## TL;DR
Cybersecurity protects digital systems through layered defense: cryptography secures data; network security blocks attacks; Zero Trust eliminates implicit trust. The threat landscape evolves as fast as the technology it defends.

## Core Explanation
The CIA triad: Confidentiality (encryption, access control), Integrity (hashing, digital signatures), Availability (DDoS protection, redundancy). Symmetric encryption (AES — same key encrypts/decrypts) vs asymmetric (RSA, ECC — public key encrypts, private key decrypts). Hashing (SHA-256) provides data integrity verification.

## Detailed Analysis
Defense layers: firewall (packet filtering), IDS/IPS (intrusion detection/prevention), endpoint protection (antivirus, EDR), SIEM (security information and event management). The human factor remains the weakest link — phishing accounts for 90% of data breaches.

## Further Reading
- OWASP Top 10
- NIST Cybersecurity Framework
- Krebs on Security