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otphp
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:closed_lock_with_key: A PHP library for generating one time passwords according to RFC 4226 (HOTP) and the RFC 6238 (TOTP)
1time
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Lightweight, thread-safe Java/Kotlin TOTP (time-based one-time passwords) and HOTP generator and validator for multi-factor authentication valid for both prover and verifier based on shared secret
php-authenticator
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A generator for counter- and time based authentication codes (RFC-4226/RFC-6238, Google Authenticator).