We Web3 practitioners authorize and sign transactions in our wallets every day; these are applications of cryptography. Although we may not understand cryptography, we can still complete interactions, but Pepe thinks that since everyone has been in the circle for so long, it's best to understand some underlying concepts. So today, we're emphasizing that knowing a bit is not really useful, but not knowing is a bit low 🐶.

What is cryptography? The concept of cryptography sounds quite cutting-edge, right? Actually, it is like the guardian of our information security, ensuring the secure transmission and storage of information, and preventing unauthorized access and tampering.

The core goals of cryptography:

Confidentiality: Only authorized individuals can see our secrets.

Integrity: Ensuring that information is not tampered with during transmission.

Authentication: Confirming that the information comes from a trusted source.

Non-repudiation: Ensure that the sender cannot deny having sent the information.

Asymmetric encryption: Imagine you have a public mailbox (public key) and a private safe (private key). You can tell anyone your mailbox address, but only you can open the safe. This is the magic of asymmetric encryption! Introducing two typical encryption methods:

RSA: Based on large prime factorization, like a mathematical puzzle, protecting our security.

ECC: Based on elliptic curves, compact and efficient, protecting our devices.

Hash function: It's like a one-way portal; data goes in, and out comes a fixed-length hash value that can never go back!

SHA-256: The guardian of Bitcoin, protecting the immutability of the blockchain.

SHA-3: Based on the Keccak algorithm, providing higher security.

Digital signature: Encrypting information with a private key and verifying it with a public key to ensure the sender's identity and integrity of the information.

Applications in blockchain:

Transaction signature: Only legitimate holders can initiate transactions, protecting transaction security.

Hash chain: Each block contains the hash of the previous block, forming an immutable chain.

Smart contracts: Automatically executed and immutable, protecting the execution of contracts.

Cryptography is the cornerstone of Web3 and blockchain, protecting our digital world. Now that you've mastered the basics of cryptography, #加密市场回调 #美国初请失业金人数 $ETH $BTC