One-Shot Signatures

OSS (One-Shot Signatures) represents a revolutionary post-quantum cryptographic paradigm where quantum secret keys are designed for single-use applications.

Once used to sign a message, the quantum key is automatically destroyed, providing unprecedented security guarantees against quantum attacks and preventing key reuse or duplication.

Read the technical paper

One-Shot Signature Architecture

One-shot signatures leverage quantum mechanics principles to create cryptographic keys that self-destruct after a single use, making forgery and key reuse physically impossible through the no-cloning theorem.

Quantum Key Generation: Generates ephemeral quantum signing keys |sk⟩ paired with classical public verification keys
Post-Quantum Resistant: Designed to remain secure against both classical and quantum adversaries
Single-Use Security: Quantum state collapse ensures keys cannot be copied or reused after signing
Hybrid Cryptography: Enables classical devices to leverage quantum servers without full quantum adoption

Protocol Components

Key Generation: The quantum signer generates an ephemeral quantum signing key |sk⟩ and a classical public verification key pk accessible to verifiers.
Signing: The quantum key |sk⟩ signs a message m, producing a classical signature σ. The quantum key is automatically destroyed upon use.
Verification: Anyone with the public key pk can verify the signature σ on message m, guaranteeing authenticity while preserving one-shot security.

Why OSS?

Quantum-Proof Security

Leverages fundamental quantum mechanics principles to provide security guarantees that remain valid even against quantum adversaries with unlimited computational power.

Prevents Key Reuse Attacks

Automatic key destruction after use eliminates risks associated with key reuse, replay attacks, and double-spending in digital transaction systems.

Future-Ready Architecture

Designed for the quantum computing era while maintaining compatibility with existing classical infrastructure and communication channels.

Key Applications

Signature Delegation: Allows secure delegation of signing authority for exactly one message, preventing unauthorized multiple signatures while maintaining quantum security guarantees.
Financial Services: Instant verification across banking systems, replacing multi-day settlements in $150T payment market and saving billions in costs.
Software Security: Preventing SolarWinds-style attacks, protecting against $100B+ breaches without trusting certificate authorities.
Regulatory Compliance: Indestructible signature to satisfy all regulators (SEC, FDA, EPA), now and future.

Technical Implementation

Current Challenges

Secure one-shot chameleon hash construction
Non-collapsing hash function requirements
Quantum obfuscation for implementation protection
Common Reference String (CRS) model limitations

Research Areas

Post-quantum signature scheme integration
Hybrid quantum-classical protocol design
Efficient delegation mechanisms
Decentralized consensus without blockchains

Real-World Applications

Application	Description	Security Benefit
Digital Identity	Secure authentication with automatic key expiration	Prevents credential theft and reuse
Financial Transactions	Single-use payment authorization preventing double-spending	Quantum-resistant transaction security
Smart Contracts	Self-executing contracts with quantum-secured single operations	Immutable execution guarantees
Secure Communications	Message authentication with forward secrecy	Perfect forward secrecy through key destruction
Decentralized Finance	Quantum-secure DeFi operations without traditional consensus	Eliminates 51% attacks and consensus manipulation
Digital Rights Management	Single-use content access with quantum protection	Prevents unauthorized copying and distribution

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