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.
Girino Vey!
npub18l…hcfsz
2025-02-26 14:19:17
in reply to naddr1qq…ufgp
Author Public Key
npub18lav8fkgt8424rxamvk8qq4xuy9n8mltjtgztv2w44hc5tt9vets0hcfszPublished at
2025-02-26 14:19:17Event JSON
{
"id": "af1cbae7c5268b74a3bd9d3517649ed3f93cc737baf4b7d9bf6094d770030261",
"pubkey": "3ffac3a6c859eaaa8cdddb2c7002a6e10b33efeb92d025b14ead6f8a2d656657",
"created_at": 1740579557,
"kind": 1,
"tags": [
[
"e",
"e1135bf94cbcdfb86f95f636df0c65a6385b69d746a69e6d84dde2a27cc72612",
"",
"root"
],
[
"a",
"30023:3ffac3a6c859eaaa8cdddb2c7002a6e10b33efeb92d025b14ead6f8a2d656657:1740339299160",
"",
"root"
]
],
"content": "Yet another improvement to mitigate replay attacks:\nTo 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.\n\n**Implementation Steps:**\n\n1. **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).\n\n ```json\n \"tags\": [\n [\"expiration\", \"1600000000\"]\n ]\n ```\n\n\n2. **Relay Compliance:** Ensure that relays adhere to NIP-40 by dropping expired events and not forwarding them to clients.\n\nImplementing 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.",
"sig": "7e42b92318679a62a8359b8d4bbfc3a0d4cb7563edaf82f393cfaad38f95e3ba6aaeb7cbbf06354fe7b11a2f3116e6feb489787bacbd0117467411e6e3681dc6"
}