Passwords alone are no longer sufficient protection for banking, financial systems, administrative accounts, and other confidential information. One of the simplest ways to substantially strengthen account security is multi-factor authentication (MFA) using a dedicated hardware one-time-password token.
For organizations with significant security requirements, HOTP hardware tokens provide an attractive combination of security, simplicity, offline operation, and independence from a user’s phone.
What Is HOTP?
HOTP (HMAC-Based One-Time Password) is an open authentication standard defined by RFC 4226. Instead of generating a reusable password, an HOTP token generates a new numeric code each time the token is activated. The code is mathematically derived from a secret cryptographic key and an incrementing counter shared between the token and authentication system.
Learn more about the HOTP standard in RFC 4226.
A typical hardware HOTP token requires no cellular connection, Wi-Fi, mobile application, or connection to the Internet. The user presses a physical button, receives a one-time code, and enters that code when authenticating.
This makes hardware HOTP particularly useful for online banking, privileged administrative accounts, VPN access, financial systems, healthcare systems, and other environments where confidential information must be protected.
HOTP vs. TOTP
HOTP and TOTP are closely related but use different mechanisms for generating a one-time password.
HOTP is event-based. A new password is generated when the token is activated, usually by pressing a button. The token and authentication server maintain synchronized counters.
TOTP is time-based. It derives its one-time password from the current time, with codes typically changing every 30 or 60 seconds.
Learn more about the TOTP standard in RFC 6238.
For certain high-security applications, HOTP has useful operational advantages:
- No clock synchronization is required. HOTP devices do not depend on an accurate internal clock.
- Codes are generated deliberately. The counter advances when the token is activated rather than simply because time has passed.
- The device can remain completely offline. A simple display token requires no USB connection, smartphone, cellular service, or network connection.
- Authentication can be isolated from the user’s computer and phone. Malware compromising those devices does not automatically obtain the cryptographic secret stored inside the hardware token.
- Organizations control synchronization. RFC 4226 provides mechanisms for server-side counter synchronization and resynchronization.
HOTP should not, however, be considered universally more secure than TOTP. A TOTP code automatically expires after a short period, which is an important security advantage. An unused HOTP code can potentially remain valid until the counter advances or the authentication server’s synchronization rules invalidate it.
The primary security advantage is therefore dedicated hardware plus separation from general-purpose computers and smartphones, rather than HOTP alone.
For banking applications requiring even greater protection against phishing or manipulation of financial transactions, organizations may also use FIDO2 security keys, challenge-response authentication, or transaction-signing hardware. OneSpan, for example, offers banking devices that cryptographically bind transaction information such as the account and amount to the user’s approval.
Learn more about OneSpan transaction-signing authenticators.
Popular Hardware HOTP and Banking Authentication Tokens
Several established security manufacturers offer hardware authenticators suitable for financial institutions and other high-security environments.
Yubico — YubiKey 5 Series and YubiKey 5 FIPS Series
YubiKeys support the open OATH-HOTP standard in addition to FIDO2, WebAuthn, and other authentication technologies. Current YubiKey firmware can store multiple OATH HOTP or TOTP credentials, while HOTP can also be configured as a touch-triggered OTP function. YubiKey 5 FIPS models provide additional FIPS-validated options for regulated environments.
Hypersecu — HyperOTP Pro HOTP
The HyperOTP Pro HOTP is a dedicated six-digit, SHA-1, OATH-HOTP hardware token. Hypersecu offers both preprogrammed and NFC-programmable versions. Its standalone LCD design requires no physical connection to the computer, making it particularly useful where USB connections are prohibited. Hypersecu reports deployments in banking, government, and other industries.
HID — ActivID OTP Tokens
HID’s ActivID hardware token family includes Mini, Flexi, Token One, Pocket, and Desktop token designs. HID’s authentication platform supports OATH HOTP (RFC 4226) event-based authentication as well as TOTP and challenge-response configurations.
HID authentication documentation
OneSpan — Digipass GO 6 and Digipass GO 7 FIPS
OneSpan’s Digipass products are specifically positioned for banks, enterprises, and other high-trust environments. The Digipass GO 6 supports both OATH-HOTP and OATH-TOTP, while the Digipass GO 7 FIPS adds FIPS 140-2 Level 2 validation. Both provide simple one-button hardware OTP generation without requiring network connectivity.
Thales — SafeNet OTP 111 and OTP 112
The SafeNet OTP 111 and 112 are OATH-certified hardware tokens supporting both event-based HOTP and time-based TOTP configurations. They are standalone, single-button devices with approximately seven-year battery life and IP67 waterproof construction. The OTP 111 supports HMAC-SHA-1 while the OTP 112 adds HMAC-SHA-256.
RSA — SecurID 700
RSA SecurID is one of the best-known hardware authentication platforms in financial services, government, and other high-assurance organizations.
There is an important distinction: the SecurID 700 is a hardware OTP authenticator, but it is not an OATH-HOTP token. It uses RSA’s time-synchronized SecurID technology, typically displaying a new tokencode every 60 seconds.
Entrust — Hardware OTP Tokens
Entrust also offers dedicated physical OTP authenticators, including compact token and pocket-token form factors, for organizations that want authentication separated from smartphones and general-purpose computing devices. Entrust’s hardware-token portfolio is oriented toward enterprise identity and high-security authentication.
A Small Device Can Provide an Important Layer of Protection
Hardware OTP tokens have one major advantage that software authentication cannot completely duplicate: the authentication secret resides on a separate physical device.
For organizations protecting banking credentials, financial assets, administrative systems, client information, or other sensitive data, an inexpensive hardware token can provide a valuable additional barrier between an attacker and a critical account.
HOTP is especially attractive when organizations want a simple, offline, event-driven authentication device without dependence on smartphones, cellular networks, or synchronized clocks.
For the most sensitive applications, HOTP should be deployed as part of a broader MFA strategy incorporating strong passwords or PINs, appropriate server-side controls, and—where supported—phishing-resistant technologies such as FIDO2 or transaction signing.