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Cryptography Applied Engineering

⬢ 層級 3技術
高
薪資影響
4 個月
學習時長
困難
難度
4
職業
一覽

Applied cryptography is choosing and implementing cryptographic algorithms (AES, RSA, ECDSA, SHA-256) correctly. Wrong choices or implementations lead to stolen data, fake signatures, or broken systems. Mastery requires: understanding algorithm theory, knowing what breaks what, testing for side channels, and keeping current on research. Mastery takes 8-12 weeks. Senior cryptography engineers earn $250-400k because they prevent billion-dollar breaches. Becoming one of the 1% of engineers who can design cryptographic systems correctly is career-defining.

什麼是 Cryptography Applied Engineering

Applied cryptography is taking cryptographic algorithms (AES, RSA, ECDSA, SHA-256) and using them correctly to solve real security problems: encrypting data at rest, authenticating messages, securing key exchange, signing documents. Core areas: symmetric encryption (fast, shared key), asymmetric encryption (slow, public-key), hashing (one-way, for integrity), key derivation (derive keys from passwords), authenticated encryption (encryption + authentication combined).

🔧 工具與生態
OpenSSLlibsodiumCryptography libraries (Python, Rust)Key derivation librariesTesting frameworksFormal verification toolsSide-channel analysisFuzz testingCryptographic audit toolsNIST standards

💰 各地區薪資

地區初級中級高級
USA$130,000$220,000$400,000
UK£82,000£140,000£255,000
EU€90,000€155,000€280,000
CANADACA$135,000CA$230,000CA$420,000

❓ 常見問題

What's the difference between symmetric and asymmetric cryptography?
Symmetric: same key encrypts and decrypts (AES-256). Fast, 256-bit key = 2^256 security. Problem: how do you share the key securely? Asymmetric: two keys (public encrypts, private decrypts). Slower, larger keys (2048 bits = 112-bit security). Solves key distribution problem.
When should I use RSA vs ECDSA?
RSA: older, slower, larger keys, widely trusted. ECDSA: newer, faster, smaller keys, same security with shorter keys. EDDSA: best choice for new systems (faster, safer than ECDSA). Use ECDSA/EDDSA for new work. RSA for backwards compatibility.
How do you prevent timing attacks?
Timing attack: measure how long crypto function takes. If time varies by input, you leak information (e.g., which password bytes are correct). Prevention: use constant-time implementations (operations take same time regardless of data). Use libraries like libsodium that guarantee this.
What's a side-channel attack?
Information leaks through physical implementation (not the algorithm itself). Examples: measuring power consumption, electromagnetic emission, cache timing. Can break encryption even if algorithm is mathematically sound. Mitigation: use hardware designed for resistance (Intel SGX, Apple Secure Enclave).
Why shouldn't I implement crypto from scratch?
Too easy to get wrong. NIST recommends using vetted libraries (OpenSSL, libsodium). If you must implement, use formal verification (prove it's correct mathematically). Most bugs are in implementations, not algorithms.
What's the difference between encryption and authentication?
Encryption: make message unreadable (AES). Authentication: prove sender is who they claim (HMAC, signatures). Both needed: encrypted but unauthenticated message can be modified without detection. Use authenticated encryption (AES-GCM).
How long are cryptographic keys and why?
AES-256: 256 bits (secure against quantum: ~2^128 effort). RSA-2048: 2048 bits (secure against classical ~2^112). ECDSA-256: 256 bits. EDDSA-256: 256 bits. Post-quantum: 2048-4096 bits (NIST standards emerging). Longer = more secure but slower.

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