Information and Network Security under The Shadow of Post Quantum Era (Text Book in Cyber Security)

A comprehensive, exam-ready treatment of information and network security for
the quantum age. Beginning with the CIA triad and classical ciphers, the book
builds through modern symmetric and asymmetric cryptography, hashing and digital
signatures, PKI, secure protocols (TLS, IPsec, PGP), and network defence, then
confronts the question that now reshapes the field: what survives a
cryptographically relevant quantum computer?

Written for undergraduate and postgraduate students and for practitioners
preparing for a migration, every primitive is presented with full algorithms,
step-by-step solved examples, figures and worked cryptanalysis, followed by a
"Post-Quantum Lens" that states plainly what quantum computing does and does not
break. The post-quantum chapters cover the NIST standards ML-KEM, ML-DSA and
SLH-DSA (FIPS 203/204/205), HQC, and hybrid key establishment for a safe
transition.

Inside this book:
- Classical, modern and post-quantum cryptography in one coherent arc
- Full algorithms with step-by-step solved examples and worked cryptanalysis
- Figures, flowcharts and diagrams for every major concept
- Quantum-threat analysis for each primitive (Mosca's inequality, Grover, Shor)
- Current standards and law, including FIPS 203/204/205 and data-protection duties
- A companion lab manual and a tested, runnable code repository

A self-contained course text that takes the reader from first principles to the
frontier of the post-quantum transition.
Chapters :
1. Security Goals, Attacks and the Security Model
2. Classical Ciphers and Cryptanalysis
3. Symmetric Block Ciphers: DES and AES
Explain the Feistel structure and prove that decryption reuses the same
round function.
4. Stream Ciphers and Randomness
Explain how a stream cipher turns a short key into a long keystream and
why the keystream must never be reused.
5. Public-Key Cryptography
Explain the public-key idea and the notion of a trapdoor one-way function.
6. Elliptic-Curve Cryptography
Describe an elliptic curve over a finite field and the group law on its
points.
7. Hash Functions and Message Authentication
State the three security properties of a cryptographic hash and the
avalanche effect.
8. Digital Signatures
Explain what a digital signature provides - integrity, authentication and
non-repudiation - and how it differs from a MAC.
9. Key Management, PKI, X.509 and Kerberos
Explain the key-distribution problem and the symmetric and asymmetric
approaches to it.
10. Authentication and Access Control
Distinguish identification, authentication and authorization.
11. Network and Transport-Layer Security
Locate security services in the TCP/IP stack and explain why each layer
adds its own protection.
12. Email and Web Security
Explain how PGP and S/MIME secure email using hybrid encryption and
signatures.
13. Malware, Software Flaws, Firewalls and Intrusion Detection
Classify malware and software vulnerabilities and explain how each causes
harm.
14. Risk Management and Security Policy
Define risk, threat, vulnerability and impact and relate them.
15. The Quantum Threat and Lattice-Based Cryptography
Explain, at a practical level, why a quantum computer threatens today's
cryptography, and distinguish the effects of Shor's and Grover's
algorithms.
16. Other Post-Quantum Families: Hash-, Code-, Isogeny-Based and QKD
Explain hash-based signatures (Lamport, Merkle) and the standard SLH-DSA.
17. Migrating to Post-Quantum Security
Explain crypto-agility and why systems must be able to switch algorithms.