# Yubikey 5c doesn't ask for a PIN

**URL:** <https://forum.dfinity.org/t/yubikey-5c-doesnt-ask-for-a-pin/29601>\
**Category:** internet-identity\
**Tags:** internet-identity\
**Created:** [April 11, 2024, 9:25pm UTC](https://forum.dfinity.org/t/yubikey-5c-doesnt-ask-for-a-pin/29601 "2024-04-11T21:25:03Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![let4be](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/let4be/32/25128_2.png) [@let4be](https://forum.dfinity.org/u/let4be)\
**Post date:** [April 11, 2024, 9:25pm UTC](https://forum.dfinity.org/t/yubikey-5c-doesnt-ask-for-a-pin/29601/1 "2024-04-11T21:25:03Z")

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I’ve tried adding YubiKey as a Passkey to an Internet Identity to test several things…

It’s working okay but to my HUGE surprise it doesn’t ask for a pin - which is horrible for security, what happenes if someone steals it or I just lose it.

Does it mean someone can just go and brute force all Internet Identity numbers(it’s not so hard, they are all sequential and correlated with II creation date) and use this YubiKey like nothing happened?..

Seems like a GLARING security hole

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**Author:** ![let4be](https://sea1.discourse-cdn.com/flex023/user_avatar/forum.dfinity.org/let4be/32/25128_2.png) [@let4be](https://forum.dfinity.org/u/let4be)\
**Post date:** [April 11, 2024, 9:27pm UTC](https://forum.dfinity.org/t/yubikey-5c-doesnt-ask-for-a-pin/29601/2 "2024-04-11T21:27:44Z")

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The only reasonable way I can see is to use Trezor’s FIDO U2F as Trezor enforces manual unlock with a pin before it can be used as U2F(or anything else for that matter)

But Trezor is bulky, I’d really like to use something like Yubikey., just not without a mandatory PIN