marumo

On Feb 8 15:00 GMT, I replaced the c2bf server machine. There is already no restriction. Please run your client unlimit. I cooperate in the mirror/faq site creation as much as possible.

well, so we can make the blocks like this?

right. but more simple, in the pseudo code.

// code, key, plaintext are 64bit unsigned integer
plaintext = 0x01c8be00131126d3;
for(ka=0xffffff;ka>=0xe00000;ka--){
  for(i=0;i<65536;i++){
    for(j=0;j<65536;j++){
      key = ka << 32;
      key |= i<<16;
      key |= j;
      code = c2_enc(plaintext, key);
      if(code == 0x02ee91c0f2fe44d1){ // cyphertext
         // jackpot!!
         save_current_key(key);
      }
    }
  }
}

for more detail, other "code=XXX" entries are generated by server in following code.

ka = 0xXXXXXX; // client recieve block;
kb = (rand() << 16) | rand();
code[0:6] = c2_enc(plaintext, (ka<<32)|kb);

clients program report all finding keys, and server check "reported key" and "used key". It's for rejecting invalid client.

I'm kazhiro@marumo.ne.jp, the webmaster of www.marumo.ne.jp

I read your mail and all posted message in this thread.

We have already modified the UNIX version of c2bf to run it on the 390/S IBM Mainframe. Right now we are doing a dump of the last 2 millions of packets ( FFFFFF and bellow) and this saturday we will beging the testing.

Thank you very match. This action gives me many help. Please use the following data. and prepare pre-calcurated test data for testing c2_enc() function.

plaintext=0x01c8be00131126d3
cyphertext=0x02ee91c0f2fe44d1
#other code=xxx entries in the c2bf.dat are dummy cyphertext for the client check.

As takasagi_k wrote, wait for a few days mirror & tutorial site creation. Today, I recieved mail from network center which notifies that the server setup was completed. I install required softwares and setup DNS, SMTP, etc at the next weakend.

www.marumo.ne.jp is downed.
now I'm working to recover it.
please shutdown your c2bf.exe and wait few hours.

www.marumo.ne.jp is recovered now.

thank you for your help and join the project. but, my server machine is poor and can not accept much more 2,000 client. (this board's team hold half of it)
now, i arrange to get more powerfull machine. please limit client counts until I change the machine.

www.marumo.ne.jp is downed.
now I'm working to recover it.
please shutdown your c2bf.exe and wait few hours.