Cinepedia

The Technology Behind The Big Screen

  • System
    • System Basics
    • DCI & SMPTE
  • Packaging
    • DCP
    • The Composition
    • Title Versions
    • Composition Playlist (CPL)
    • Track Files
    • Track File Encryption
    • Packing List
    • Additional Metadata
    • Interop DCP / SMPTE DCP
  • Security
    • Trust Model
    • Encryption
    • Trusted Device List
    • Digital Certificate
    • KDM
    • Media Block
    • Security Log
  • Picture
    • Picture Introduction
    • Color Distribution & Display
    • Color Gamut
    • Contrast & Dynamic Range
    • Resolution & Aspect Ratio
    • Light
    • Picture Track File & Compression
    • Projector Image Formation
    • Projection Screens
    • Stereoscopic 3D
  • Sound
    • Cinema Sound Basics
    • Sound Formats and Soundfields
    • MainSound Track File
  • Accessibility
    • Accessibility Overview
    • Accessibility & Audio Track File
    • Timed Text Track Files
    • Reel Flexibility for Timed Text
    • Communications for Off-Screen Timed Text
  • FAQs
    • Technology FAQs
    • Business FAQs
    • Accessibility FAQs
  • History
    • Early History
  • Terminology
  • References
  • Interop DCP
  • menuToggle Mobile Menu
  • Back to Top

Digital Cinema Certificate

section-705

Digital Cinema Security
Digital certificates provide a secure and interoperable means for exchange of public keys while proving that the public key is from a trusted entity. The Digital Cinema Certificate is recognized by DCI as a declaration that the certified device meets the DCI Specification. (See DCI DCSS section 9.6.2.2.) A Digital Cinema Certificate, therefore, is a declaration from a trusted party that a particular device is to be trusted.

In cryptography, a digital certificate is typically accompanied by a chain of certificates, tightly linked by digital signature, and ultimately signed by a trusted root certificate. In many business applications, the trusted root certificate is provided by a trusted third party. In digital cinema, the need for a third party is eliminated. The root certificate can be provided by a trusted vendor, such as the manufacturer of a Media Block. Trust in in the vendor is established through the vendor’s relationship with content owners and the knowledge that its products are DCI-compliant, eliminating the need, expense, and complexity of a trusted third party.

In 2011, a change in rules from the US National Institute of Standards and Technology (NIST), the owner of the FIPS 140-2 specification, disallowed the shared use of a single public-private key pair for applications such as TLS, digital signature, and encryption/decryption of AES symmetric keys in the KDM. The result is that new Media Block designs now carry two key pairs, one shared among TLS and digital signature applications, and the other applied only for the protection of AES symmetric keys. For this reason, Media Blocks designed after 2011 have two digital certificates that share public keys.

Digital cinema certificates are a constrained version of the widely used X.509 v3 certificate defined in IETF RFC 5280. The Digital Cinema Certificate uses the following features of the X.509 v3 digital certificate:

  • Version Number
  • Serial Number
  • Signature Algorithm ID
  • Issuer Name
  • Validity Period
  • Subject Name
  • Subject Public Key Info
  • Issuer Unique Identifier
  • KeyUsage Extension
  • BasicConstraint Extension
  • Certificate Signature Algorithm
  • Certificate Signature

The manner in which these elements are applied is defined in SMPTE ST 430-2 Digital Certificate.

last changed 2019-03-11 in Security by MK

→  Key Delivery Message (KDM)
←  Trusted Device List & Workflow

About

About Cinepedia

Interop DCP

The Interop DCP documentation below is provided for those who seek interoperability with older … more

An Early History of Digital Cinema

Public demonstrations of modern day digital cinema began in 1999 ...

copyright © 2016 - 2022 mkpe consulting llc

We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept”, you consent to the use of all cookies.
Cookie settingsACCEPT
Manage consent

Privacy Overview

This website uses cookies to improve your experience while you navigate through the website. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. We also use third-party cookies that help us analyze and understand how you use this website. These cookies will be stored in your browser only with your consent. You also have the option to opt-out of these cookies. But opting out of some of these cookies may affect your browsing experience.
Necessary
Always Enabled
Necessary cookies are absolutely essential for the website to function properly. These cookies ensure basic functionalities and security features of the website, anonymously.
CookieDurationDescription
cookielawinfo-checbox-analytics11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checbox-functional11 monthsThe cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checbox-others11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-necessary11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-performance11 monthsThis cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy11 monthsThe cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.
Functional
Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features.
Performance
Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors.
Analytics
Analytical cookies are used to understand how visitors interact with the website. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc.
Advertisement
Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. These cookies track visitors across websites and collect information to provide customized ads.
Others
Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet.
SAVE & ACCEPT
Powered by CookieYes Logo