HMAC-based one-time password

HMAC-based one-time password (HOTP) is a one-time password (OTP) algorithm based upon a hash-based message authentication code (HMAC). When a client attempts to access a server, a challenge is sent by the destination server to the client.

Source: Wikipedia — HMAC-based one-time password (CC BY-SA 4.0)

HMAC-based one-time password

HMAC-based one-time password (HOTP) is a one-time password (OTP) algorithm based upon a hash-based message authentication code (HMAC). When a client attempts to access a server, a challenge is sent by the destination server to the client.

Source: Wikipedia "HMAC-based one-time password" · CC BY-SA 4.0

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