Broadcast Payload Data Protection with Receiver-Specific Keys
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Solution Overview
Problem
Current broadcast communication systems face challenges in securely transmitting payload data to a large number of consumers, as existing cryptographic key distribution methods are cumbersome to replace and cannot identify compromised recipients, leading to security breaches.
Innovation Solution
A two-step cryptographic approach is employed, where a public key set is generated on a server, and individual receiver device keys are distributed, enabling each device to generate a receiver key using a received envelope, allowing for easy key replacement by distributing only the envelope over a one-to-many communication channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cryptographic key pair is established for broadcast communication security, then data transmission security is improved, but key replacement effort increases greatly when keys are compromised
Solution Approach 1:
The cryptographic system is segmented into multiple independent key pairs, each assigned to a specific recipient. Instead of using a single shared key pair for all recipients, each recipient has their own key pair (public key PKi and private key SKi). This segmentation allows individual key compromise to be isolated to a single recipient without affecting the security or requiring replacement of keys for other recipients.
Solution Approach 2:
The system changes the parameter of key distribution from a single shared key pair to multiple individual key pairs. By changing this fundamental parameter, the system enables selective key management where compromised keys can be individually replaced without system-wide key rotation, significantly reducing key replacement effort while maintaining security.
2Reliability
If the same cryptographic key is distributed to all recipients, then communication security is established, but the ability to identify compromised recipients is lost
Solution Approach 1:
The system segments the cryptographic keys by assigning unique key pairs to each recipient. Each recipient i has their own public key PKi and private key SKi. This segmentation enables the sender to identify which specific recipient's key may be compromised by monitoring which recipient can successfully decrypt messages, thereby solving the identification problem while maintaining security.
Solution Approach 2:
The system implements feedback mechanisms where the sender can determine which recipients have successfully received and can process encrypted messages. By observing which recipients can decrypt messages using their private keys, the system gains feedback information that helps identify potentially compromised keys, allowing for targeted security responses.
3Reliability
If cryptographic keys are frequently updated to maintain security, then security reliability is improved, but data transmission efficiency decreases due to low available data rates
Solution Approach 1:
The system implements dynamic key management where key updates are performed on-demand based on security requirements rather than following a rigid frequent update schedule. The segmented key structure allows the system to adaptively update only the necessary keys when security events occur, optimizing the balance between security reliability and transmission efficiency in low-bandwidth environments.
Solution Approach 2:
The system changes the key update frequency parameter from fixed and frequent to variable and event-driven. By using individual key pairs for each recipient, the system can maintain high security reliability while updating keys only when necessary, thereby avoiding the continuous transmission overhead that would degrade data transmission efficiency in low-bandwidth scenarios.
4Difficulty of detecting and measuring
If individual receiver device keys are distributed to each device, then key compromise identification is enabled, but key distribution complexity increases
Solution Approach 1:
The sender device is designed with universal functionality to generate and manage multiple recipient-specific key pairs. The sender can universally apply the same cryptographic algorithm to generate different key pairs for different recipients, and can universally encrypt messages for any recipient using their public key. This multi-functionality enables individual key distribution while keeping the overall system manageable through standardized procedures.
Data Source
AI summary
In a method for protecting payload data transmitted via a one-to-many communication channel from a provider device to at least one receiver device a public key set (PK) supporting asymmetric bilinear pairings is generated. A number of receiver device keys (DKi) that are generated based on the public key set (PK) are distributed to respective devices including the at least one receiver device. A provider key (K) is generated based on the public key set (PK) and inter alia on an encryption random number (t) and stored in the provider device. An envelope (ENV) is generated based on the public key set (PK) and on the encryption random number (t) and is distributed, via the one-to-many communication channel, to the respective devices including the at least one receiver device. The at least one receiver device generates a receiver key, which corresponds to the provider key, based on the distributed envelope (ENV) and the distributed receiver device key (DKi). The provider device encrypts and/or signs the payload data employing the provider key (K) for producing protected payload data and distributes them via the one-to-many communication channel to the respective devices. The at least one receiver device processes, e.g. by decrypting and/or authenticating, the protected payload data employing the receiver key.