> For the complete documentation index, see [llms.txt](https://docs.theradius.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.theradius.xyz/overview/secure-block-building-sbb/core-components.md). # Core Components **Secure-RPC** The Secure-RPC is responsible for creating the initial state of transaction blindness necessary for the ordering mechanism. * **Encryption**: Encrypts transactions using the public key from DKG before they are sent to any external system (e.g., a Tx\_Orderer) * **Key Management**: Manages the communication and retrieval of encryption keys from DKG. This ensures sensitive transaction data is protected both in transit and at rest, guaranteeing data integrity during the ordering phase. * Secure-RPC is designed to be operated by the RPC provider. * All necessary code will be provided by Radius to support integration. * The component is fully dockerized. *** ### **Tx\_Orderer (Operators)** Tx\_Orderer is a node within Radius AVS (Actively Validated Services), responsible for deterministic transaction ordering. The Tx\_Orderer is protocol-constrained to only order encrypted data, fundamentally removing the technical ability to front-run or exploit transactions. * Multiple Tx\_Orderers operate as a cluster to guarantee system fault tolerance and availability. For each block, one Tx\_Orderer is selected from the cluster as the leader, while others serve as verifiers. * Tx\_Orderers are run by independent operators and receive rewards directly from the rollup via restaking protocol integration (e.g., Symbiotic, EigenLayer), ensuring economic alignment. Rollups may choose to run the Tx\_Orderer directly. * The component is fully dockerized.

A monitoring tool for operators

*** ### **Distributed Key Generator (DKG)** The Distributed Key Generator (DKG) is a critical protocol component responsible for provisioning cryptographic keys for a secure, time-locked encryption/decryption mechanism. This mechanism is formalized via Single Key Delay Encryption (SKDE). Learn more about DKG in the [next section](/overview/secure-block-building-sbb/distributed-key-generator-dkg.md).