Securing Recordings - Avaya XT Series Deployment Manual

Securing your XT Series
Field Name
Default Lecturer
Layout
3. From the web interface only, select Save.

Securing Recordings

You can secure recordings by adding a digital signature to the recording.
A digital signature is a mathematical scheme for demonstrating the authenticity of data. A valid
digital signature gives a recipient reason to believe that the data was created by a known entity
(authentication), that the entity cannot deny having signed the data (non-repudiation), and that the
data was not altered (integrity).
A digital signature is the digital equivalent of a handwritten signature or stamped seal, but offering
far more inherent security. A digital signature is commonly used when it is important to detect
forgery or tampering. As an electronic analogue of a written signature, a digital signature provides
assurance that:
• the claimed signatory has signed the information.
• the information was not modified after signature generation.
Digital signatures are based on public key cryptography, also known as asymmetric cryptography.
CAdES (CMS Advanced Electronic Signatures) is a set of extensions to Cryptographic Message
Syntax (CMS) signed data making it suitable for advanced electronic signatures. CAdES files have
p7m extension and can be validated using publicly available software.
To add a digital signature for an USB recorded video, the XT Series creates a one-way hash of the
mp4 file (using SHA256). The value of the hash is unique to the recorded video. Any change in the
data, even changing or deleting a single video frame, results in a different hash value.
This hash is then signed with a customer loaded digital signature (or a default one generated by
the XT Series) and the resulting signed hash (along with other information about the signer's and
root CA certificate) is stored as a p7m file in the USB storage, together with the recorded video.
When the recorded mp4 file is validated by the XT Series, the XT Series is able to detect if the
recorded video hash corresponds to the digital signed data contained in the associated p7m file,
and also to display information about the signing entity. The p7m file can also be used by a third
party to validate the recorded file signature (for instance using online p7m validators).
August 2020
Description
Specify the default layout when hosting a meeting in lecturer mode.
• Select 1 terminal to enable enhanced lecture mode. In enhanced
lecture mode, the XT Series hosting the meeting sends the local
participant video as the lecturer, while the lecturer can see the
Continuous Presence (CP) of other participants. This is the default
behavior.
• Select 2 terminals — A to send everyone, including the lecturer, the
lecturer video as a large display and the video of the previous/active
speaker as a small display.
Deployment Guide for Avaya XT Series
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