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What is more secure for voice and SMS OTP: A random number or generated similar to HOTP?

Many providers are creating OTP authentication for their sign in. However I noticed that all the voice and SMS OTPs I've come across are a series of 6 digits... similar to the HOTP RFC Standard ...

asked Feb 22 at 15:20

makerofthings7
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What is more secure for voice and SMS OTP: A random number or generated similar to HOTP?

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