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- !Coder 2.10 (01-Dec-90)
- =======================
- A file coder
- ============
- After loading,click on the !Coder icon on the icon bar,a window will appear.
- Drag the file to be coded onto this window,set the options (below) and click
- on "Go" to start the encryption.The same process will uncode the file.
-
- Coding techniques
- =================
- 1) Byte EORing
- This will exclusive-OR (EOR) every byte in the file with the byte given.By
- clicking on the white box next to "Byte:",you can enter a new encryption
- value,it must be between 0 and 255 and entered in decimal.
-
- 2) Word EORing
- This will exclusive-OR (EOR) every word in the file with the word given.By
- clicking on the white box next to "Word&",you can enter a new encryption
- value,it must be entered in hexadecimal and be between 0 and FFFFFFFF.
-
- 3) Text EORing
- This will exclusive-OR (EOR) the file with the text given.By clicking on the
- white box next to "Text:",you can enter a new encryption value.
-
- 4) Bit Reverse
- This will reverse the bits in every byte in the file.It MUST be used on its
- own,using it with any other option will PERMANENTLY CORRUPT the file.
-
- 5) Double text
- This allows two texts to be given,and the file EORed with both.This stops a
- problem with a single text given below.
-
- Options 1-3 and 5 may be used in combination with each other.Option 4 cannot
- be used with any other option.
-
- !Coder starts off with 24k of memory.It needs to grab more to encode large
- files so make sure there is enough before starting.
-
- Limitations
- ===========
- Option 3 (text eoring) is often not enough for a file.For example,should you
- use the word "AMFSOFT".Take this example of text:
- "***** *****" (the stars stand for any character)
-
- This becomes:
-
- "#####mfsoftamfsoftamfs#####"
-
- as the spaces turn upper case text into lower case,so it is readable.
-
- Addresses
- =========
- Comments,suggestions,bug reports (I hope not) and any donations you wish to
- make to:
-
- AMFsoft
- 50 Burlington Way
- Mickleover
- Derby
- DE3 5BD