Loop Optimization (Global)
High-quality technical overview of Loop Optimization in the context of blockchain security.
Mechanisms: 1. Object Ownership. 2. Permissions (RWX). 3. Access Control Lists. 4. Identity-based authorization. Comparison: DAC (Flexible) vs MAC (Strict/Centralized).
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🧒 Explique-moi comme si j'avais 5 ans
Imagine you have a secret diary. Because it's your diary, you get to decide who can read it. You might let your best friend read it, but not your brother. If you decide later that you don't want anyone to read it, you can take back those permissions. That's DAC: 'My [object](/fr/terms/object), my rules'.
🤓 Expert Deep Dive
Technically, DAC is implemented using 'Access Control Lists' (ACLs) associated with objects (files, folders, devices). Each entry in an ACL specifies a 'Subject' (user or group) and their 'Permissions'. In Unix-like systems, this is represented by the 'rwxrwxrwx' string, defining rights for the Owner, Group, and Others. The primary security weakness of DAC is that permissions are 'Transitive'. If User A grants User B 'Write' access to a sensitive file, and User B is compromised by a Trojan Horse, the malware can use User B's permissions to steal or delete User A's data. This is why high-security systems often supplement DAC with 'Mandatory Access Control' (MAC), where a central security policy overrides user discretion.