Jul 20, 2025 · 6 min read · Problem Understanding LeetCode 1948-Delete Duplicate Folders in System The goal is to delete all duplicate folder subtrees. Two folders are considered duplicates if they have the same structure and folder names in their subtrees. Solution 1: Standa...
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May 18, 2025 · 3 min read · 1. What Is Keyed Hashing? Regular hash functions (e.g., SHA-256) compute fixed-length digests from input messages, and anyone can compute or verify them. But in scenarios where only someone with a secret key should be able to compute or validate a ha...
Join discussionMay 18, 2025 · 3 min read · 🔐 Hash Functions Explained: The Backbone of Modern Cryptography Cryptographic hash functions are the unsung heroes of security. They're not just for password storage—they power digital signatures, secure messaging, software integrity, blockchain, in...
Join discussionSep 13, 2024 · 6 min read · Hàm băm (hàm hash) là một trong những thành phần cốt lõi của mật mã. Sở dĩ mình quyết định giới thiệu về hash là vì nó được sử dụng khá nhiều trong các kỹ thuật về blockchain như: wallet address, digital signature, merkle tree, bloom filter, proof-of...
Join discussionJun 18, 2024 · 4 min read · Introduction to Hashing Hashing is an essential component of data integrity, authentication, and security protocols, making it a critical concept in both computer science and cyber security. It involves converting any size of input data into a fixed-...
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Mar 26, 2023 · 2 min read · Hash functions play a critical role in blockchain technology. A hash function is a mathematical function that takes in an input (such as a file or data) and outputs a fixed-size string of characters. The output of a hash function is also called a "ha...
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Sep 5, 2022 · 1 min read · Information Word "information" in communication theory relates not so much to what you do say, but instead as to what you could say. No. of choices we can make = Amount of Information If information is more predictable => It conveys less informatio...
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