Optical Transceiver Cryptographic Authentication
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Solution Overview
Problem
The authenticity of optical transceivers used in optical networking devices is difficult to validate, leading to the potential use of inferior or counterfeit transceivers that can compromise the operation of these devices.
Innovation Solution
A cryptographic authentication scheme is implemented between the optical transceiver and the host system, using complementary encryption and decryption keys to verify the authenticity of the transceiver by encrypting and decrypting a random data string, ensuring only authorized transceivers are recognized and used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cryptographic authentication scheme is implemented, then reliability of transceiver validation is improved, but device complexity increases
Solution Approach 1:
The cryptographic keys are pre-loaded into the transceiver and host system during manufacturing, before the authentication process occurs. This preliminary action ensures that the authentication mechanism is already in place and functional, improving reliability without requiring complex runtime key distribution or generation systems.
Solution Approach 2:
The patent uses a data string that is copied from the host system to the transceiver, encrypted by the transceiver, and then compared back. This copying approach simplifies the authentication process by using simple data replication and transformation rather than complex challenge-response protocols or multiple cryptographic operations.
2Object-affected harmful factors
If cryptographic authentication is performed, then security against counterfeit devices is improved, but ease of operation deteriorates
Solution Approach 1:
The transceiver performs the encryption operation itself using its pre-loaded key, and the host system performs the decryption and comparison. This self-service approach distributes the cryptographic workload automatically between the two components, providing strong security without requiring manual configuration or user intervention during installation.
Solution Approach 2:
All cryptographic key setup and configuration is performed in advance during manufacturing, before the transceiver is installed in the host system. This preliminary configuration eliminates the need for users to perform complex security setup procedures, maintaining ease of operation while ensuring security.
Data Source
AI summary
An optical transceiver module is authenticated in a host system. A host generates a data string and writes the data string to a first predetermined memory location known to the transceiver. The data string is cryptographically altered (either encrypted or decrypted) by the transceiver and written to a second predetermined memory location known to the host. The host retrieves the cryptographically altered data string and performs a complementary cryptographic operation (either a decryption or encryption, respectively) thereon, creating a resulting data string. If the resulting data string is equal to the data string written to the first predetermined memory location, the transceiver is authenticated. The host and the transceiver may switch roles, with the transceiver generating the data string, the host cryptographically altering it, and so on. The host encrypts data strings when the transceiver decrypts data strings, and vice versa.