Summary for Week 4

• Lecture 4: We started block ciphers. We discussed the Fiestel structure for block ciphers and followed it by the discussion of DES. We started discussing 2DES.
  Date: Tu, 9/21/2010.
• Lecture 5: We discussed the meet-in-the-middle attack on 2DES followed by a discussion of 3DES. We started discussing number theory basics needed for public-key cryptography.
  Date: Th, 9/23/2010.