What is a One-Time Passcode (OTP)?

A One-Time Passcode (OTP) is a unique and temporary code generated for authentication purposes, typically used in conjunction with or as an alternative to traditional passwords. Leveraging OTPs:

• Enhances security: By being valid for only a short duration or single use, OTPs minimize the risks associated with compromised credentials.
• Promotes passwordless authentication: With OTPs, systems can bypass the need for fixed passwords, moving towards a passwordless future.
• Improves user experience: Users can authenticate without remembering complex passwords, often receiving OTPs via SMS, email, or dedicated authentication apps.

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Before the rise of sophisticated hacking tools, static passwords sufficed. As cyber threats evolved, the need for stronger authentication methods emerged. Enter OTPs. This dynamic form of authentication added an extra layer of security, rendering stolen credentials useless after a single use.

• Delivery Methods: OTPs can be delivered in various ways including SMS, emails, or through applications like Google Authenticator or Authy.
• Time-based vs Counter-based: Time-based OTPs (TOTP) are valid for a specific duration, while counter-based OTPs change after a certain number of uses.
• Integration with Systems: Integrating OTPs into systems usually requires communication with an SMS gateway or authentication API.

The digital world is moving towards passwordless methods, and OTPs are a significant step in that direction. Instead of relying on a password that users might forget, OTPs offer a dynamic, secure, and user-friendly alternative.

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The advantage of OTP via e-mail is the reduced costs, especially in contrast to SMS OTP. Regarding security, of course it's important that the e-mail account of the user is not compromised, but only accessible with secure authentication options.

An OTP is temporary and unique, meaning that even if intercepted, it's of little use to cybercriminals due to its short lifespan or single-use nature.

While SMS is a common delivery method for OTPs, it's not the most secure due to potential SIM swapping or interception risks. Using dedicated authentication apps or hardware tokens can offer greater security.

OTPs are often a component of MFA. While a password (something you know) is one factor, an OTP (something you receive) acts as a second, separate factor, enhancing security.