“This telegram must be closely paraphrased before being communicated to anyone”
It appears that it was US military communications doctrine to not send the exact same message twice using different encryption ("none" counting as one type of encryption), and the term of art for changing a message to avoid that was indeed "paraphrase". I managed to dig up a US Army document on Cryptology from roughly that era that appears to discuss paraphrasing. The document in question is Department of the Army Technical Manual TM 32-220(pdf), dated 1950, titled "BASIC CRYPTOGRAPHY". It appa