An implementation of Shamir's secret sharing scheme. Splits a file into several pieces of the same size with a specified number of pieces required to recover the file.
Do not use this for any sensitive data because there may be vulnerabilities that I am not aware of. This project was only made for fun.
| Option | Function |
|---|---|
| -r | Read given shares and output the secret |
| -w | Read given secret and output shares |
| -s [num] | When -w specified, gives the number of shares to write |
| -n [num] | When -w specified, gives the number of shares required to recover the secret |
| [file] | When -w specified, gives the file to be split into shares. When -r specified, gives as input a share to read |
| -o [file] | When -r specified, gives the file name of the output |
./shamir -w -s 5 -n 3 test.txt
Writes 5 shares called 0_test.txt, 1_test.txt, 2_test.txt, 3_test.txt, and 4_test.txt. Any 3 of these shares will recover the original file. For example, one could execute:
./shamir -r 1_test.txt 0_test.txt 4_test.txt -o test.txt
to get back the original file.