What are the key size and IV value for the lightweight symmetric stream cipher Trivum?

Trivium is a well-known lightweight symmetric stream cipher designed for efficient performance in resource-constrained environments, such as embedded systems. The fundamental characteristics of Trivium include its key size and initialization vector (IV) size, both of which are set to 80 bits.

The choice of an 80-bit key and 80-bit IV provides a balance between security and performance. This size is generally deemed sufficient to ensure security against many types of attacks while being optimized for environments where computational resources are limited. The 80-bit length is commonly used in various lightweight cryptographic applications, making it a practical choice for the intended use cases of Trivium.

Given this understanding, the selection of the answer stating 80-bit key and 80-bit IV accurately reflects the specifications of the Trivium stream cipher.