1. Which of the following is not a property of a cryptographic hash function? A) Deterministic B) Produces a fixed-size output C) Easy to reverse D) Collision-resistant 2. What is the primary purpose of using a cryptographic hash function in blockchain? A) To encrypt data B) To reduce...
This article discussed the blockchain basics overview, architecture, and blockchain security components such as hash function, Merkle tree, digital signature, and Elliptic curve cryptography (ECC). In addition to the core idea of blockchain, we focus on ECC's significance in the blockchain. We ...
HASH FUNCTIONS + BLOCKCHAINS TAMPER EVIDENT BLOCKS block 2 block 3 block 4 block 1 H(block 0) H(block 1) H(block 2) H(block 3) H H H H H H tx tx tx tx A malicious node changes a transaction in a previous block What happens to the block hashes? 22 Cryptographic Hash Func...
35. What is a hash function? A hash function is a set of mathematical calculations performed on two blocks of data, with the primary input divided into two blocks of similar size. 36. What is the block size in a hash function? The block size depends on the algorithm used. 37. What a...
1. Overview of Blockchain Technology 2. Cryptographic Hash Function 3. Understanding Blockchain with Cryptocurrency 4. Distributed Consensus in Open Environments 5. Understanding Blockchain for Enterprises 6. Distributed Consensus in Closed Environment ...
This is like Alice only use the encryption function to generate a one-time pad, and Bob use the same encryption function to generate the same pad. 7. Cryptographic Hashes Let H be the cryptographic hash function, M be the message. Properties of hash functions include:...
Discover all you need to know about these systems that is used to maintain the integrity and security of blockchain.
An overview of public-key cryptography is shown in the following diagram:Figure 4.1: Encryption/decryption using public/private keysThe preceding diagram illustrates how a sender encrypts data P using the recipient's public key and encryption function E, and produces an output encrypted data C, ...
The hash function takes the message as input and produces a fixed size string, which is called as the hash value or message digest. This hash value is appended with the sending message to ensure message integrity. The main advantage is that, if there is any alteration in the message during...
Since public key operations are expensive, often a hash function—a cryptographic compression function—is applied to a long message or file before it is signed. In this case, the signature consists of plaintext appended to the signature of the hash. The signature is verified by applying the ...