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Foundations: Cryptography / Hash Functions

What Is Keccak-256?Keccak-256 matters because the name hides two different realities: a broad sponge-based hash family and a specific 256-bit variant used by systems like Ethereum

What Is Keccak-256?Keccak-256 matters because the name hides two different realities: a broad sponge-based hash family and a specific 256-bit variant used by systems like Ethereum. Once you see how the sponge construction trades speed for security through the rate and capacity, the design becomes much less mysterious.Mar 21, 202621 min read

#HASH FUNCTIONS

What is SHA-256?SHA-256 is the quiet workhorse behind block identifiers, commitments, address derivation, digital signatures, and many integrity checks across crypto systems

What is SHA-256?SHA-256 is the quiet workhorse behind block identifiers, commitments, address derivation, digital signatures, and many integrity checks across crypto systems. Its importance comes from a simple promise: a tiny change in input should produce a completely different 256-bit fingerprint that is easy to compute and hard to fake.Mar 21, 202624 min read

#HASH FUNCTIONS

What is Poseidon Hash?Poseidon hash matters because ordinary hashes are cheap on CPUs but expensive inside zero-knowledge proofs

What is Poseidon Hash?Poseidon hash matters because ordinary hashes are cheap on CPUs but expensive inside zero-knowledge proofs. Poseidon flips that tradeoff: it is built from finite-field arithmetic so Merkle trees, commitments, and private transactions can be proven with far fewer circuit constraints.Mar 21, 202624 min read

#HASH FUNCTIONS

What is a Cryptographic Hash Function?Cryptographic hash functions are one of the quiet load-bearing ideas in modern computing

What is a Cryptographic Hash Function?Cryptographic hash functions are one of the quiet load-bearing ideas in modern computing. They turn data of any size into a short fingerprint, and the reason that fingerprint is useful is not compression but a specific kind of one-way structure: it should be easy to compute, but infeasible to reverse or to fake by finding collisions.Mar 21, 202624 min read

#HASH FUNCTIONS