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YubiKey-Guide
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Update README.md 

Added primary source stating confirming that devices are read only in all but a few circumstances and that Keys ("secrets") cannot be read after being written to the device
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Gary Johnson 2019-09-24 23:55:37 -04:00 committed by GitHub
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This is a guide to using [YubiKey](https://www.yubico.com/products/yubikey-hardware/) as a [SmartCard](https://security.stackexchange.com/questions/38924/how-does-storing-gpg-ssh-private-keys-on-smart-cards-compare-to-plain-usb-drives) for storing GPG encryption, signing and authentication keys, which can also be used for SSH. Many of the principles in this document are applicable to other smart card devices. This is a guide to using [YubiKey](https://www.yubico.com/products/yubikey-hardware/) as a [SmartCard](https://security.stackexchange.com/questions/38924/how-does-storing-gpg-ssh-private-keys-on-smart-cards-compare-to-plain-usb-drives) for storing GPG encryption, signing and authentication keys, which can also be used for SSH. Many of the principles in this document are applicable to other smart card devices.
Keys stored on YubiKey are non-exportable (as opposed to file-based keys that are stored on disk) and are convenient for everyday use. Instead of having to remember and enter passphrases to unlock SSH/GPG keys, YubiKey needs only a physical touch after being unlocked with a PIN code. All signing and encryption operations happen on the card, rather than in OS memory. Keys stored on YubiKey are [non-exportable](https://support.yubico.com/support/solutions/articles/15000010242-can-i-duplicate-or-back-up-a-yubikey-) (as opposed to file-based keys that are stored on disk) and are convenient for everyday use. Instead of having to remember and enter passphrases to unlock SSH/GPG keys, YubiKey needs only a physical touch after being unlocked with a PIN code. All signing and encryption operations happen on the card, rather than in OS memory.
**New!** [drduh/Purse](https://github.com/drduh/Purse) is a password manager which uses GPG and YubiKey. **New!** [drduh/Purse](https://github.com/drduh/Purse) is a password manager which uses GPG and YubiKey.