Definition
Keyloggers can be software or physical devices that capture keyboard input. Some monitoring tools have authorized uses, but covert deployment for credential theft is malicious. In crypto, typing a private key, recovery phrase or exchange password on a monitored device can disclose it. The threat concerns the input environment rather than a weakness in the blockchain’s signature mathematics.
How It Works
Captured input may be stored or transmitted to another party. A keylogger can be part of broader spyware that also reads clipboard contents or takes screenshots, although those capabilities are distinct from keystroke logging itself. Consequently, switching to copy-and-paste or an on-screen keyboard is not a universal defense against a compromised device. A hidden program may continue running even when no obvious window is visible.
Key Considerations
Avoid entering wallet recovery secrets into untrusted computers and use verified software distribution channels. Hardware signing can keep some secrets away from the host keyboard, but users must still verify what they approve. If monitoring is suspected, secure accounts from a known-clean device and assess whether signing secrets were exposed. Changing a password on the same infected computer may reveal the replacement too. Removing malware does not revoke credentials or keys that have already been copied.