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lottery-system

central lottery system and retailer terminal network: certified RNG and draws, terminal network, ticket validation, prize liability

IGT Aurora, Scientific Games, Intralot

SystemTechniques · 5Primitives · 37 lottery-system Device shadow state syncdistributed · medium: Desired vs reported device state documents with versions and delta reconciliationPrimary-backup replicationdistributed · medium: One node orders all writes and ships them to standbys; the acknowledgement rule (none, one, all) sets what a crash loses, and an external arbiter decides who takes over.›Hot-standby redundancyembedded · medium: A second, always-current controller shadows the primary and takes over within a few cycles of silence; epochs stop the old primary from fighting back.›Hardware security module (HSM)security · medium: A tamper-resistant device or service that generates keys, signs, decrypts and wraps with them internally, and releases a key only as ciphertext.›Tamper-evident audit logsecurity · medium: An append-only log whose Merkle root, signed per batch, lets anyone verify an entry is present and history was never rewritten, with log-size proofs.›Message sequence numbersdistributed · low: A per-stream counter on every message lets the receiver detect loss, duplicates and reordering, ack cheaply and resume after reconnect with "send from N".›Csprngsecurity · low: OS-backed cryptographically secure random numbers (getrandom), and when a fast PRNG is not enoughDual control approvalsecurity · low: Four-eyes / maker-checker approval with quorum policies for sensitive operationsBarcode symbologiesdata-structures · low: Encode/decode 1D and 2D barcodes (Code 128, DataMatrix, QR) with their error correctionDouble-entry ledgerfinance · low: Append-only journal of transactions whose postings sum to zero per currency; balances are derived, so money can only move, never appear or vanish.›Idempotency keysfinance · low: Client-chosen unique key per logical operation, stored with a request fingerprint and the final response, so retries replay the first result instead of acting twice.›Money representationfinance · low: Store money as integer minor units with an explicit currency exponent, compute in wider integers, and round once with a named rounding mode.›Reconciliationfinance · low: Match internal ledger records against bank and processor statements by reference, then amount and date window; every unmatched or mismatched item becomes an exception.›Commitment schemessecurity · low: Hash and Pedersen commitments: hide a value now, bind to it, reveal laterMessage authentication codes (HMAC,…security · low: A keyed short tag proving a message is unmodified and came from a key holder; pick HMAC, CMAC, KMAC or a one-time polynomial MAC by what primitive you already have.›Mutual TLSsecurity · low: TLS where the client also proves a certificate key, so every connection carries a verified, rotatable machine identity.›Group commitstorage · low: Let concurrent committers share one log write and fsync; throughput grows with concurrency while each commit still waits at most about two fsyncs.›Delta encodingcompression · low: Store differences between consecutive values instead of the values, turning sorted IDs, timestamps and counters into small numbers that pack into few bits.›Conditional writesdistributed · low: Put-if-absent / if-match compare-and-swap on objects or keys as a commit primitiveMqtt protocolnetworking · low: MQTT pub/sub: topics, QoS 0/1/2, retained messages, sessions and keepaliveLeasesdistributed · low: A lock that expires on its own: bounded-time ownership that survives crashes and partitions, given bounded clock drift and fencing tokens on writes.›+ 21 more primitives

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