Access Control (Global)
High-quality technical overview of Access Control in the context of blockchain security.
Common mechanisms include: 1. ACLS: A list attached to an object specifying which users have permissions. 2. Capability Lists: A list attached to a user specifying which objects they can access. 3. Trust-based mechanisms: Often used in P2P networks. 4. Token-based mechanisms: Like OAuth2, which use a signed token to verify authorization without re-authenticating.
graph LR
Center["Access Control (Global)"]:::main
Rel_access_control_mechanisms["access-control-mechanisms"]:::related -.-> Center
click Rel_access_control_mechanisms "/terms/access-control-mechanisms"
Rel_access_control_security["access-control-security"]:::related -.-> Center
click Rel_access_control_security "/terms/access-control-security"
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🧒 5 yaşındaki gibi açıkla
If Access Control is the rule 'Only teachers can go in the teacher's lounge', then the access control mechanism is the actual keypad on the door that requires a specific code that only teachers have.
🤓 Expert Deep Dive
Mechanisms are generally categorized into: 1. Discretionary mechanisms (ACLs on files). 2. Mandatory mechanisms (Security Labels in SELinux). 3. Role-based mechanisms (Active Directory groups). A key distinction in modern engineering is between 'Ambient Authority' (where access is implied by identity) and 'Object Capabilities' (where access is granted via a specific, unforgeable token or reference). Modern web security heavily relies on JSON Web Tokens (JWT) as a stateless mechanism for propagating authorization state across microservices.