The numbers that Major Tallmadge assigned to members of the Culper Ring were from a secret writing system he invented. He substituted digits for words that would be used in messages. "Long Island," for example, was 728, "arms" was 7, and "city" was 88. There was a number for each month, such as 34l for "January." He made four copies of his codes. He kept one and gave the others to Woodhull, Townsend, and General Washington. For words that did not have a number code, Tallmadge gave his agents a cipher. In a cipher, each letter in a message is replaced by another letter or a number.

Which best describes the central idea of this excerpt?

Major Tallmadge created a code that substituted numbers for words during the Revolutionary War.
Major Tallmadge created a code in which “city” was “88” during the Revolutionary War.
During the Revolutionary War, Major Tallmadge gave General Washington the key to his codes.
During the Revolutionary War, Major Tallmadge gave soldiers a cipher for words not included in the code.

During the Revolutionary War, Major Tallmadge gave soldiers a cipher for words not included in the code is the best describes the central idea of this excerpt. Hence, option D is correct.

What is the concept of the passage?

The Culper Ring used top-secret writing that Major Tallmadge had provided to them, according to this paragraph from Tools of the Spymaster. He substituted words for numbers for each month of the year and made special allowances for odd numbers.

The statement best summarizes the primary idea of the extract, since he had the ability to produce more machines a secret writing system, which he devised, but decided to make only four. General Washington, Woodhull, and Townsend each received three of the four copies of the code that he printed.

Thus, option D is correct.

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