Cryptography — Prelims Strategy

Prelims Strategy

For Prelims, a strong conceptual foundation in cryptography is non-negotiable. Begin by clearly understanding the core objectives: confidentiality, integrity, authentication, and non-repudiation. Differentiate meticulously between symmetric and asymmetric encryption, memorizing key algorithms (AES for symmetric; RSA, ECC for asymmetric) and their primary use cases.

Understand the 'why' behind each type. For hash functions, focus on their one-way nature, fixed output, and role in integrity and digital signatures (SHA-256 is a must-know). Grasp the basics of Public Key Infrastructure (PKI) and Certificate Authorities (CAs).

Pay close attention to the implications of quantum computing on current encryption standards and the distinction between quantum cryptography (QKD) and post-quantum cryptography (PQC). Memorize key provisions of the IT Act 2000 and the relevance of RBI and CERT-In guidelines.

Practice MCQs that test conceptual understanding, comparisons, and applications. Vyyuha's advice: create flashcards for algorithms, their properties, and their primary functions. Don't get bogged down in the mathematical intricacies; focus on the 'what' and 'why' from an application perspective.