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Breakthrough verification: - Python computed keys match server actual keys EXACTLY - Key derivation formula: HASH(K || H || X || session_id) verified - All keys (encryption, MAC, IV) derived correctly - Shared secret encoding (little-endian bytes) correct Remaining issue: - MAC verification fails despite correct key derivation - Client must be computing different keys than server - Need to compare client vs server actual key values Next step: Wireshark comparison of OpenSSH client keys