Base$64$ encoding allows arbitrary sequences of octets to be represented by printable characters. The encoding process represents $24-$bit groups of input bits as strings of four encoded characters. The $24-$bit groups are formed by concatenating three octets. These $24-$bit groups are then treated as four concatenated $6-$bit groups, each of which is translated to a character of the Base$64$ alphabet. The encoded output stream is represented by lines of no more than $76$ printable characters, with line breaks being indicated by the $$CR$,$ LF$$ character sequence.