Program 1 - 'ncrpt'

DUE 11am Monday Feb 11, 2008

Now available:

• The 'ncrpt' man page (as text, as PDF, as groff source). Now Version 2, released Sat Feb 2 10:48:11 2008, with better detail about initializing ISAAC.
• The ISAAC files, changed only very slightly by Ackley to compile under gcc -Wall -ansi -pedantic:
  • standard.h
  • rand.h
  • rand.c
• the randDemo.c sample code for using the ISAAC PRNG. REVISED VERSION 2 Sat Feb 2 10:03:36 2008!
• Sample inputs and outputs:
  • sample.txt. A small file to be encrypted.
  • key1.ncr. The result of encrypting sample.txt with a key value of 1.
  • keyDeadD00d.ncr. The result of encrypting sample.txt with a key value of 0xDEADD00D. REVISED VERSION Tue Feb 5 16:56:26 2008! The original version of this file was encrypted with the wrong key!
  • key7FFFFFFF.ncr. The result of encrypting sample.txt with a key value of 0x7FFFFFFF. Note that prior to Tue Feb 5 16:56:26 2008, this file was called 'keyDeadD00d.ncr'.

• Don't freak out! There's a lot to read (START NOW!) but the final code you write can be quite small!
• Anything marked implementation-dependent in the man page is up to you the implementor to decide what to do.
• Anything marked as [optional] in the man page is for extra credit!
• Suggested way to get going: Read through the man page enough to start to see what's going on, but don't let yourself get bogged down in details anywhere. Then read through randDemo.c and get it working correctly for you.
• Email me questions!