Security

Entropy Calculator

Measure the randomness of any data — Shannon entropy (bits/symbol), Min-Entropy (worst-case guess work), alphabet size, duplicate rate, and an average brute-force cracking time at a chosen hash rate. Rates data as Strong (≥128-bit min-entropy), Medium (64-127), or Weak (<64).

html· HTML resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/entropy-calculator' \
  -H 'Content-Type: application/json' \
  -d '{"data":"password123","mode":"character","guessRate":"1e10","customGuessRate":10000000000000}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/entropy-calculator

Parameters

Name	Type	Required	Description
data	textarea	Yes	—
mode	select	No	—
guessRate	select	No	—
customGuessRate	number	No	—

Response format

HTML result

JSON

{
  "result": "<div>Processed HTML content</div>",
  "error": "Error message (optional)",
  "message": "Notification message (optional)",
  "metadata": {
    "key": "value"
  }
}

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-entropy-calculator": {
      "name": "entropy-calculator",
      "description": "Measure the randomness of any data — Shannon entropy (bits/symbol), Min-Entropy (worst-case guess work), alphabet size, duplicate rate, and an average brute-force cracking time at a chosen hash rate. Rates data as Strong (≥128-bit min-entropy), Medium (64-127), or Weak (<64).",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=entropy-calculator",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "entropy-calculator",
    "arguments": {
  "data": "password123",
  "mode": "character",
  "guessRate": "1e10",
  "customGuessRate": 10000000000000
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

Questions or issues? Contact [email protected]

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Entropy Calculator

html· HTML resultOpen tool

curl -X POST 'https://api.elysiatools.com/en/api/tools/entropy-calculator' \ -H 'Content-Type: application/json' \ -d '{"data":"password123","mode":"character","guessRate":"1e10","customGuessRate":10000000000000}'

Name

Type

Required

Description

data

textarea

Yes

—

mode

select

—

guessRate

select

—

customGuessRate

number

—

{ "mcpServers": { "elysiatools-entropy-calculator": { "name": "entropy-calculator", "description": "Measure the randomness of any data — Shannon entropy (bits/symbol), Min-Entropy (worst-case guess work), alphabet size, duplicate rate, and an average brute-force cracking time at a chosen hash rate. Rates data as Strong (≥128-bit min-entropy), Medium (64-127), or Weak (<64).", "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=entropy-calculator", "command": "", "args": [], "env": {}, "isActive": true, "type": "sse" } } }

{ "jsonrpc": "2.0", "id": 2, "method": "tools/call", "params": { "name": "entropy-calculator", "arguments": { "data": "password123", "mode": "character", "guessRate": "1e10", "customGuessRate": 10000000000000 } } }