Key Sharding

Shamir's Secret Sharing is an advanced cryptographic method that splits your master key into multiple shares.

How It Works

Your master encryption key is mathematically split into multiple "shares" (shards). You decide how many shares are needed to reconstruct the key.

Example: (3,5) Scheme
  • 5 total shares created
  • Any 3 shares can reconstruct the key
  • 2 or fewer shares reveal nothing
  • Shares can be given to different people
Security Properties
  • Perfect Secrecy: Less than threshold reveals no information
  • Fault Tolerance: System works even if some shares are lost
  • No Single Point of Failure: No one person has complete access
  • Mathematically Secure: Based on proven cryptographic principles
Use Cases
  • Family Trust: Share with multiple family members
  • Business Succession: Distribute among board members
  • Estate Planning: Require consensus among beneficiaries
  • Backup Strategy: Store shares in different locations
Important Notes
  • Choose threshold carefully - not too low (insecure) or too high (inaccessible)
  • Keep shares in secure but accessible locations
  • Document who has which shares
  • Consider geographic distribution

Best Practice: Safeinity has found that more people than you might expect will lose shards, even when large sums of money are involved. Plan accordingly when setting the threshold. You will probably need extra shards.

Consider leaving one with your lawyer or other trusted professional. Leaving a shard in your safe deposit box or other secure location can help cover for lost shards. You will have to balance current security against the eventual need for access for loved ones.

We can work though these situations - sometimes - but the cost can be very expensive and the process can take weeks. It's best to avoid the situation entirely by planning carefully.