BlockChains & Cryptography from Scratch

An Exploration into the world of smart contracts. I have a stab at building Smart Contracts, which are under ./Solidity/Build/. Meanwhile also exploring the exploits and vulnerabilities found in Solidity: From Re-Entrancy exploits draining all the ether from a smart contract and Phishing Attacks to get Priviledge Escalation, upto catching other Hackers using HoneyPot retaliation.

I explore the bit by bit building of Solidity Code, along with the best practices.

• ContractFactory: A contract that generates other contracts; also uses inheritance
• Error: Require, Assert, Revert
• FullGasAhead: Usage of Gas in Ethereum
• FunMod: Using Function Modifiers
• GetSet: Getter and Setter functions
• HelloWorld: The classic Hello World
• Inderitance: Deriving children contracts from parent contracts
• MapsAndArrays: Usage of maps (dicts) and arrays (lists)
• Payable: Sending and Receiving Ether
• PureView: Controlling the views using: Pure, View, Other
• SigningAndVerification: The heart of BlockChain; signing and verification using ECDSA
• StructsAndEnums: Self-Explanatory
• Visibility: Public, Private, Internal, External

Quick Note: view != visibilities

A list of all the Solidity Exploits:

• Overflow Attack
• Underflow Attack
• ReEntrancy Attack
• Self-Desruction Attack
• Denial of Service (DoS) Attack
• Phishing Attack
• Hiding Malicious Code
• Honey Pot Retaliation

I have also included the fixes for the attacks: Exploits and Attacks Fixes

A head first dive into the cryptography used in the modern day technologies. I've explored RSA & ECC, both of which are already in use widely and have had substantial impact on the current Scuerity Systems. ECC is more powerful, and has seen numerous applications in blockchain. We explore one of the standards used in Bitcoin; secp256k1.

decsription to be added

Elliptic Curve Cryptography is much more efficient, in the number of bits required to effectively encrypt/decrypt, sign/verify information.