Chapter 1
Operating Systems
Course: 220 1202 Comptia A Exam Core 2
Subject: 220 1102 Comptia A Plus Exam Core 2
Chapter: Security
1. Browser Download/Installation
1.1 Trusted Sources
- Description: Always download browsers from trusted sources, such as official websites or recognized app stores, to minimize the risk of downloading tampered or malicious versions.
- Hashing: Verifying the hash (checksum) of a downloaded file ensures its integrity and confirms it has not been modified. Real-Life Example: Before installing a browser, a user checks its hash value provided on the official website and compares it to the hash of the downloaded file to ensure it hasn’t been tampered with.
- What is Hashing? Hashing is the process of converting an input (or 'message') into a fixed-length string of bytes, typically a digest that represents the original input's data. Hash functions take input data of any size and output a hash value of a fixed length. The output, or hash, is unique to a specific input; even a small change in the input data will produce a drastically different hash value. Key Characteristics of Hashing: