Block signing

The security of the blocks is more sensitive than the security of individual transactions, since it is the base for the integrity of the whole chain. 

For this reason it was decided to impose the use of a Post-Quantum signature algorithm on the miner that offers much more long-term-security at the cost of longer signatures.

To achieve this goal we chose to use an algorithm whose construction is based on an NP-complete problem whose robustness can be proven formally. 

The algorithm is qTESLA‐p‐I targeting NIST's security category 1, chosen according to a security reduction and intended for more conservative, high‐security applications.

In addition to this, a forward security mechanism has been introduced. This requires the use of disposable cryptographic keys for clients operating according to blockchain rules. Thanks to this mechanism, an adversary, who managed to access the configurations of a Miner and compromise its main private key, could not in any case recreate the keys to sign the blocks already transmitted.

quantum-resistant, quantum, resistan, algorithm, signature, takamaka, blockchain

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