-
@ Girino Vey!
2025-02-26 14:19:17
Yet another improvement to mitigate replay attacks:
To mitigate replay attacks, it's advisable to assign short expiration times to all gift-wrapped events. According to NIP-40, the `expiration` tag allows events to specify a Unix timestamp after which they should be considered expired and potentially deleted by relays. By setting this expiration to less than 5 minutes, intercepted events become invalid shortly after creation, reducing the risk of replay attacks.
**Implementation Steps:**
1. **Assign Expiration Tag:** When creating a gift-wrapped event, include the `expiration` tag with a timestamp set to the current time plus a few minutes (e.g., 5 minutes).
```json
"tags": [
["expiration", "1600000000"]
]
```
2. **Relay Compliance:** Ensure that relays adhere to NIP-40 by dropping expired events and not forwarding them to clients.
Implementing short-lived expiration times enhances security by ensuring that even if an event is intercepted, its usability window is minimal, thereby mitigating the potential for replay attacks.