requirements just pick the default. </para> <para> The easiest way to tell
whether an existing key is a v4 key or a v3 (or v2) key is to look at the
fingerprint: Fingerprints of version 4 keys are the SHA-1 hash of some key
-matieral, so they are 40 hex digits, usually grouped in blocks of 4.
+material, so they are 40 hex digits, usually grouped in blocks of 4.
Fingerprints of older key format versions used MD5 and are generally shown in
blocks of 2 hex digits. For example if your fingerprint looks like
<literal>5B00 C96D 5D54 AEE1 206B AF84 DE7A AF6E 94C0 9C7F</literal>