I want to say this looks interesting but it's so sparse on details it's hard to say. What modifications were made to base64? Is the only modification replacing "+" with "."? Is the rest of the table[1] unchanged? Can it be extended to only use URL-safe characters (like base64url)? How does this compare to other popular/optimized implementations of standard base64? What are its performance characteristics on different sizes of inputs? I've never had to decode 100 MB of base64 data, but I have had to decode a ton of 64-bit base64 strings, for example.