Because there is a special padding character '='
Base64 Is Base65
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Re: Base64 Is Base65
#2The padding character is not required for the underlying encoding scheme to function in isolation. It becomes more useful when you have a stream of multiple, un-delimited base64 values that need to be processed.
Re: Base64 Is Base65
#3'=' is not part of the payload. It belongs to the carrier protocol to signal end of payload.