Synopsis Inscriptions have been discovered from Indus culture areas, belonging to the intervening centuries between the eclipse of this culture and the appearance of Asokan edicts. The author analyses them and shows a distinct continuity of evolution of the characters from Indus to Brahmi script in the lapse of 2000 BC to 500 BC. Phonetics of Brahmi characters have been successfully used by Professor B.B. Chakravorty as bridges to decipher Indus legends. Similarly, Dr. S.K. Rao has used the phonetics of a majority of Semitic characters similar in shape to the Indus pictograms and obtained the picture of a relevant logical pre-Vedic language on decipherment. The author has established that all Brahmi characters excepting three on four can be created by applying the principle of acrophony to the ancient Indo-Aryan language. The remaining letter were either created from Austric words or from other foreign languages, when trade contacts grew intensively around fourth-fifth century BC. Therefore, he concluded the source of both Brahmi and Semitic alphabets are the Indust character themselves.