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# Using TREZOR as a hardware SSH/GPG agent
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[](https://travis-ci.org/romanz/trezor-agent)
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[](https://pypi.python.org/pypi/trezor_agent/)
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[](https://pypi.python.org/pypi/trezor_agent/)
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[](https://pypi.python.org/pypi/trezor_agent/)
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[](https://pypi.python.org/pypi/trezor_agent/)
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See SatoshiLabs' blog posts about this feature:
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- [TREZOR Firmware 1.3.4 enables SSH login](https://medium.com/@satoshilabs/trezor-firmware-1-3-4-enables-ssh-login-86a622d7e609)
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- [TREZOR Firmware 1.3.6 — GPG Signing, SSH Login Updates and Advanced Transaction Features for Segwit](https://medium.com/@satoshilabs/trezor-firmware-1-3-6-20a7df6e692)
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## Installation
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First, make sure that the latest [trezorlib](https://pypi.python.org/pypi/trezor) Python package
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is installed correctly (at least v0.6.6):
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$ apt-get install python-dev libusb-1.0-0-dev libudev-dev
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$ pip install Cython trezor
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$ pip install -U setuptools
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Then, install the latest [trezor_agent](https://pypi.python.org/pypi/trezor_agent) package:
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$ pip install trezor_agent
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Finally, verify that you are running the latest [TREZOR firmware](https://wallet.mytrezor.com/data/firmware/releases.json) version (at least v1.4.0):
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$ trezorctl get_features | head
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vendor: "bitcointrezor.com"
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major_version: 1
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minor_version: 4
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patch_version: 0
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...
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If you have an error regarding `protobuf` imports (after installing it), please see [this issue](https://github.com/romanz/trezor-agent/issues/28).
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## Usage
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For SSH, see the [following instructions](README-SSH.md).
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For GPG, see the [following instructions](README-GPG.md).
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### Entering PIN
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Look at the digits shown on the TREZOR display and enter their positions using this regular numeric keyboard mapping:
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```
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|7|8|9|
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|4|5|6|
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|1|2|3|
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```
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For example, if your PIN is `1234` and your TREZOR is displaying the following:
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```
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|3|1|2|
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|7|5|8|
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|6|4|9|
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```
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You have to enter `8972`.
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## Troubleshooting
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If there is an import problem with the installed `protobuf` package,
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see [this issue](https://github.com/romanz/trezor-agent/issues/28) for fixing it.
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### Gitter
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Questions, suggestions and discussions are welcome: [](https://gitter.im/romanz/trezor-agent)
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