Hard Live

Common secret

90 points

29 Solves

Cryptography

andreigasparovici

Community Rating: 4.58 / 5

Headline

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Here is the list of employees. https://mega.nz/#!PSBVFYwI!KxAhazVh9X-BP9SEfRRKb8yYHonPDJDU1FtQxO8OvMM Their task is to keep a vault safe. No one knows the key to open the vault, but each one of them has a secret key. In order to open the vault, any 3 of them have to meet and put their keys together. By doing so, they will get the key to open the vault. Given the secret key of each employee, can you figure out the key to open the vault? https://en.wikipedia.org/wiki/Lagrange_polynomial

First 10 Solvers

Rank Username
1 bloodhound
2 Yeraisci
3 HIGH0101
4 samanshf
5 kronos
Rank Username
6 Deathstar
7 nh4ntz
8 vidar
9 und1sclos3d
10 platypusranger

Comments

    • Gilad ctflearn++ badge

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      [REDACTED] This comment is only shown to users who have solved this challenge.

    • Gilad ctflearn++ badge

      0.0

      The modulus is indeed computed from the equations

    • Rivit

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    • Caillou

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      Jagogo - about flag format its classic one, as we have one all other challenge

    • Caillou

      0.0

      Hi Basherru / Jagogo Id are not encoded. You both have close problem. Perhaps it come from the way you convert inputs keys.

      • teax

        0.0

        Is the id the x co-ordinate, or is the secret split in two?

    • Jagogo

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    • basherru

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