----
   Date: Tue, 13 Apr 2010 17:05:36 -0500 (Central Daylight Savings Time)
   From: Mark Jacobson <jacobson@cns.uni.edu>                      ----
     To: 810-023-01-spring@uni.edu
Subject: Decryption assignment, submit by email to jacobson@cs.uni.edu

Hi 023 students,

Port numbers = Throw = Transport layer of 7 layer OSI model

    20/TCP       FTP  data
    21/TCP       FTP  control (command)

    22/TCP,UDP   Secure Shell (SSH)used for secure logins, file transfers
                                          (scp, sftp) and port forwarding
                                          Encrypted SSH Secure Shell uses
                                             port #22, the 22 which you see
                                             everytime you login to
                                             sunny.uni.edu.

    23/TCP       Telnet protocol - unencrypted text communications

                 sunny.uni.edu refuses all connections to port 23,
                               because it is unencrypted, not secure.
                                             -----------

    25/TCP       Simple Mail Transfer Protocol (SMTP)used for e-mail
                                        routing between mail servers
    80/TCP,UDP   Hypertext Transfer Protocol (HTTP)
   443/TCP       HTTPS (Hypertext Transfer Protocol over SSL/TLS)


     Away   Application
    Pizza   Presentation
  Sausage   Session
    Throw   Transport     = port numbers like 22 and 80 and 443.
      Not   Network       = IP numbers, IP addresses, w.x.y.z = 32 bits
       Do   Data Link     = NIC/NAC/Physical addresses = 48 bits
   Please   Physical

    http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers

    The following assignment can be done anytime;

        http://www.cs.uni.edu/~jacobson/secure/perl/vig.html

    Using the software from link VII (7) or link IX (9) on the
Vigenere ciphers page,

  http://islab.oregonstate.edu/koc/ece575/02Project/Mun+Lee/VigenereCipher.html

  http://www.cs.uni.edu/~jacobson/secure/perl/vig.html

       Decrypt the following 2 messages and send email to jacobson@cs.uni.edu
       with the decrypted plain text message, and separate the words
       in the original message by spaces.

Message One (use the one below here, without the spaces)...
-----------
sxgclybhryfcvmcfirrercrmgamepblifktnorgxkgxenbmjsrg
yaydlcergmekzyqswzoesdmdepryhyielntyxxfovqkvcgiybml
qxfompmsydwyxhevstowfopjyqgmvmmskzyrovqiwroqqkrbktn
vmakxgyrqsrrokpkxgyrqdyborrc

Message Two (this one uses a different key than message one). 
-----------
oijxwkeiffifmxdmgkscafijnqdxmnmvkbtskahuifazshqktifwijbtskakubs
duqimwwmfpeseahqvlpzahqfsiumznqzqrijfwzqijmvggazwiktifwijbtskbzqaafij

Again, all of the above is available at:

       http://www.cs.uni.edu/~jacobson/secure/perl/vig.html

       See http://www.cs.uni.edu/~jacobson/23/ to link to vig.html page.

The Java Applet will break the encryption and suggest what the secret key 
might have been or should I say, might BE, i.e. 14 = BE = the key from
this morning's "group" exercise.       --       --   --

   -----------------------------------------------------
    Last StudioIT 1 (ITT 134 class) on Thursday morning.
   -----------------------------------------------------

   Mark