GUID in 20 ASCII characters

Coding Horror: Equipping our ASCII Armor:

A GUID is 128 bits, or 16 bytes.

A Hex encoded GUID... uses ASCII values 0-9, A-F and results in a 32 byte string:

22da5537-de54-459d-9b33-f40f2101143b

An ASCII85 encoded GUID..... uses ASCII values 33-118 (decimal) and results in a 20 byte string:

[Rb*hlkkXVW+q4s(YSF0