We are offering a reward of $1000 to the first person who can break the encryption algorithm. In order to obtain this reward you must a) provide the plaintext of the enclosed encrypted file semitest\secret\secret.txt and b) provide a description of the cryptanalysis.

$500 reward will be provided to the first person who suggests a plausible cryptanalysis. Cryptanalytic papers must include a clearly written summary in plain English. Please submit your results to info@casres.com.
 
 

click on "DOWNLOAD NOW!"
click on "BUY IT" next to "free ... 95/98/NT"
click on "PLACE SECURE ORDER"
select your country
click "SUBMIT"
fill the form (content unimportant)
click "SUBMIT"
click on "Download with HTTP"
click on "BEGIN HTTP DOWNLOAD"
select "Save this program on  disk"
click "OK"
browse to a directory
click "OK"
wait for file to download
click "OK" in the "download complete" window
cd to the directory you have selected
double-click on semizip.exe
cd to semitest\execable
break the cipher
claim your prize
 

The syntax for executing SemiTest.exe is: SemiTest <filename1> <filename2>

Example. In a DOS window type the following:
1) SemiTest plain.txt cipher.txt
2) SemiTest cipher.txt newplain.txt
3) fc plain.txt newplain.txt
plain.txt and newplain.txt should be the same.

SemiTest obtains its key from the file key.txt. The key consists of four 32-bit hexadecimal numbers.  If you edit key.txt and type:
SemiTest cipher.txt newplain.txt
cf plain.txt newplain.txt
then plain.txt and newplain.txt will not be the same.
 

Note: SemiTest is not compatible with DataSafe. Since Semiramis is a stream cipher DataSafe changes the key every time you encrypt a file even though the password you type stays the same. SemiTest is meant strictly for evaluation and reseach purposes.