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note sharding secrets

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Malin Freeborn 2024-05-13 20:15:28 +02:00
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---
title: "Sharing Secrets"
tags: [ "data", "death", "secrets", "ssss" ]
---
You can share parts of a secret with multiple people, so only some of them need to agree to see the secret.
Install `ssss`, then decide on the total number of secrets (`N`), and the threshold of people who must share their shard of the secret in order to reveal the secret.
```bash
N=5
T=3
FILE=secret.txt
fortune | ssss-split -t $T -n $N > $FILE
```
Each shard is a line inside secret.txt.
Check it's working:
```bash
head -n $T $FILE | ssss-combine -t $T
tail -n $T $FILE | ssss-combine -t $T
```