Making an audit against a smart contract is a great thing. However, finding vulnerabilities without fixing them is useless. Unfortunately, smart contracts are immutable by design, which means that once the smart contract is deployed, it cannot be changed. So how to fix a smart contract? To fix a vulnerable ...
To be able to perform the different tasks and execute the operations in its source code, smart contracts require a certain level of gas. This gas is paid by the user that tries to execute the smart contract using a transaction. However, when the user does not send enough gas ...
The transaction life cycle in most Blockchain technologies is mainly controlled by miners, even the order of the transactions. Therefore, when two users execute two different transactions at the same or closer time then only their gas fees will judge who will be executed first. This concept creates a vulnerability ...
In June 17, 2016 the most famous DAO platform developed by solidity language was victim to a big hack that make it lose more than 3.6 million Ether. The attacker has exploited a vulnerability called reentrancy in the smart contract that managed the platform. So what is a reentrancy attack ...
During the development of a smart contract, programmers may need to know the exact time to be able to execute some actions. Therefore, smart contract developers use what we call a timestamp offered by the node executing the smart contract. However, this may cause create multiple vulnerabilities that can cause ...
Honeypot programs are one of the best tools that security researchers have ever made to study the new or unknown hacking techniques used by attackers. Therefore, using honeypots in smart contract could be a very good idea to study those attacks. So what is honeypot in smart contract? Honeypots in ...
Due to the immutability of smart contracts, checking their security before deploying them in any Blockchain is one of the most critical steps in their development lifecycle. However, this process could be very challenging in terms of both required knowledge and time to perform such an audit. Therefore, using tools ...
With the rise in the number of Blockchain cryptocurrency users and the mass adoption of electronic wallets, the number of cyber-attacks that target this specific component of the Blockchain is rising too. Therefore, knowing the different types of Blockchain wallets will help the Blockchain security auditor to better locate the ...
Blockchain networks are built upon the concept of the transaction, either for transferring money or to even setting up a smart contract. However, each transaction performed in the Blockchain has a specific life cycle that all of them follow to reach their goal. This life cycle could be simple or ...
How do you choose a consensus mechanism? The consensus mechanism is responsible for the security of the Blockchain data. Therefore, choosing the right mechanism during the building of the Blockchain is an inevitable action. However, this task is not always evident to do as it may impact the whole Blockchain ...
Blockchain technology was indeed built with security in mind. This means that it is supposed to be very secure compared to other technologies. However, Blockchain technology suffers from some weaknesses that can be exploited to damage the system. So what are Blockchain attacks? Blockchain technology could be attacked at each [...]
