Lattice-based cryptography introduces significant payload expansion. Use this calculator to model how NIST FIPS 203 (ML-KEM) and FIPS 204 (ML-DSA) handshakes traverse standard 1,500-byte TCP MTUs without causing packet fragmentation and sub-10ms authorization timeouts.
Hybrid X25519MLKEM768 with RFC 8879 certificate compression stays within standard 1,500-byte MTU boundaries, maintaining low latency on high-throughput ISO 8583 switches.
