Feitian C100 I34

Feitian C100 I34 – The OATH-compliant HOTP Hardware Token in a modern I34 enclosure for event-based, time-independent one-time password authentication

The Feitian C100 I34 is a compact Hardware Token for event-based one-time password (HOTP) authentication. Unlike time-based TOTP tokens, the C100 I34 generates a new 6-digit code not at fixed time intervals, but each time the button is pressed—the generated code remains valid until the button is pressed again. This makes it particularly suitable for environments where users need more time to enter the code or where strict time synchronization cannot be guaranteed. The modern I34 housing features an enlarged display, an integrated battery indicator, and high durability for everyday use.

HOTP at the Push of a Button: Flexible, Timeless, and Reliable

The C100 I34 is based on the OATH-HOTP standard (HMAC-SHA1) and generates a new, unique one-time code with every keystroke. Unlike TOTP tokens, there is no countdown—the code remains valid until the next one is generated. This offers users greater convenience when entering the code and makes the token independent of precise time synchronization between the token and the authentication server. No software installation is required on the end device.

Durable, waterproof, and suitable for everyday use

The C100 I34 is IP67-certified—dust- and water-resistant—and designed for everyday Enterprise Deployment. The tamper-resistant, keychain-sized housing offers optimal protection. Under normal conditions, the battery lasts up to 5 years. Weight: 14 g.

The right choice for specific applications such as Cisco Duo and WebUntis

The C100 I34 is the top choice for authentication platforms that explicitly require HOTP—particularly Cisco Duo and WebUntis. Important note: Microsoft Azure MFA, Microsoft Entra ID, and Microsoft 365 are not compatible with HOTP tokens—for these services, we recommend the C200 I34 (TOTP).

Compatible Services and Platforms

Compatible with Cisco Duo, WebUntis, the Feitian OTP Authentication Server (FOAS), and other OATH-HOTP-compliant authentication servers. Not compatible with Microsoft Azure MFA / Microsoft Entra ID / Microsoft 365—these platforms require TOTP.

Who is the Feitian C100 I34 suitable for?

Companies, schools, and government agencies that use authentication platforms with HOTP requirements—particularly Cisco Duo or WebUntis—and want to rely on a robust, tamper-proof Hardware Token in the modern I34 format. On the other hand, those who wish to secure Microsoft services or other TOTP-based platforms should opt for the C200 I34.