ANSI SCTE 201:2018 pdf download.Digital Video Subcommittee.
This document is identical to SCTE 201 2013 except for informative components which may have been updated such as the title page, NOTICE text, headers and footers. No normative changes have been made to this document.
This cryptographic key ladder standard defines a set of key ladder profiles, additional requirements and test vectors for a key ladder implementation.
1.1 Background
This standard is an extension of the ETSI TS 103 162 [1] standard for a key ladder, by further defining certain aspects and providing test vectors to enable implementers to verify certain aspects of an implementation.
The use of a standard key ladder is part of enabling any television receiving device to receive scrambled television content from any television distribution network, independent of the network conditional access security system in use.
However, use of ETSI TS 103 162 [1], described below as Profile 0, is discouraged as it allows use of undisclosed algorithms and therefore undisclosed and unknown intellectual property. This standard specifies certain processes which are both necessary for interoperability and not specified in the ETSI standard.
1.2 Introduction
The key ladder is a standard for enabling and securing the delivery of content descrambling keys from a source device to a sink device. The key ladder derivation is described in this standard, and is a component of a larger system, referred to in this standard as the Open Media Security (OMS).
The basis of the key ladder standard is a three-step key ladder and challenge- response authentication scheme in which the base key derivation inputs are protected within the one-time programmable memory (OTP) of the sink device’s hardware (e.g. chipset). The key ladder is used primarily for the delivery of content descrambling keys while the challenge-response mechanism is used for checking the integrity and authenticity of sink devices as well as messages arriving from a source.
The key ladder standard is designed to support dynamic substitution and replacement of either sink or source device in a manner that maintains the security and integrity of the underlying content distribution network. The standard enables the portability of sink devices between content distribution networks by permitting the field upgradeability of sink devices to work with previously unknown source devices. The standard also enhances the capability of networks to upgrade their source devices without disrupting the capabilities of already fielded sink devices.
The source device is expected to be a key management system such as a traditional CAS or DRM solution deployed by a content distribution network, and the sink device is expected to be a secure content consumption device such as a STB or television, this standard is not limited to only supporting these particular types of devices.ANSI SCTE 201 pdf download.