SplitShare

Shamir's Secret Sharing Algorithm implementation in Golang combined with PGP and a mail delivery system

SplitShare uses Shamir's Secret Sharing Algorithm to split a secret in multiple parts and PGP to encrypt each share with the public key of the owner and then send the encrypted share via mail.

Usage

You can download and run the pre-builted binary or build it from source.

To work properly SplitShare needs:

• The public key of each user
• The secret stored in a file
• A working SMTP server

./splitshare <SECRET FILE>

Starting SplitShare will ask for:

• Maximum number of shares
• Minumum amount of shares needed to decrypt the secret

And for each user:

• The users mail
• The path of the public key

Alternatively you can load a public keyring file with users public key and SplitShare will automatically load keys from user's email.

./splitshare --pub-keyring ./pubring.gpg <SECRET FILE>

NOTE: you must configure the SMTP credentials inside the config.toml file.

Building

To build SplitShare you need the following packages:

github.com/SSSaaS/sssa-golang
github.com/TheZ3ro/go-pgp/pgp
github.com/go-mail/mail
github.com/spf13/viper

You can then clone the repo and build it with:

git clone https://github.com/Nhoya/SplitShare
go build splitshare.go

Decrypt

To decrypt the secret you need the tool located inside the decrypt directory

You can either build it or use the pre-builted one.

Building the decryption tool

To build the decryption tool you just need:

github.com/SSSaaS/sssa-golang

You can then clone the repo and build it with

git clone https://github.com/Nhoya/SplitShare
cd SplitShare/decrypt
go build decrypt.go