9.1-9.4 For 9 November

1. The most difficult part was working out the details of how the el-gamal signature scheme works. The elgamal encryption is still a little new so it was good to see it in another setting to get a better idea of how it is secure.

2. I thought that this was an interesting way to get a secure way of verifying that someone sent something. I thought that it was very interesting that the message could be known and the source of the message be known with certainty.