# Cryptographic Specifications

#### Core Algorithms

EtheLock relies on industry-standard, audited cryptographic primitives. We do not roll our own crypto.

**Key Derivation Function (KDF)**

* **Algorithm:** Argon2id.
* Purpose: This is a memory-hard function used to hash your PIN. It is specifically designed to resist GPU and ASIC brute-force attacks. Even if an attacker had your card, guessing the PIN would be computationally prohibitive.

**Signing Curve**

* **Algorithm:** secp256k1.
* **Purpose:** The standard elliptic curve used by Ethereum and Bitcoin for generating public addresses and signing transactions.

**Symmetric Encryption**

* **Algorithm:** AES-256-GCM (Galois/Counter Mode).
* **Purpose:** Used to encrypt all data transmitted between the mobile app and the desktop dashboard. GCM provides both confidentiality (they can't read it) and integrity (they can't tamper with it).


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