Yubico makes a couple products that might fit your requirements. The YubiHSM [1] ($500) is a USB HSM designed to be connected to server. Yubikey Neo [2] ($50) i

Yubico makes a couple products that might fit your requirements. The YubiHSM [1] ($500) is a USB HSM designed to be connected to server. Yubikey Neo [2] ($50) is does end-user authentication (OTP, CCID, SE, JavaCard) over NFC or USB. They can both be ordered in quantities of one and have open source SDKs [3]. [1]: http://www.yubico.com/products/yubihsm/ http://www.yubico.com/products/yubihsm/ [2]: http://www.yubico.com/products/yubikey-hardware/yubikey-neo/ http://www.yubico.com/products/yubikey-hardware/yubikey-neo/ [3]: http://www.yubico.com/develop/open-source-software/ http://www.yubico.com/develop/open-source-software/