Kyber (ML-KEM)

Definition

Kyber is a lattice-based key encapsulation mechanism (KEM) selected by NIST as the primary post-quantum standard for key exchange. Officially designated ML-KEM (Module Lattice-Based Key Encapsulation Mechanism) in FIPS 203, Kyber enables two parties to establish a shared secret key resistant to quantum computer attacks.

Technical Explanation

Kyber's security derives from the Module Learning With Errors (MLWE) problem, a mathematical challenge believed intractable for both classical and quantum computers. The algorithm uses structured lattices to create public-private key pairs where the public key can encapsulate a secret, but only the private key holder can decapsulate it.

Kyber-512 provides approximately 128-bit security, Kyber-768 provides 192-bit security, and Kyber-1024 provides 256-bit security. Key sizes range from 800 bytes to 1,568 bytes for public keys, with ciphertexts between 768 and 1,568 bytes. Performance is excellent, with operations completing in microseconds on standard hardware.

SynX Relevance

SynX implements Kyber-768 as its primary key encapsulation mechanism, providing 192-bit post-quantum security for all key exchange operations. Wallet-to-network communications, transaction encryption, and secure channel establishment all utilize Kyber-768 to protect against harvest-now-decrypt-later attacks.

Frequently Asked Questions

Is Kyber the same as ML-KEM?: Yes, ML-KEM is the official NIST standardized name for Kyber as published in FIPS 203.
Why Kyber-768 instead of Kyber-1024?: Kyber-768 balances security and performance, providing 192-bit security with smaller keys and faster operations than Kyber-1024.
Can quantum computers break Kyber?: No known quantum algorithm efficiently solves the MLWE problem underlying Kyber.

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