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To automate a TOTP login, your authorized automation must have access to the same shared secret as the service, use the service’s time-step and hash settings, calculate the current time counter, and submit the resulting code through the normal protected login flow. RFC 6238 uses a 30-second time step by default, but the verifier’s actual configuration controls what it accepts. Treat the seed as credential material: keep it in a secrets store, out of source control and logs, and restrict access.
What TOTP automation actually does
TOTP is the time-based form of HOTP. HOTP combines a shared secret with a counter; TOTP replaces the event counter with a value derived from Unix time. The prover (an authenticator or your automation) and verifier (the login service) independently calculate a short code and compare it.
RFC 6238 requires both sides to know or derive the current Unix time and to use the same time-step value. Its default step is 30 seconds. The specification is at RFC 6238; the underlying HOTP construction is defined in RFC 4226.
Automation is therefore account-specific. A code generated from another account’s seed, or from a seed transformed differently from the verifier’s copy, will not work. Possessing a seed is equivalent to possessing that account’s OTP credential, so automate only accounts and workflows you are authorized to operate.
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Before you write code: collect the verifier’s parameters
An authenticator enrollment URI commonly contains a Base32-encoded secret and parameters such as issuer, account name, algorithm, digits and period. Record the values supplied by the service rather than assuming every deployment uses defaults.
- Secret: the exact shared seed, normally Base32 encoded. Preserve its value and decode it as the library expects.
- Time step (period): RFC 6238’s default is 30 seconds, but a service may configure another value.
- Hash algorithm: SHA-1 is common in legacy provisioning, while the RFC also defines SHA-256 and SHA-512 options. Use the algorithm configured by the verifier.
- Digits: six digits is common; some systems use eight.
- Time basis: both sides need a current Unix-time basis. UTC is implicit in Unix time; local display time is irrelevant.
If you do not have the seed or cannot determine these settings, do not guess. Re-enroll the account through its approved process or ask the service owner for the supported configuration.
Generate a TOTP in Python without an external package
The following implementation follows HOTP/TOTP’s standard dynamic-truncation construction. It accepts a Base32 seed, computes the counter from Unix time and a configurable period, and returns a zero-padded code. It is an example for an authorized integration, not a way to bypass MFA.
import base64
import hashlib
import hmac
import struct
import time
def totp(secret_base32, *, at=None, period=30, digits=6,
algorithm="SHA1"):
if period <= 0 or digits <= 0:
raise ValueError("period and digits must be positive")
# Provisioning strings often contain spaces or hyphens.
normalized = "".join(secret_base32.split()).replace("-", "")
key = base64.b32decode(normalized.upper(), casefold=True)
timestamp = int(time.time() if at is None else at)
counter = timestamp // period
message = struct.pack(">Q", counter)
digestmod = {
"SHA1": hashlib.sha1,
"SHA256": hashlib.sha256,
"SHA512": hashlib.sha512,
}[algorithm.upper()]
digest = hmac.new(key, message, digestmod).digest()
offset = digest[-1] & 0x0F
binary = ((digest[offset] & 0x7F) << 24 |
(digest[offset + 1] & 0xFF) << 16 |
(digest[offset + 2] & 0xFF) << 8 |
(digest[offset + 3] & 0xFF))
return str(binary % (10 ** digits)).zfill(digits)
# Retrieve this from a secrets manager, not from source code.
secret = "YOUR_BASE32_SECRET"
print(totp(secret, period=30, digits=6, algorithm="SHA1"))Do not print the seed, the complete login response, or the generated code in production logs. If you need diagnostics, log a request identifier and a redacted status only. Read the secret at runtime from your organization’s approved secret store and give the process the narrowest possible permission.
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Using a TOTP library in an application
A maintained library can handle provisioning formats and algorithm details, but its defaults still have to match the verifier. The integration pattern is:
- Load the account’s seed from protected storage.
- Instantiate the library with the configured period, digits and hash algorithm.
- Generate the code immediately before submitting the login request.
- Send it over the service’s authenticated, encrypted channel and discard the value after use.
- Handle rejection without repeatedly retrying the same value; wait for a newly generated step when policy permits.
Do not copy a seed into a CI variable that is visible to every job, embed it in a mobile or browser bundle, or place it in a URL. Rotate or revoke the enrollment if the seed may have been exposed.
Why a correct-looking code is rejected
Clock drift
The most common cause is a system clock that differs from the verifier. Synchronize the host with an approved time source and check the Unix timestamp, not just the displayed local time. NIST says the verifier’s validity lifetime should account for expected clock drift, network delay and the time a claimant needs to enter the OTP.
Wrong period, digits or algorithm
A 30-second, six-digit SHA-1 calculation is only a default. Compare the enrollment parameters with the service configuration. A correct secret with a 60-second period, eight digits or SHA-256 mismatch will still fail.
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Damaged or altered Base32 data
Remove presentation spaces or hyphens only as appropriate, preserve the actual characters, and decode case-insensitively. Do not silently replace characters or copy a QR payload from an untrusted intermediary.
Submitting at a boundary
A code can expire while a request is in flight. Generate it immediately before submission and account for network and user-entry delay. Expanding the verifier’s acceptance window is not free: it increases the period in which a captured value might be accepted.
Account or enrollment mismatch
Each prover should have a unique key. Confirm that the automation is using the seed for the intended account and that the service has not reset or replaced the enrollment. If the seed is uncertain, revoke and enroll a new one through the service’s normal recovery process.
Verifier responsibilities: replay, channel and rate limits
Automation does not remove the verifier’s security obligations. NIST SP 800-63B-4, published in July 2025 for government information systems, requires strong protection of the shared key, an approved encrypted and authenticated channel for collecting the OTP, acceptance of a given OTP only once while it is valid, and effective rate limiting of failed attempts. See NIST’s authenticator guidance. That guidance is not automatically a legal requirement for every private service, but it is a useful security baseline.
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- Replay prevention: record successful OTP use and reject the same value again during its validity period. A time window alone does not prevent replay.
- Rate limiting: throttle failures per account, credential, source and other relevant dimensions. Short numeric codes are designed to be guessed eventually without limits.
- Secret protection: protect every duplicate of the seed, including backups, job artifacts and support exports.
- Protected collection: submit codes only through the real service endpoint over an authenticated, encrypted channel. Never send them to a page or service you have not verified.
Is TOTP phishing-resistant?
No. NIST states plainly, “OTP authentication is not phishing-resistant.” A manually entered TOTP is not cryptographically bound to the website, device or login session. A phishing site can ask for the current code and relay it to the real verifier before it expires. Automation can reduce typing and transcription errors, but it does not change this property.
Use a phishing-resistant method, such as a verifier-bound authenticator, when the service and threat model require that protection. TOTP remains useful as an additional factor and as a compatibility method, but do not describe it as phishing-resistant.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Testing and operating an authorized workflow
Test against a non-production account or the service’s documented test environment. Fix the time source and configuration before investigating application code. Keep the following checks in your runbook:
- Secret is retrieved at runtime and is absent from repositories, images, tickets and ordinary logs.
- Host time is synchronized and monitored.
- Period, digits and hash algorithm are explicit configuration, not hidden defaults.
- Code generation happens immediately before the login request.
- Retries do not replay a previously accepted value.
- Failures trigger bounded backoff and alerting rather than an unbounded loop.
- Enrollment revocation and seed rotation are documented.
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Frequently Asked Questions
Can TOTP generation work without an internet connection?
Yes. Code calculation needs the seed and a sufficiently accurate local clock; network access is needed only to reach the verifier and complete the login flow.
Does automating TOTP eliminate the need for a second factor?
No. The automation is the second-factor prover, and protecting its seed is essential. Anyone who obtains that seed can generate the same codes until enrollment is revoked.
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No. TOTP is software functionality as well as a capability found in some hardware authenticators. The standards do not require a physical device for code-generation automation.
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