receiver to be compromised and refuses to&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; send High Definition data to it.&nbsp; &nbsp;&nbsp; It is this key revocation process&nbsp; &nbsp; &nbsp; that makes HDCP sort of 'future-proof' when it comes to combating the use of&nbsp; &nbsp; &nbsp; fake or rogue devices. Through key revocation, HDCP gives the media,&nbsp; &nbsp; &nbsp; content, or even other devices, the ability to invalidate keys of devices&nbsp; &nbsp; &nbsp; known to be a problem. </blockquote>

[QUOTE="PowerFind, post: 339788, member: 21723"] [b]AW: H5360BD - HDMI "kein Signal"[/b] Mit welchem Medium ging es (Blu-Ray) ? [B]Info:[/B][FONT=Arial][COLOR=#000080] Key-Revocation[/COLOR][/FONT] [FONT=Verdana][SIZE=2][B]Key-revocation[/B] procedures are there to ensure that any device which violates the license agreement could be relatively easily blocked from receiving HD data. [/SIZE][/FONT] [FONT=Verdana][SIZE=2]If some particular model is considered 'compromised', its Key Selection Vector (KSV) is put into a blacklist - referred to as revocation list. These lists are encoded onto the HD media e.g. on newly produced disks with HD content. This means that the newer the media - e.g. high definition DVD disc - the larger will be the revocation list.[/SIZE][/FONT] [FONT=Verdana][SIZE=2]Each revocation list is signed with a digital signature using the Digital Signature Algorithm - also referred to as DSA. DSA is a United States Federal Government standard for digital signatures; it is used to prevent malicious users from both revoking legitimate devices as well as removing revocation for compromised devices from the list.[/SIZE][/FONT] [FONT=Verdana][SIZE=2]During the authentication process, if the receiver's KSV is found by a transmitter in the revocation list, then the transmitter considers the receiver to be compromised and refuses to send High Definition data to it.[/SIZE][/FONT] [FONT=Verdana][SIZE=2]It is this key revocation process that makes HDCP sort of 'future-proof' when it comes to combating the use of fake or rogue devices. Through key revocation, HDCP gives the media, content, or even other devices, the ability to invalidate keys of devices known to be a problem. [/SIZE][/FONT] [FONT=Verdana][SIZE=2] [/SIZE][/FONT] [/QUOTE]

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