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As digital and physical security perimeters converge, the need for unified authentication devices has grown. This paper introduces the conceptual Switch Army Knife —a hardware key fob that combines the mechanical utility of a Swiss Army knife with the cryptographic functions of a hardware security key (e.g., FIDO2, YubiKey). We explore the design principles, security challenges, and practical applications of embedding multiple digital credentials (SSH, WebAuthn, TOTP) into a compact, switchblade-like chassis. Because these keys live on your keyring, they get abused

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