One-time password (OTP) protocols and implementations (software and hardware)

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OTP for syncing mobile device

Scenario: a web app with two-factor authentication using username/password and hardware OTP. Once logged into the app, one of the app modules should be used in a tablet or any mobile device without a ...
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Where is the TOTP secret key stored on client applications?

I'm new to concept of TOTP, but as I understand, 16-character base32-encoded shared secret is stored in the client application(for example Authy, FreeOTP)? This means that if I remove the application, ...
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KeePass OTP plugin circumvents inbuilt protections?

I have read the question on HOTP implementation in KeePass HERE. This question is however on the other newer plugin KeeChallenge. According to the documentation, the a secret is encrypted and can ...
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Storage of the One Time Password Seed

I'm a student and I'm working on an OTP authentication systeme based on OATH using smart phones as tokens for the clients. My problem is the protection the OTP seed at both client and validation ...
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FIDO, U2F Compatibility

I've been following the FIDO standard (a consumer-friendly public-key system similar to SSH key pairs) and it appears that it's close to being complete: both Google and PayPal have been testing it ...
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Algorithm to Transaction Data Signing

Transaction Data Signing I need an idea to develop a very secure algorithm to authenticate online operations using PHP in the server and an Android app in the user's device. What is the idea? The ...