diff --git a/kishib.py b/kishib.py
index 170c189..f60d57c 100644
--- a/kishib.py
+++ b/kishib.py
@@ -110,8 +110,8 @@ def auth_hash(client_pubkey, server_pubkey):
 	server_pubkey_hash = sha512(enc_len(len(server_pubkey)) + server_pubkey)
 	combined_hash = sha512(client_pubkey_hash + server_pubkey_hash)
 
-	truncated_hash = combined_hash[:32]
-	hash_check = sha512(truncated_hash)[:5]
+	truncated_hash = combined_hash[:16]
+	hash_check = sha512(truncated_hash)[:4]
 	return truncated_hash + hash_check
 
 def chunk(sliceable, length):
@@ -120,7 +120,7 @@ def chunk(sliceable, length):
 
 def format_hash(hash_bytes):
 	hash_base32 = base64.b32encode(hash_bytes).decode().lower().replace('=', '')
-	chunked_base32 = chunk(hash_base32, 5)
+	chunked_base32 = chunk(hash_base32, 4)
 	return '-'.join(chunked_base32)
 
 def verify(client_pubkey, server_pubkey):