Why This Cheat Sheet Matters for SECPLUS
This cheat sheet covers the most important Cryptography & PKI concepts tested on the SECPLUS (Security+) certification exam. It contains 1 sections with 6 key points. Use this as a quick-reference guide during your final review sessions.
1Sections
6Key Points
Algorithm Types
- Symmetric: same key encrypts/decrypts. Fast. AES (128/192/256), 3DES, ChaCha20.
- Asymmetric: public/private key pair. Slower. RSA, ECC, Diffie-Hellman.
- Hashing: one-way function. SHA-256, SHA-3, MD5 (insecure), HMAC (hash + key).
- Key exchange: Diffie-Hellman establishes shared secret over insecure channel.
- Digital signatures: hash + private key = signature. Proves integrity and non-repudiation.
- PKI: CA issues certificates binding public key to identity. Chain of trust.
Practice Cryptography & PKI Questions
Put your knowledge to the test with practice questions.
CompTIA Acronym Quick Reference
CompTIA exams are packed with acronyms — memorising key acronyms and their meanings is critical. Each exam has an official list of acronyms in the exam objectives document. Focus on acronyms that appear across multiple domains, as these represent the most frequently tested concepts. Our flashcard decks are designed to drill these acronyms efficiently.