Blockchain and cyber security

Blockchains, by design, are not ideal for storing large amounts of data . Instead, when a transaction is logged onto a blockchain—say, a record of purchase—that event is logged across nodes. That’s called “on-chain” data.

To preserve the privacy of the involved participants, symmetric or asymmetric encryption can be used to encrypt data before inserting the data into the blockchain as transactions. … Then the transaction with the encrypted data is submitted to the blockchain.

Blockchain made the world realize that they can transact without the help of a third party or a central authority to mediate on transactions. All data is secured with encryption so nobody can alter with blockchain without other members of the ecosystem noticing.

Blockchain as an Alternative Bitcoin, the first Blockchain application, allows a network of users to perform transactions without requiring the trust of anyone on the network, or a third party. Everything is encrypted, and nobody can tamper with the Blockchain without everyone else noticing immediately .7 Kas 2017