The problem zk2fa solves

The zk-2FA (Zero-Knowledge 2-Factor Authentication) is an innovative smart contract solution designed to integrate the robust security features of Google Authenticator into blockchain technology. It aims to bolster security and privacy in blockchain-based transactions and interactions.

Here's a breakdown of its functionalities and benefits:

Google Authenticator Integration: zk-2FA leverages the security mechanisms of Google Authenticator, a widely-used app for implementing two-factor authentication (2FA). This integration ensures an additional layer of security beyond traditional passwords.

Smart Contract Implementation: By utilizing smart contracts, zk-2FA enables the execution of predefined authentication protocols on the blockchain. These contracts can manage the authentication process, ensuring that only authorized users gain access to certain functionalities or transactions.

Privacy Enhancement: Zero-knowledge proofs (zk-proofs) are likely utilized within zk-2FA. These cryptographic techniques allow a user to prove possession of certain information (like a valid authentication token) without revealing the underlying data itself. This ensures privacy while still confirming authentication.

On-Chain Verification: zk-2FA allows verification of authentication on the blockchain. This means that the validation of user identity and access rights can be confirmed directly on the blockchain, adding a layer of trust and transparency to the process.

Security Enhancement: By combining the robustness of Google Authenticator with the immutability and transparency of blockchain technology, zk-2FA aims to significantly enhance the security posture of transactions and interactions within blockchain ecosystems.

Proof of Authentication: Users can provide cryptographic proofs of authentication on the blockchain. These proofs serve as evidence that the user has successfully passed the authentication process without revealing sensitive information.

Challenges I ran into

Complexity of Implementation: Integrating zero-knowledge proofs (zk-proofs) and Google Authenticator into smart contracts is complex. It requires expertise in cryptography, smart contract development, and blockchain technology. Ensuring that these systems work seamlessly together without compromising security is a significant challenge.

Scalability: Zero-knowledge proofs often require significant computational resources. As the number of transactions increases, scalability becomes a concern. Ensuring that the authentication process remains efficient and doesn’t bottleneck the blockchain network is crucial