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1. In radio communications, one of the three major subdivisions of a message, namely the heading, the text, or the ending. Note: Each message part may have separate components and each component may have elements and contents. 2. In cryptosystems, text that results from the division of a long message into several shorter messages of different lengths as a transmission security measure. Note: Message parts are usually prepared in such a manner as to appear unrelated externally. Statements that identify the parts for assembly at reception are encrypted in the texts. [From Weik '89]