Introduction To PBFT Consensus Algorithm Training Ppt

Slide 1

This slide contains information regarding the pBFT Blockchain Consensus Mechanism. It also contains details of the blockchains that use pBFT, such as Hyperledger Fabric and Zilliqa. Further, it covers details of Byzantine Generals’ Problem from which the consensus algorithm is derived.

Slide 2

This slide depicts the working of the pBFT consensus algorithm covering details such as leader and backup nodes, and consensus rounds known as views, etc.

Slide 3

This slide lists the multiple advantages and disadvantages of the pBFT consensus mechanism. The benefits of the pBFT algorithm are transaction finality, energy efficiency, and low reward variance. Also, the limitations of pBFT are scaling and susceptibility to Sybil attacks.

Instructor’s Notes:

The major advantages of the pBFT consensus mechanism are as follows:

• Transaction Finality: The transactions can be agreed upon and finalized without multiple confirmations, so there is no waiting period to ensure transaction surety after including it in a block
• Energy Efficiency: pBFT can achieve network consensus without requiring energy-intensive computations
• Low Reward Variance: Every node in the pBFT can be incentivized to lower reward variance for miners since it requires a collective decision via voting on records by signing messages to reach a network consensus

The major disadvantages from which the pBFT consensus mechanism suffers are as follows:

• Scaling: pBFT is ideal for the small number of nodes but becomes inefficient for large networks as each node must talk to every other node to keep the network secure
• Sybil Attacks: The pBFT is susceptible to Sybil attacks, where a single party creates or manipulates many nodes and compromises network security