Appendix J: Glossary of Terms

Datacryptor Ethernet User Manual

Appendix J: Glossary of Terms

Advanced Encryption Standard (AES)

Bits per Sec (bps)

Block cipher

Certificate

Certification Authority (CA)

Cipher block chaining (CBC)

Ciphertext

Ciphertext Stealing (CTS)

Command Line Interface (CLI)

Diffie-Hellman

Digital Signature

Digital Signature

Standard (DSS)

DSA

DSA public parameters

A symmetric algorithm (same key for encryption and decryption) using block encryption of 128 bits in size, supporting key sizes of 128, 192 and 256 bits.

The number of bits passing a point every second; the transmission rate for digital information.

A type of symmetric (secret-key) encryption algorithm that encrypts a fixed length block of plaintext at a time. With a block cipher, the same plaintext block always encrypts to the same ciphertext block, under the same key.

A digital document which helps to prevent someone impersonating someone else. Each certificate contains a certified public key and other information such as issuer’s name and algorithms used in encryption and decryption.

A certificate authority is a trusted organization that accepts certificate applications, authenticates applications, issues certificates, and maintains status information about certificates.

A method of using a block cipher in which two identical plaintext blocks encrypt to different ciphertexts.

An unintelligible form of data that can only be read if specific operations are performed on it using a key and decrypting algorithm.

CTS mode is a Datacryptor mode of operation that minimizes the latency caused by the encryption of the Ethernet packets passing through the Datacryptor unit.

The CLI is the text-based user interface to the Datacryptor.

A protocol which allows two users to agree a secret key over an insecure medium without any prior secret keys.

A digital signature must be difficult to repudiate, and must protect the integrity of the information being signed. By encrypting a digest of a message with the private key, authentication can later be performed by applying the public key to an encrypted digest (digital signature) and comparing the result to the digest of the message.

A standard for digital signatures using the DSA public key algorithm and the SHA-1 hash algorithm.

An abbreviation for Digital Signature Algorithm. It is an algorithm used for authentication only.

Parameters used to generate and check DSA digital signatures.

Page 132

THALES

Page 132
Image 132
Angenieux 1270A450-005 user manual Appendix J Glossary of Terms, DSA public parameters

1270A450-005 specifications

The Angenieux 1270A450-005 is a notable piece of optical engineering, specifically designed for high-performance applications in cinema and broadcast productions. Renowned for its exceptional optical quality and versatility, this lens has secured its place as a preferred choice among professionals in the film industry.

At its core, the Angenieux 1270A450-005 boasts a remarkable focal length of 12-70mm, allowing users to seamlessly transition between wide-angle shots and tighter compositions without the need to change lenses frequently. This feature significantly enhances shooting efficiency, making it ideal for dynamic environments where time is of the essence. The lens also offers a fast maximum aperture of T2.8, ensuring bright and vibrant imagery under various lighting conditions and allowing for impressive depth of field control.

One of the defining characteristics of the Angenieux 1270A450-005 is its innovative optical design, which minimizes chromatic aberrations and provides consistent sharpness across the entire zoom range. The lens features advanced glass elements that are meticulously crafted to optimize clarity and contrast, delivering stunning images even in challenging conditions. This is especially beneficial in high-resolution formats, where every detail is crucial.

The lens is compatible with a variety of camera systems, making it a versatile tool for cinematographers who may work with different setups. Its robust construction further underscores Angenieux's commitment to durability; the lens is designed to withstand the rigors of on-location shooting while maintaining its optical integrity.

In addition to its optical features, the Angenieux 1270A450-005 incorporates modern technologies such as an accurate and smooth zoom mechanism, allowing for precise adjustments during shooting. The focus ring offers excellent tactile feedback, making it easier for operators to achieve shallow depth of field effects or to track subjects in motion effortlessly.

Overall, the Angenieux 1270A450-005 combines superior optical quality, versatility in focal length, and a robust build to cater to the needs of professional filmmakers. Its ability to deliver breathtaking visuals across a range of shooting scenarios solidifies its status as a valuable asset in any cinematographer's toolkit. With its blend of advanced technologies and user-centric design, the Angenieux 1270A450-005 is a lens that continues to inspire creativity and excellence in visual storytelling.