Clarification of ephemeral identifier type definition #5
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Clarified the definition of the ephemeral subject identifier to emphasize non-reusability and the need for sufficient entropy in response values.
Clarify the definition of ephemeral identifier and add requirements for its usage.
fredericoschardong
suggested changes
Jan 14, 2026
| To make it not possible for Clients to correlate the End-User's multiple visits, an OP | ||
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| 1. MUST NOT reuse an ephemeral identifier value; | ||
| 2. MUST generate the value with a guessing probability of 2^128^ or less; and |
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| 2. MUST generate the value with a guessing probability of 2^128^ or less; and | |
| 2. MUST generate the value with a guessing probability of 2^-128^ or less; and |
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| 1. MUST NOT reuse an ephemeral identifier value; | ||
| 2. MUST generate the value with a guessing probability of 2^128^ or less; and | ||
| 3. SHOULD target 2^160^ or less. |
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| 3. SHOULD target 2^160^ or less. | |
| 3. SHOULD target 2^-160^ or less. |
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