| Date |
Page |
Link |
Update Description |
| 16 November 2019 |
|
|
Returned to updating this page after a hiatus. Several uploads:
- Diagram of Chaocipher wheels inserted at top of home page
- Color scan of chapter 21 ("Chaocipher")
from John F. Byrne's "Silent Years"
- Byrne's worksheet dated Monday, 5 July 1937 enciphering the first line of Exhibit #1
|
| 18 January 2013 |
Progress Report #21 |
x |
Updated the page to note that the Chaocipher article in Cryptologia can now be downloaded for free. |
| 27 April 2012 |
Progress Report #21 |
x |
Chaocipher paper published in Cryptologia, Patricia Byrne passes away at 92 |
| 7 April 2011 |
Information about Henry E. Langen |
x |
Henry E. Langen's complete notes and summary of all his dealings with John F. Byrne and Chaocipher. |
| 1 April 2011 |
Historical Correspondences |
x |
Added original Hitt-Byrne letter corresponding to the quotes brought in Silent Years, page 273. |
| 18 December 2010 |
Progress Report #20 |
x |
Mike Cowan submits a new paper: "Chaocipher: Solving Exhibits 1 and 4" |
| 19 November 2010 |
Progress Report #19 |
x |
Uploaded Jeff Calof's paper ""Silent Years" - Chapter 21 (Chaocipher) Examined: Analyzing Byrne’s Assertions". |
| 8 August 2010 |
Progress Report #18 |
x |
Uploaded a paper providing an in-depth analysis of Exhibit 1 found in Byrne's "Silent Years". |
| 2 July 2010 |
Progress Report #17 |
x |
Chaocipher revealed: the actual algorithm is described publicly for the first time. |
| 1 June 2010 |
Progress Report #16 |
x |
The National Cryptologic Museum Foundation (NCMF) acquires the Chaocipher machine and papers |
| 29 March 2010 |
Progress Report #15 |
x |
Initial uploading. |
| 18 December 2009 |
Progress Report #11 |
x |
Mike
Cowan correctly pointed out an error in the analysis that ruled out a
C98 MM2 model with steps of 1/1/2/4. The error and correction are
now noted on the page. The result that this model is ruled out
remains unchanged even after the corrections. |
| 20 November 2009 |
Information about Henry E. Langen |
x |
Two
articles from the American Cryptogram Association's periodical "The
Cryptogram": a biography when he became editor in 1952, and an obituary
in 1962. |
| 19 November 2009 |
List of pt/ct indentities in Exhibit 1 |
x |
Four intervals were not sorted by offset. |
| 31 October 2009 |
Progress Report #14 |
x |
Added Mike Cowan's opinion regarding the significance or insignificance of no intervals less than 9. |
| 30 October 2009 |
Progress Report #14 |
x |
|
| 24 October 2009 |
Historical Correspondences |
x |
Added link to 6 February 1957 letter from WFF to JFB |
| 23 October 2009 |
TCCH homepage |
x |
Added link to J. F. Byrne chronology |