Merge pull request #4076 from nymtech/feature/update-security-page

Update security disclosure process

SECURITY.md

@@ -1,8 +1,90 @@
 Critical bug or security issue 💥
 
-If you're here because you're trying to figure out how to notify us of a security issue, go to Discord or Matrix, and alert the core engineers:
+If you're here because you're trying to figure out how to notify us of a security issue, send us a PGP encrypted email to:
 
-    Jedrzej Stuczynski, discord: "Jedrzej | Nym#5666" , matrix: @jstuczyn:nymtech.chat
-    Mark Sinclair | discord: marknym#8088 , matrix: @mark:nymtech.chat
+```
+security@nymte.ch
+```
+
+Encrypted with our public key which is available below in plain text and also on keyservers:
+
+```
+pub   rsa4096 2023-10-30 [SC] [expire : 2026-10-29]
+      24B2592E801A5AAA8666C8BA7C3C727F05090550
+uid          [  ultime ] Security Nym Technologies <security@nymte.ch>
+sub   rsa4096 2023-10-30 [E] [expire : 2026-10-29]
+
+```
+
+The fingerprint of the key is on the second line above.
+
+If you need to chat __urgently__ to our team for a __critical__ security issue:
+
+go to Matrix, and alert the core engineers with a private direct message:
+
+    Jedrzej Stuczynski @jstuczyn:nymtech.chat
+    Mark Sinclair @mark:nymtech.chat
+    Raphaël Walther @raphael:nymtech.chat
 
 Please avoid opening public issues on GitHub that contain information about a potential security vulnerability as this makes it difficult to reduce the impact and harm of valid security issues.
+
+If you don't know what Matrix is, you can follow this documentation to create an account on this federation of instant messaging servers:
+
+[Matrix for Instant Messaging](https://matrix.org/docs/chat_basics/matrix-for-im/)
+
+
+
+```
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+=nqgX
+-----END PGP PUBLIC KEY BLOCK-----
+```