## Core Principles
FIDO devices adhere to the following core principles:
1. **Passwordless Authentication:** Eliminates traditional passwords through cryptographic key pairs.
2. **Strong Security:** Uses public key cryptography for authentication.
3. **Privacy-Centric:** Ensures no personal information is shared with servers.
4. **Phishing Resistance:** Authentication happens locally on the device and is not vulnerable to phishing attacks.

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## Types of FIDO Devices
FIDO devices generally fall into two categories:

### 1. **FIDO U2F Devices** (Universal 2nd Factor)
– Acts as a second factor alongside traditional passwords.
– Example: USB Security Keys.

### 2. **FIDO2 Devices**
– Supports passwordless authentication via public key cryptography.
– Enables **WebAuthn** and **CTAP (Client-to-Authenticator Protocol)**.
– Examples:
– USB Security Keys
– Biometric Devices (e.g., fingerprint readers)
– Smartphones as authenticators

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## How FIDO Devices Work
1. **Registration**
– A user registers their FIDO device with a service.
– The device generates a unique key pair (public and private keys).
– The public key is sent to the service, and the private key remains securely on the device.

2. **Authentication**
– When a user logs in, the service sends a challenge.
– The FIDO device signs the challenge with the private key.
– The service verifies the signature using the public key, granting access.

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## Examples of FIDO Devices
– **YubiKey** (by Yubico)
– **Google Titan Security Key**
– **SoloKeys**
– Built-in biometric devices (e.g., Windows Hello or Touch ID)

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## Benefits of FIDO Devices
1. **Enhanced Security:** Strong cryptographic keys protect against phishing and password theft.
2. **Ease of Use:** Simplifies login processes with a single tap or biometric confirmation.
3. **Privacy Protection:** Authentication is performed locally, so no personal data is shared.
4. **Cross-Platform Support:** Compatible with major platforms and browsers.

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## Use Cases
FIDO devices are widely used in:
– Online Banking
– Enterprise Single Sign-On (SSO)
– Government Authentication Systems
– Secure Cloud Services
– Personal and Business Account Protection

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## External Resources
– [FIDO Alliance Official Website](https://fidoalliance.org/)
– [WebAuthn Explained – MDN Docs](https://developer.mozilla.org/en-US/docs/Web/API/Web_Authentication_API)

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## Internal Links
– [[Quantum-Resistant Security]]
– [[2.4.2 Vecton 4096-Bit Encryption]]
– [[2.7 Cryptocase – Revolutionizing Secure Wallet Solutions]]