Posts tagged compute_amp.
Casper P2P TLS-1.3 P-521 pre-auth ECDSA verify burn
An unauthenticated peer can force a Casper node to run a full P-521 ECDSA signature verification during TLS-1.3 handshake — before any admission gate, allowlist, or per-peer cap — burning crypto-CPU via fresh-cert-per-connection churn.
Burning go-ethereum RPC CPU with one eth_call to the BLAKE2F precompile
A single unauthenticated eth_call invoking the BLAKE2F precompile with a caller-set rounds field pins a go-ethereum RPC worker's CPU for hundreds of milliseconds from a sub-kilobyte request.
Qtum BIP-324 Pre-Authentication ECDH CPU Exhaustion
Qtum's BIP-324 v2 transport runs a pre-authentication ellswift-ECDH on every inbound connection, allowing a single source IP to saturate a core and deny honest peers.
How an exposed debug_traceCall lets one unauthenticated request burn seconds of go-ethereum CPU
debug_traceCall re-runs an eth_call-style message opcode-by-opcode with a full EVM tracer attached, so a single small request converts into up to seconds of single-goroutine CPU on the target — and with no per-source rate or concurrency cap, an unauthenticated caller drives many such traces in parallel against an exposed go-ethereum node.