Module advanced_commitment 

Advanced commitment schemes with opening proofs.

This module provides advanced cryptographic commitment schemes beyond basic commitments:

• Trapdoor commitments: Allow commitment creator to open to different values (with trapdoor)
• Equivocal commitments: Support simulation in zero-knowledge proofs
• Extractable commitments: Enable proof-of-knowledge extraction
• Vector commitments: Commit to vectors with sublinear opening proofs

These advanced schemes are useful for:

• Zero-knowledge proof systems
• Secure multi-party computation
• Verifiable computation
• Blockchain applications

Example - Trapdoor Commitment

use chie_crypto::advanced_commitment::TrapdoorCommitment;

// Setup with trapdoor
let (commitment, trapdoor) = TrapdoorCommitment::setup();

// Commit to a value
let value = b"original value";
let (com, opening) = commitment.commit(value);

// Can open normally
assert!(commitment.verify(&com, value, &opening));

// With trapdoor, can open to different value
let fake_value = b"different value";
let fake_opening = commitment.equivocate(&com, value, &opening, fake_value, &trapdoor);
assert!(commitment.verify(&com, fake_value, &fake_opening));

Structs

ExtractableCom

Extractable commitment value.

ExtractableCommitment

Extractable commitment scheme.

ExtractableOpening

Extractable commitment opening with proof of knowledge.

Trapdoor

Trapdoor key (discrete log of H with respect to G).

TrapdoorCom

Trapdoor commitment value.

TrapdoorCommitment

Trapdoor commitment scheme.

TrapdoorOpening

Opening for a trapdoor commitment.

VectorCom

Vector commitment value.

VectorCommitment

Vector commitment scheme.

VectorOpening

Opening proof for a position in the vector.

Enums

AdvancedCommitmentError

Errors that can occur during advanced commitment operations.

Type Aliases

AdvancedCommitmentResult

Result type for advanced commitment operations.