Two-factor authentication with a simple touch of a button

https://www.yubico.com/products/yubikey-hardware/
A YubiKey is a small hardware device that offers two-factor authentication with a simple touch of a button. YubiKeys are built strong enough for the largest enterprises, while remaining simple enough for anyone to use. The YubiKey NEO offers both contact (USB) and contactless (NFC, MIFARE) communications.

Shodan- Search engine for Internet-connected devices.

https://www.shodan.io/