aes_encrypt

THE RISK

Low Risk

Why aes_encrypt needs a policy

AES encryption is a data transformation operation that converts plaintext into ciphertext. It does not read from a data store, write/modify persistent data, execute code, destroy data, or involve financial transactions. It is a local cryptographic utility. The closest category is 'Other' since it is a pure transformation function.

From the tool's definition 'encrypt text with aes' — the tool performs AES encryption of data, which is a local cryptographic transformation with no side effects, data deletion, financial movement, or external execution.

Documented attack patterns abuse exactly the kind of access aes_encrypt gives an agent:

POLICY

How to control aes_encrypt

PolicyLayer is an MCP gateway — it sits between your AI agents and Crypto_MCP, and nothing reaches the server without passing your rules. This is the rule we recommend for aes_encrypt:

policy.json

{
  "version": "1",
  "default": "deny",
  "tools": {
    "aes_encrypt": {
      "limits": [
        {
          "counter": "aes_encrypt_rate",
          "window": "minute",
          "max": 60,
          "scope": "grant"
        }
      ]
    }
  }
}

aes_encrypt gets a rate cap, and everything else on the server is denied unless you say otherwise.

Create a free account and register Crypto_MCP — nothing to install.
Add this policy — paste it, or build it visually.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

SET A RULE FOR THIS TOOL →

Free to start. No card required.

EXPLORE

Related tools and policies

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All 14 Crypto_MCP tools →

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Go deeper

The MCP Attack Database → Documented attack patterns against MCP deployments — and the policies that stop them.
Tool risk categories → How PolicyLayer classifies MCP tools by what they can do.
MCP tool → What an MCP tool is and how clients discover and call it.
Rate Limiting MCP Tool Calls: A Practical Guide →
MCP Security: Why Prompt Guardrails Aren't Enough →

FAQ

Questions about aes_encrypt

What does the aes_encrypt tool do? +

encrypt text with aes. It is categorised as a Other tool in the Crypto_MCP MCP Server, which means it performs auxiliary operations.

How do I enforce a policy on aes_encrypt? +

Register the Crypto_ MCP server in PolicyLayer and add a rule for aes_encrypt: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Crypto_MCP. Nothing to install.

What risk level is aes_encrypt? +

aes_encrypt is a Other tool with low risk. Read-only tools are generally safe to allow by default.

Can I rate-limit aes_encrypt? +

Yes. Add a rate_limit block to the aes_encrypt rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.

How do I block aes_encrypt completely? +

Set action: deny in the PolicyLayer policy for aes_encrypt. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.

What MCP server provides aes_encrypt? +

aes_encrypt is provided by the Crypto_ MCP server (1595901624/crypto-mcp). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.

Enforce policy on every Crypto_MCP tool call.

Start from Crypto_MCP, add the rest of your stack, and see everything your agents can call. Then put policy on all of it.

CHECK YOUR STACK →