Multisignature (Global)
High-quality technical overview of Multisignature in the context of blockchain security.
Categories: 1. Symmetric (AES, ChaCha20). 2. Asymmetric (RSA, ECC, Diffie-Hellman). States: 1. At rest (Disk encryption). 2. In transit (TLS). 3. In use (Homomorphic).
graph LR
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🧒 Explique como se eu tivesse 5 anos
Imagine you want to send a secret note to your friend in [class](/pt/terms/class), but you don't want the teacher to read it if they catch you. You decide that for every letter you write, you will move one letter forward in the alphabet (so 'A' becomes 'B', and 'CAT' becomes 'DBU'). Your friend knows the secret 'Key' (move back one letter) and can read the note, but it's nonsense to everyone else. That's [encryption](/pt/terms/encryption).
🤓 Expert Deep Dive
Technically, we categorize encryption into 'Symmetric' and 'Asymmetric'. Symmetric encryption (like AES-256) is fast and best for large amounts of data, but requires both parties to safely share the same key. Asymmetric encryption (like RSA or ECC) uses a 'Public Key' (to encrypt) and a 'Private Key' (to decrypt), solving the key sharing problem but being much slower. Modern systems use 'Hybrid Encryption': They use Asymmetric encryption to safely share a Symmetric key, which is then used for the actual session (this is how HTTPS works). The strength of encryption is measured in bits—AES-256 is currently considered 'Quantum-resistant' for foreseeable future practical purposes.