OnlyKey

OnlyKey is a multi-function hardware security key combining features of a password manager, two-factor authentication (2FA) token, file encryption token, and secure storage device. The device incorporates hardware storage for password and username combinations, while also acting as a portable password manager.
Overview
OnlyKey is notable for its physical keypad, which allows users to enter a PIN code directly on the device. After 10 failed attempts to unlock, all data is erased. When logging in to a configured website or service, besides entering the username and password, the user also physically confirms the login attempt by pressing a button.
* Security and Durability: OnlyKey is open source
Disadvantages
* Cost: Compared to software-based password managers, OnlyKey requires an upfront purchase for the hardware device itself.
* Learning Curve: Setting up and using OnlyKey may require familiarization with its features and functionalities compared to typical password management solutions. Complex setup process compared to security keys like YubiKey.<ref name"Kingsley-Hughes 2021" /><ref name"Loeffler 2023 e619" />
* Physical Loss: Losing the OnlyKey device can potentially lock the user out of their accounts if no backup is created. Unlike other security keys, OnlyKey has a secure backup feature to solve this issue.
* Limited OTP Functionality: The absence of both an on-board clock and non-volatile memory necessitates the OnlyKey App to be running for Time-based One-Time Password (TOTP) generation. Although there are some exceptions when the hardware key is continuously powered.<ref name="Its Chris Approved f015" />
 
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