HID Protocol
HID Protocol (Human Interface Device) is a USB standard that hardware wallets use to securely communicate with computers, mimicking input devices for driverless transaction signing in cryptocurrency.
What Is a HID Protocol?
A HID Protocol is a USB standard known as Human Interface Device. Hardware wallets use it to communicate securely with computers. It mimics everyday input devices like keyboards or mice. This allows driverless operation for signing cryptocurrency transactions.
Hardware wallets connect via USB and enumerate as HID devices. Computers recognize them without custom drivers. The wallet receives transaction data through HID report descriptors. It processes the data internally on its secure chip. The signed transaction returns as simulated keystrokes or mouse events. For example, Trezor wallets use HID to send a signed transaction hash as a keyboard input sequence.
HID Protocol matters in cryptocurrency for its security benefits. It avoids installing potentially vulnerable drivers. This reduces the attack surface on the host computer. Users verify transactions on the wallet's screen before signing. The protocol supports air-gapped setups, keeping private keys offline.
Key characteristics include universality across operating systems, low-level USB encapsulation for data exchange, and feature reports for bidirectional communication. Synonyms are Human Interface Device and USB HID. It prioritizes simplicity and security over high-speed data transfer.
Cryptocurrency is a digital or virtual currency secured by cryptography, operating on decentralized blockchain networks to enable secure, peer-to-peer transactions.
Read full definitionTrezor is a hardware wallet by SatoshiLabs. It stores private keys offline to secure cryptocurrencies.
Read full definitionIn cryptocurrency, a swap is the direct exchange of one token for another on a blockchain, often via decentralized exchanges (DEXs) without intermediaries.
Read full definitionReal-World Examples
Example 1: Trezor Wallet Transaction Signing
- Connect Trezor One to your computer via USB.
- The computer detects it as a HID keyboard, no drivers needed.
- Wallet software sends unsigned Bitcoin transaction data via HID reports.
- User verifies details on Trezor's screen, confirms signing.
- Trezor returns the signed transaction as simulated keystrokes to the software.
Example 2: Ledger Nano S Ethereum Transfer
- Plug Ledger Nano S into USB port.
- It enumerates as HID device across Windows, macOS, Linux.
- Ledger Live sends Ethereum transfer details through HID feature reports.
- Device processes on secure element, displays for user approval.
- Signed data returns via HID input reports, mimicking mouse clicks.
Example 3: Air-Gapped Signing with HID
- Prepare transaction on online computer, export unsigned data.
- Transfer data to air-gapped machine via QR code.
- Connect hardware wallet (e.g., KeepKey) as HID device.
- Send data via HID, sign offline, return signed tx as keystrokes.
- Import back to online machine without exposing keys.
Trezor is a hardware wallet by SatoshiLabs. It stores private keys offline to secure cryptocurrencies.
Read full definitionBitcoin (BTC) is the first decentralized cryptocurrency, launched in 2009. It uses blockchain technology for secure, peer-to-peer digital transactions without intermediaries.
Read full definitionLedger is a brand of hardware wallets that securely store cryptocurrency private keys offline, such as the Ledger Nano series.
Read full definitionEthereum is a decentralized blockchain platform that enables smart contracts and decentralized applications (dApps). Its native cryptocurrency is Ether (ETH).
Read full definitionLedger Live is a software application that manages cryptocurrency assets and interacts with Ledger hardware wallets for secure transactions and portfolio management.
Read full definitionOffline Signing refers to signing cryptocurrency transactions on a device that is not connected to the internet, ensuring private keys remain secure from online threats.
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