OTP
Abbreviation · Security & Infosec
Definitions
One-Time Password — a dynamically generated code valid for a single login session or transaction. TOTP (time-based) and HOTP (counter-based) are the two main flavors, commonly delivered via authenticator apps or SMS.
In plain English: A temporary password that works only once, usually a 6-digit code from an app on your phone, adding a second layer of security beyond your regular password.
Example: "Enter the 6-digit OTP from your authenticator app to complete the login."
Related Terms
- TOTP
- Multi-Factor Authentication
- Authentication
- Wallet
- mTLS
- DAST
- Passkey
- Threat Modeling
- API Key vs Token
- Anti-Forensics
- Anti-Malware
- Authentication Bypass
- Behavioral Biometrics
- Bluetooth Sniffing
- Business Email Compromise
- CAPTCHA
- CAPTCHA Bypass
- Cookie Poisoning
- Credential Harvesting
- Credential Replay
- DKIM
- DMARC
- EAP
- Email Authentication
- Email Bombing
- Federated Identity
- HTTP Parameter Pollution
- HTTP Request Smuggling
- HTTP Response Splitting
- HTTPS Stripping
- ICMP Tunneling
- Identity and Access Management
- Identity Provider
- IDS Evasion
- Log Forging
- Log Tampering
- Multi-Factor Authentication Bypass
- NTLM
- OAuth Token Theft
- Open Redirect
- Wi-Fi Protected Access
- Password Hashing
- 2FA Fatigue
- 802.1X
- Account Enumeration
- Biometric Bypass
- Blockchain Security
- Cookie Hijacking
- Cryptographic Signature
- Non-Repudiation
- RADIUS
- Relay Attack
- Credential
- Credential Provider