Gemma4 Anti Cheat 的修订

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Gemma4-AC.md

			@@ -240,7 +240,7 @@ Module Security.IsolateShard {
240	240		\| Over-Damage \| Heuristic Validation \| `Plausibility Check` (Max DPS limit) \|
241	241		\| Impersonation \| Identity Layer \| `mTLS` / `Cryptographic Signing` \|
242	242		\| Replay Attack \| Sequence Tracking \| `Sequence Nonces` \|
243		-	\| Slow-Drip Cheat \| Probabilistic Audit \| `Sampling` $\rightarrow$ `Proof of Work` \|
244		-	\| Compromised Node \| Circuit Breaking \| `IsolateShard` $\rightarrow$ `Saga Rollback` \|
	243	+	\| Slow-Drip Cheat \| Probabilistic Audit \| `Sampling` > `Proof of Work` \|
	244	+	\| Compromised Node \| Circuit Breaking \| `IsolateShard` > `Saga Rollback` \|
245	245
246	246		By combining low-cost heuristics (for every packet) with high-cost audits (for 1% of packets), the system maintains the performance of the Delta-Sync model while ensuring that the "cost of cheating" is a high probability of being caught and wiped from the game.

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		@@ -0,0 +1,246 @@
1	+	In a distributed Delta-Synchronization model, you have essentially moved the "trust" from the individual player to the Server Shard. However, in a high-stakes environment, you cannot trust the shard blindly (as it could be compromised) or you might have "ghost" shards sending fraudulent data.
2	+
3	+	To handle this, the DSL must implement a Zero-Trust Validation Layer between the Shard and the Global Authority. Instead of a simple "Accept Delta" function, we introduce Sanity Ceilings, Audit Sampling, and AI Anomaly Detection.
4	+
5	+	Here is how the DSL handles anti-cheat and validation:
6	+
7	+	### 1. The "Sanity Ceiling" (Deterministic Validation)
8	+	The most basic defense is to calculate the Theoretical Maximum Damage (TMD). The Global Authority knows how many players are on a shard and the maximum possible DPS (Damage Per Second) a player can achieve.
9	+
10	+	* The Logic: If `Delta > (Max_DPS * Player_Count * Tick_Interval)`, the delta is flagged as fraudulent.
11	+
12	+	```python
13	+	# --- ADDITION TO GLOBAL AUTHORITY ---
14	+	Module GlobalAuthority {
15	+	ApplyDamage /execute {
16	+	# 1. Sanity Check: Compare delta against theoretical max
17	+	$max_allowed = Shard.PlayerCount * GlobalConfig.Max_DPS * 0.1 # 100ms tick
18	+
19	+	if ({delta} > $max_allowed) {
20	+	# Flag as suspicious and trigger the Audit flow
21	+	Call Audit.VerifyDelta { shard: $shard_id, delta: $delta }
22	+	# We temporarily reject the delta or cap it at the max_allowed
23	+	$final_delta = $max_allowed
24	+	} else {
25	+	$final_delta = {delta}
26	+	}
27	+
28	+	GlobalState.HP -= $final_delta
29	+	}
30	+	}
31	+	```
32	+
33	+	---
34	+
35	+	### 2. The "Audit Sample" (Probabilistic Validation)
36	+	Because calculating a hard ceiling is often too rigid (e.g., a player might get a "critical hit" that spikes damage), we use Audit Sampling. The Global Authority occasionally demands a "Proof of Work."
37	+
38	+	* The Logic: The Global Authority randomly selects a percentage of deltas and asks the shard to provide the Hit-Log (the specific list of attacks) that generated that delta.
39	+
40	+	```python
41	+	Module Audit {
42	+	VerifyDelta /execute {
43	+	# Request a sample of the hits from the shard's local log
44	+	Call Shard.GetHitLog { sample_size: "10%" } -> $sample_log
45	+
46	+	# Validate the sample: Sum(sample_hits) == (Delta * 0.1)
47	+	if (Sum($sample_log) != {delta} * 0.1) {
48	+	# Fraud detected: The shard is lying about its totals
49	+	Saga.QuarantineShard { shard_id: $shard_id }
50	+	}
51	+	}
52	+	}
53	+	```
54	+
55	+	---
56	+
57	+	### 3. The "AI Watchdog" (Behavioral Analysis)
58	+	While the Sanity Ceiling catches "obvious" cheats (e.g., 1 billion damage), a sophisticated cheater will stay just under the ceiling. To catch these, we use the AI Director to perform Cross-Shard Comparison.
59	+
60	+	* The Logic: The AI compares the performance of all shards. If Shard A is consistently producing 30% more damage than Shard B, C, and D, despite having the same player composition and gear levels, it flags a Behavioral Anomaly.
61	+
62	+	```python
63	+	Module AIWatchdog {
64	+	Tick [10s] {
65	+	# AI analyzes the delta trends across all shards
66	+	AI.Analyze {
67	+	data: GlobalState.ShardDeltas,
68	+	metric: "StandardDeviation",
69	+	threshold: 2.0 # Flag shards 2 standard deviations above mean
70	+	} -> $outliers
71	+
72	+	if ($outliers.count > 0) {
73	+	# Trigger a deeper audit or a "shadow-nerf" on the suspicious shard
74	+	foreach ($outlier in $outliers) {
75	+	Call Audit.DeepScan { shard: $outlier }
76	+	}
77	+	}
78	+	}
79	+	}
80	+	```
81	+
82	+	---
83	+
84	+	### 4. The "Punishment" Saga (Handling the Fraud)
85	+	When fraud is detected, you cannot simply crash the shard, as that would disconnect thousands of innocent players. Instead, you trigger a Corrective Saga.
86	+
87	+	```python
88	+	Module AntiCheatSaga {
89	+	QuarantineShard /execute {
90	+	# 1. Mark the shard as 'Untrusted' in the Global State
91	+	$global_boss_state.untrusted_shards.add($shard_id)
92	+
93	+	# 2. Apply a 'Penalty Multiplier' to all future deltas from this shard
94	+	# Instead of rejecting, we reduce their damage by 90% to nullify the cheat
95	+	GlobalAuthority.SetMultiplier { shard_id: $shard_id, factor: 0.1 }
96	+
97	+	# 3. Notify the Admins
98	+	Notification.AlertAdmin("Suspected cheat on Shard $shard_id. Applied penalty multiplier.")
99	+
100	+	# 4. Log the event for a later ban-wave
101	+	EXT:DB.LogInfraction { shard: $shard_id, type: "DeltaFraud" }
102	+	}
103	+	}
104	+	```
105	+
106	+	### Summary of the Validation Architecture
107	+
108	+	\| Threat \| Defense Mechanism \| DSL Implementation \| Result \|
109	+	\| :--- \| :--- \| :--- \| :--- \|
110	+	\| The "One-Hit Kill" \| Sanity Ceiling \| `if (delta > max)` \| Immediate rejection of impossible values. \|
111	+	\| The "Subtle Buffer" \| Audit Sampling \| `Sump(Sample) == Delta %` \| High probability of detection over time. \|
112	+	\| The "Pro-Cheater" \| AI Watchdog \| `AI.Analyze(StandardDev)` \| Detection of statistical anomalies. \|
113	+	\| Compromised Shard \| Quarantine Saga \| `Saga.Quarantine` \| Neutralizes the threat without kicking innocent players. \|
114	+
115	+	By combining Deterministic Checks (Ceilings), Probabilistic Checks (Sampling), and Heuristic Checks (AI), the DSL creates a "Defense in Depth" strategy. The system accepts that no single check is perfect, but the combination makes cheating mathematically improbable and highly visible.
116	+
117	+	This is the critical "Security vs. Performance" trade-off. By moving the calculation to the shards (distributed) and only sending the result to the Authority, you have created a Trust Gap. If a shard is compromised, it can simply send a delta of `-999,999,999` and kill the boss instantly.
118	+
119	+	To prevent this, the DSL must implement Multi-Layered Validation. We don't just trust the number; we verify the Plausibility, the Identity, and the Proof.
120	+
121	+	Here is how the DSL handles anti-cheat for distributed deltas.
122	+
123	+	---
124	+
125	+	### 1. The "Sanity Gate" (Heuristic Validation)
126	+	The first line of defense is a Plausibility Filter on the Global Authority. The Authority knows the maximum possible damage a single shard could realistically produce in 100ms.
127	+
128	+	* The Logic: $\text{Max Damage} = (\text{Max Players per Shard}) \times (\text{Max DPS per Player}) \times (\text{Tick Interval})$.
129	+	* If a delta exceeds this threshold, it is flagged immediately.
130	+
131	+	```python
132	+	# --- GLOBAL AUTHORITY: VALIDATION LAYER ---
133	+	Module GlobalAuthority {
134	+	ApplyDamage /execute {
135	+	# 1. Plausibility Check
136	+	if ({delta} > $MAX_POSSIBLE_SHARD_DPS) {
137	+	# Trigger a Security Event
138	+	Call Security.FlagSuspiciousActivity {
139	+	shard: {shard_id},
140	+	value: {delta},
141	+	reason: "Damage exceeds theoretical limit"
142	+	}
143	+	# Reject the update or clamp it to the max
144	+	{delta} = $MAX_POSSIBLE_SHARD_DPS
145	+	}
146	+
147	+	# Proceed with atomic update
148	+	GlobalState.HP -= {delta}
149	+	}
150	+	}
151	+	```
152	+
153	+	---
154	+
155	+	### 2. The "Proof of Work" (Sampling & Auditing)
156	+	Since checking every single hit is too expensive, the DSL uses Probabilistic Auditing. The Global Authority occasionally demands a "Receipt" for a delta.
157	+
158	+	* The Process: The Authority sends a challenge: "You just sent 50,000 damage. Send me the list of the top 10 hits and the player IDs that generated them."
159	+	* If the shard cannot provide the proof, or the proof is forged, the shard is marked as compromised.
160	+
161	+	```python
162	+	# --- SECURITY MODULE: AUDIT TRAIL ---
163	+	Module Security {
164	+	AuditShard /execute {
165	+	# Randomly select 1% of updates for deep verification
166	+	if (Random.Value() < 0.01) {
167	+	# Request detailed logs from the shard
168	+	Request.AuditLog { shard_id: {shard_id}, delta: {delta} }
169	+	-> Audit.Verify
170	+	}
171	+	}
172	+
173	+	Audit.Verify /check ? [
174	+	valid -> Audit.Pass,
175	+	invalid -> Security.IsolateShard { shard_id: {shard_id} }
176	+	]
177	+	}
178	+	```
179	+
180	+	---
181	+
182	+	### 3. Cryptographic Identity (Preventing Spoofing)
183	+	To prevent a malicious actor from pretending to be a shard, we use Mutual TLS (mTLS) and Sequence Nonces.
184	+
185	+	* Identity: Every shard has a unique cryptographic certificate. The Global Authority only accepts requests signed by a valid certificate.
186	+	* Sequence Numbers: Every delta includes a monotonically increasing `SequenceID`. If the Authority receives `Seq: 10` followed by `Seq: 10` again, it knows it's a Replay Attack (someone captured a valid packet and is sending it repeatedly).
187	+
188	+	```python
189	+	# --- SHARD-SIDE SECURITY ---
190	+	Module ShardSecurity {
191	+	ApplyDamage /execute {
192	+	# Attach cryptographic signature and sequence number
193	+	payload = {
194	+	delta: {delta},
195	+	seq: $my_sequence_number++,
196	+	sig: Crypto.Sign($my_private_key, {delta})
197	+	}
198	+	Call GlobalAuthority.ApplyDamage { data: payload }
199	+	}
200	+	}
201	+	```
202	+
203	+	---
204	+
205	+	### 4. The "Isolation" Pattern (Circuit Breaking)
206	+	When a shard is flagged as fraudulent, we don't just ignore the packet; we use a Circuit Breaker to isolate the shard and protect the rest of the world state.
207	+
208	+	* The "Quarantine" State: The shard is moved to a `Quarantined` state.
209	+	* Saga Recovery: A Saga is triggered to:
210	+	1. Disconnect all players from the compromised shard.
211	+	2. Migrate those players to a "Clean" shard.
212	+	3. Revert any damage contributed by that shard since the last known "Clean" checkpoint.
213	+
214	+	```python
215	+	# --- SECURITY: SHARD ISOLATION SAGA ---
216	+	Module Security.IsolateShard {
217	+	# 1. Immediate Cut-off
218	+	EXT:LoadBalancer.RemoveShard { shard_id: {shard_id} }
219	+
220	+	# 2. Player Migration
221	+	EXT:PlayerManager.MigrateAll { from: {shard_id}, to: "Clean_Shard_Pool" }
222	+
223	+	# 3. State Rollback
224	+	# Use the Event Log to find all deltas from this shard since the last Audit.Pass
225	+	Saga.RollbackDeltas {
226	+	target: $global_boss_state,
227	+	source: {shard_id},
228	+	since: $last_audit_timestamp
229	+	}
230	+
231	+	# 4. Alert Ops
232	+	Notify.Admin("ALERT: Shard {shard_id} isolated due to fraudulent data.")
233	+	}
234	+	```
235	+
236	+	### Summary of the Anti-Cheat Architecture
237	+
238	+	\| Attack Vector \| Defense Mechanism \| DSL Implementation \|
239	+	\| :--- \| :--- \| :--- \|
240	+	\| Over-Damage \| Heuristic Validation \| `Plausibility Check` (Max DPS limit) \|
241	+	\| Impersonation \| Identity Layer \| `mTLS` / `Cryptographic Signing` \|
242	+	\| Replay Attack \| Sequence Tracking \| `Sequence Nonces` \|
243	+	\| Slow-Drip Cheat \| Probabilistic Audit \| `Sampling` $\rightarrow$ `Proof of Work` \|
244	+	\| Compromised Node \| Circuit Breaking \| `IsolateShard` $\rightarrow$ `Saga Rollback` \|
245	+
246	+	By combining low-cost heuristics (for every packet) with high-cost audits (for 1% of packets), the system maintains the performance of the Delta-Sync model while ensuring that the "cost of cheating" is a high probability of being caught and wiped from the game.