ISC — Quick Sheet
Information Security Fundamentals
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One-minute revision
- CIA: Confidentiality, Integrity, Availability
- MFA = factors from different categories (know / have / are); password + security question ≠ MFA
- Symmetric = one shared key, fast; asymmetric = public encrypts, private decrypts
- Digital signature: sign with your private key, verify with your public key. Confidential message: encrypt with recipient's public key
- Ransomware defense = tested offline backups; SQL injection defense = input validation/parameterized queries
- Principles: least privilege + defense in depth