.. _`Nitrokey Start`: https://shop.nitrokey.com/shop/product/nitrokey-start-6
.. _`Nitrokey Pro 2`: https://shop.nitrokey.com/shop/product/nitrokey-pro-2-3
.. _`Yubikey 5`: https://www.yubico.com/product/yubikey-5-overview/
-.. _Gnuk: http://www.fsij.org/doc-gnuk/
+.. _Gnuk: https://www.fsij.org/doc-gnuk/
.. _`potrete avere gratuitamente una Nitrokey Start`: https://www.kernel.org/nitrokey-digital-tokens-for-kernel-developers.html
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