Date Shift and Caesar Ciphers
This is the Date-Shift Cipher ( I used four digit not a full 6-digit date)
Pick a date. An example would be Steven Spielberg's birthday: December 18, 1946.
2
Write out that date using numbers and slash marks: 12/18/46.
3
Get rid of the slashes, leaving you with a six-digit number that you will use to encipher your message: 121846. Assume the message is "I enjoy the movies of Steven Spielberg." Under the message, you will write your six digit number over and over until you come to an end: 1 21846 121 846121 84 612184 612184612 is the secret message. However, it is not done yet.
4
Write out the alphabet from left to right.
5
Shift each letter of the plain text by the number of spaces indicated by the number below it. The letter I shifts one space, making it J; E shifts 2 spaces, making it G. Notice in the word message the Y shifts 6 spaces, causing you to wrap around back to the beginning of the alphabet, landing at E. Your final message would be: J gorse ujf usbjgt wj yugwmr yqkftfksi.
If you wanted to decipher this message, simply reverse the process: write out the numerical code, then go back that many spaces of the alphabet.
The Date Shift Cipher has an added advantage into it in that it is fairly random - you can change the date at any time. This allows you to update your system much more easier than other ciphers. Famous dates, such as December 7, 1941 (12/07/41), should be avoided, however.
Heres the Caesar Cipher - It's very similar to the Date shift only instead on a different number for the letters, it's the same number.
Just shift the alphabet as many places as you want. Say you choose 2 "A" becomes "C" and so on and so forth.