BP’s Notes on the Enigma Uhr by Sir Stuart Milner-Barry et al. Introduction These notes describes Bletchley Park’s (BP) discovery of the Enigma Uhr, an attachment for the German cipher machine Enigma. The notes have been found among the reports that US Army Captain Walter J. Fried wrote while he was at BP on liaison duty. The notes that are presented here are parts of the Fried Reports F-62, F-64, and F-112. The first two pages have been written by Captain Fried while the others have been compiled by the BP cryptographer Sir Stuart Milner-Barry. The last page is signed M.A.C. Who hides behind this signature is not known. It is most likely somebody from Hut 6. Two persons with the initials M. C. are known. They are Mac Chamberlain and Mary Cropper. If any of them had a middle name starting with A is not known. In 1943, while at BP, Mary Cropper married another Hut 6 person, Sir Howard Smith, who later became Director-General of MI5. Source: NR. 2612, Box 880, Walter J. Fried’s Reports from BP, NARA, RG 457, NSA Historical Collection Editor: Frode Weierud

BP's Notes on the Enigma Uhr - Frode Weierud’s …cryptocellar.org/Enigma/BPEnigmaUhr.pdfBP’s Notes on the Enigma Uhr by Sir Stuart Milner-Barry et al. Introduction These notes

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BP’s Notes on the Enigma Uhr

Sir Stuart Milner-Barry et al.

Introduction

These notes describes Bletchley Park’s (BP) discovery of the Enigma Uhr, an attachment for the German cipher machine Enigma. The notes have been found among the reports that US Army Captain Walter J. Fried wrote while he was at BP on liaison duty. The notes that are presented here are parts of the Fried Reports F-62, F-64, and F-112. The first two pages have been written by Captain Fried while the others have been compiled by the BP cryptographer Sir Stuart Milner-Barry. The last page is signed M.A.C. Who hides behind this signature is not known. It is most likely somebody from Hut 6. Two persons with the initials M. C. are known. They are Mac Chamberlain and Mary Cropper. If any of them had a middle name starting with A is not known. In 1943, while at BP, Mary Cropper married another Hut 6 person, Sir Howard Smith, who later became Director-General of MI5.

Source: NR. 2612, Box 880, Walter J. Fried’s Reports from BP, NARA, RG 457, NSA Historical Collection

Editor: Frode Weierud