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https://codeberg.org/privacy1st/paper-secret
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74 lines
1.6 KiB
Markdown
74 lines
1.6 KiB
Markdown
# Paper-Secret
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Shamir Secret Sharing on paper using gfshare.
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## Installation
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### PyPi
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* https://pypi.org/project/paper-secret/
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### Dependencies
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`gfshare` is required to split and merge the secret.
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See `man gfshare` for an explanation of Shamir Secret Sharing in gf(2**8).
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```shell
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sudo pacman -S --needed libgfshare
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```
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`qrencode` and `imagemagick` (`convert`) are required to create and merge QR-codes during the split process.
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One can set the according parameters of `split_encode` to `False` to skip this step.
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```shell
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sudo pacman -S --needed qrencode imagemagick
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```
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`enscript` and `ghostscript` (`ps2pdf`) are required to create a PDF containing the split secret in text form.
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One can set the according parameters of `split_encode` to `False` to skip this step.
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```shell
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sudo pacman -S --needed enscript ghostscript
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```
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## Usage
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Create a secret:
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```shell
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cat > secret.txt
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```
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Split the secret into 5 lines:
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```shell
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enpaper secret.txt
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```
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Manually delete up to 2 of the 5 lines in `secret.txt_txt.txt`.
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Then recreate the secret:
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```shell
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depaper secret.txt.split-text.txt
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```
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Print the secret:
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```shell
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cat secret.txt.split-text.txt.merged.txt
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```
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## Notes
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* https://en.wikipedia.org/Shamir's_Secret_Sharing
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Manually reconstructing the secret from k strings:
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* For each string of the k strings
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* Create a file which name begins with `part` and ends with a dot and the first three characters of the string
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* For example `part.112`
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* Convert the 3rd to last character from base64 to binary and insert it into the file
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* Execute `gfcombine part.*`
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* The file `part` contains the reconstructed secret
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