PeerId

As explained in Rust Servers, Services, and Apps

A peer ID is a unique cryptographic identifier assigned to a node in a peer-to-peer network.

use libp2p::{identity, PeerId};                             #1
 
#[tokio::main]                                              #2
async fn main() {                                           #3
    let new_key = identity::Keypair::generate_ed25519();    #4
    let new_peer_id = PeerId::from(new_key.public());       #5
    println!("New peer id: {:?}", new_peer_id);
}

How Rust Servers, Services, and Apps covers it

How deep it goes

Defines PeerId generation from a public key and demonstrates it in Rust, while deferring other cryptographic uses.

Examples

Shows ED25519-based PeerId generation in Rust and a complete multiaddress containing a PeerId.

What it assumes

Builds from basic public- and private-key roles, explaining their use in peer identity.

What you can do after

Apply libp2p to generate a PeerId from a key pair’s public key and recognize it in a multiaddress.

How it connects

Connects peer identity to public-key cryptography, key pairs, libp2p, and multiaddresses.

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Related concepts

• public keyuses · A public key is the openly distributable component of an asymmetric cryptographic key pair, used for encryption, authentication, or signature verification.
• multiaddresspart of · A multiaddress is a self-describing network address format that can encode the protocols and endpoint information needed to reach a network node.
• cryptographic hashkind of · A cryptographic hash is a fixed-length digest computed from input data by a deterministic function designed to resist preimage, second-preimage, and collision attacks.
• peer-to-peer networkequivalent to · A peer-to-peer network is a distributed architecture in which equivalent participants communicate and exchange resources directly without a central intermediary.
• authenticated channelproduces · An authenticated channel is a communication path that provides assurance of the communicating parties' identities and the integrity and authenticity of transmitted information.

This explainer was generated by Manning's knowledge graph from the text of Rust Servers, Services, and Apps. The section links point to the parts of the book it draws on.