Cryptography on Kevin wang's bloghttps://kevinwang930.github.io/tags/cryptography/Recent content in Cryptography on Kevin wang's blogHugoen-USThu, 23 Jul 2026 12:20:11 +0800Cryptographic Primitives: Encoding, Hashing, and Encryptionhttps://kevinwang930.github.io/post/computer/encryption/Thu, 23 Jul 2026 12:20:11 +0800https://kevinwang930.github.io/post/computer/encryption/<p>Cryptography in networked systems combines several <strong>primitive classes</strong> that are often conflated: encoding, hashing, symmetric encryption, and public-key operations. This post gives an <strong>overview</strong> of those classes, then the <strong>mechanisms</strong> of common algorithms—including elliptic-curve group law, ECDHE, ECDSA, AEAD, and HKDF—and finally <strong>protocol-level</strong> composition (TLS sessions, SASL, OpenPGP-style signatures) with tool examples. Encoding is not encryption. Hashing is not encryption. Secret keys must come from a CSPRNG; see <a href="../java-random/">Random Number Generation in the JDK</a>.</p>