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PBKDF2 is not deprecated, but it is no longer the recommended default for new systems. Here is the honest, practical answer for developers: when PBKDF2 is still acceptable, when you should reach for Argon2id instead, and how to decide for your system.
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How hash functions make distributed ledgers possible: block identity, Merkle trees, proof-of-work, double-spend prevention, and quantum-era migration.
A decision framework for picking the right hash algorithm by use case: password storage, signatures, file integrity, hash tables, blockchain.
The most powerful cryptographic primitive you've never heard of. Zero-knowledge proofs prove you know something without revealing what you know, and
