Lorenz SZ 40 style enciphering v5.0
The most convenient way to use this cipher
process is that of copy & paste. Virtually all Windows applications
support copy & paste. Consequently any means of creating cleartext
can be used e.g. Notepad, Word, Outlook, Excel. Alternatively, text displayed by
Windows applications can be used e.g. MSIE, Adobe Acrobat Reader.
technique is to position the mouse cursor immediately to the left of the first character, click
& hold the right mouse button and drag the mouse until the last
character of the text is highlighted, then release the mouse button. Copy the
highlighted text to the copy & paste buffer by holding down the
control (Ctrl) key and pressing the C key, then release the control key. Click
on the "Cleartext" area (above) and, with the text cursor flashing,
paste the text into the area by holding down the control (Ctrl) key and pressing
the V key, then release the control key. Once the ciphertext has been
generated copy & paste can be used to insert it into the body of an
email, for example. This way encrypted messages can be passed and only those who
know the wheel settings for the message will be able to read it. Decryption of a
message involves copying and pasting the ciphertext into the
"Ciphertext" area, care is required to ensure that no spurious
characters preceding the ciphertext are copied.
there's a 1 in 372 chance of finding the chosen wheel setting; this is an
extremely trivial number considering the potential chance of reading a message
using this enciphering off-line, which is literally astronomical: it's the next
best thing to unbreakable i.e. what Bletchley Park Cryptoanalysis Jack Good and
Donald Michie referred to as the 'Motorless Tunny'.
To learn about the Lorenz SZ enciphering
machine and Tunny, click on the following link:- http://en.wikipedia.org/wiki/Lorenz_cipher
The wheels of the cipher machine must be set to a start position by
entering a 12 character string (use letters and numbers only) in the box,
and clicking on "Set wheels". It is important to remember your
string otherwise encrypted messages can't be decrypted. This page loads
with the string: AAAAAAAAAAAA preset, which can be used to see how it all
Have you click "Set wheels"?
Click inside the "Cleartext" area and the text cursor will flash
in the top-left corner, then type the message you want encrypted. Click
"Encrypt". The wheel positions will change during the encryption
process, and when it is finished the encrypted version of your message will
appear in the "Ciphertext" area.
Set the wheels using the preset string, or use couldbemagic
Type the following cleartext and click
This is a test message
its ciphertext is:-
using the preset string to set the wheels, or:-
Click inside the "Ciphertext" area and the text cursor will
flash in the top left-hand corner (click "Clear all" to clear the
area of any characters that may be displayed, beforehand). At this point ciphertext
may be entered manually. However, it is far easier to use copy and paste
for its entry - see "Use", opposite. As with encryption, the wheels must be
set to their starting position before clicking "Decrypt" - see
above for wheel setting.
Set the wheels according to the same 12 character string used for the
encryption. Either of the ciphertext given above can be pasted into
the "Ciphertext" area.
On clicking "Decrypt" the cleartext will be displayed, only if you have used the same wheel settings!. Alternatively,
set the wheels and click "Decrypt" to view the cleartext
for the ciphertext currently displayed.