{
  "name": "Multicast security",
  "order": 35,
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      "title": "Introduction to Multicast security and copyright protection",
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      "id": "59a5801209a6acac5983b312",
      "title": "Broadcast encryption",
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      "challengeSeed": [
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    {
      "id": "59a5801209a6acac5983b313",
      "title": "Improvement using Ramp Schemes",
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      "challengeSeed": [
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    {
      "id": "59a5801209a6acac5983b314",
      "title": "Multicast re-keying",
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    {
      "id": "59a5801209a6acac5983b316",
      "title": "The Naor-Pinkas Re-keying scheme",
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    {
      "id": "59a5801209a6acac5983b317",
      "title": "Logical key hierarchy",
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      "challengeSeed": [
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      "tests": [
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  ]
}