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+---
+title: The search for the perfect ed25519 key
+description: Here's how you can embed your name in an SSH key
+date: 2024-12-11
+---
+
+# The search for the perfect ed25519 key
+
+Todo write intro to catch attention
+
+### Why care about an ed25519 key?
+
+Ed25519 is a cryptographic algorithm for generating
+a pair of keys, a public one that can be shared with anyone
+and a private one that is kept as a secret.
+
+### The ssh public key format
+
+If you have ever accessed a remote server it was most likely by
+ssh-ing into it.  
+You have also most likely had to copy paste something similar to this:
+
+```
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIBSSj+yfJLWEb+Df4r4603TOFAUBREYS43qQB+c9i9UW
+```
+
+Let's break it down
+
+- The first part `ssh-ed25519` is the algorithm type, other common algorithms are `ssh-rsa` and `ssh-ecdsa`
+- The second part is a base64-encoded binary format consiting of
+  - the length of the algorithm string, for ed25519 it's always 11 (4 bytes long)
+  - the algorithm type, for ed25519 it's always `ssh-ed25519` in binary (11 bytes long)
+  - the length of the key, 32 bytes for ed25519 (4 bytes long)
+  - the actual ed25519 key (32 bytes long)
+
+### Embedding a word in base64
+
+Base64 is a widely used format for writing binary in a compact and human readable way,
+it uses A-Z, a-z, 0-9, '/' and '+' adding up to 64 unique characters.
+
+It's possible to choose specific bytes in a way that when encoding it with base64
+it will form a word.
+
+For example, to encode "Kyren" in base64, we can use the following bytes  
+`00101011 00101010 01001110` or in hex `2b 2a de`