Secret codes

1.     How is math used to decipher secret codes?  Using your knowledge of coding theory and logic describe how the codes were made and broken.  Your response must be 200-300 words in length.

How to Convert Roman Numerals | eHow.com

How to Convert Roman Numerals | eHow.com

Adding and Subtracting Numbers in alternate bases

Number Conversions

Last class we learned how to convert numbers to different bases.  Converting from the base 10 system  into another base using the following system:

The Process:
1.  Divide the "desired" base (in this case base 2) INTO the number you are trying to convert.
2.  Write the quotient (the answer) with a remainder like you did in elementary school.
3.  Repeat this division process using the whole number from the previous quotient (the number in front of the remainder).
4.  Continue repeating this division until the number in front of the remainder is only zero.
5.  The answer is the remainders read from the bottom up.






Converting from another base to base 10 requires yo to multiply the numeral by it's place value in it's base.  For example to convert 122 base 5 to base 10 you would:


122

Number Systems in the Real World

We are so used to using our base 10 system of numbering.  However there are many other ways to represent numbers.  In a response to this post, choose another number base system (binary, octal, hexadecimal, etc) and give one real world example where these numbering systems are used.  You may not duplicate an example that someone else has already given, so it is to your advantage to post early.  Credit will not be given to duplicates.  Make sure you provide a link to where you found your example.