Book Image

Blockchain Developer's Guide

By : Brenn Hill, Samanyu Chopra, Paul Valencourt, Narayan Prusty
Book Image

Blockchain Developer's Guide

By: Brenn Hill, Samanyu Chopra, Paul Valencourt, Narayan Prusty

Overview of this book

Blockchain applications provide a single-shared ledger to eliminate trust issues involving multiple stakeholders. It is the main technical innovation of Bitcoin, where it serves as the public ledger for Bitcoin transactions. Blockchain Developer's Guide takes you through the electrifying world of blockchain technology. It begins with the basic design of a blockchain and elaborates concepts, such as Initial Coin Offerings (ICOs), tokens, smart contracts, and other related terminologies. You will then explore the components of Ethereum, such as Ether tokens, transactions, and smart contracts that you need to build simple DApps. Blockchain Developer's Guide also explains why you must specifically use Solidity for Ethereum-based projects and lets you explore different blockchains with easy-to-follow examples. You will learn a wide range of concepts - beginning with cryptography in cryptocurrencies and including ether security, mining, and smart contracts. You will learn how to use web sockets and various API services for Ethereum. By the end of this Learning Path, you will be able to build efficient decentralized applications. This Learning Path includes content from the following Packt products: • Blockchain Quick Reference by Brenn Hill, Samanyu Chopra, Paul Valencourt • Building Blockchain Projects by Narayan Prusty
Table of Contents (37 chapters)
Title Page
About Packt

Historical perspective – classical cryptography

Cryptography is the term for any method or technique used to secure information or communication, and specifically for the study of methods and protocols for secure communication. In the past, cryptography was used in reference toencryption, a term that refers to techniques used to encode information.

At its most basic, encryption might take the form of a substitution cipher, in which the letters or words in a message are substituted for others, based on a code shared in advance between the parties. The classic example is that of the Caesar Cipher, in which individual letters are indexed to their place in the alphabet and shifted forward a given number of characters. For example, the letter A might become the letter N, with a key of 13.

This specific form of the Caesar Cipher is known as ROT13, andit’s likely the only substitution cipher that continues to see any regular use—it provides a user with a trivially reversible way of hiding expletives...