Editing Final Report/Thesis 2015 (section)

===One-Time Pad Explanation===
The ''one-time pad'' is a decoder technology which cannot be cracked if the correct
''key'' is used.  For example, if we have a ''ciphertext'', we need the ''key'' to decode it
and get correct message <ref> S.M. Bellovin. (2011, July 12). Frank Miller: Inventor of the One-Time Pad
[online]. Available:
http://www.tandfonline.com.proxy.library.adelaide.edu.au/doi/full/10.1080/0161
1194.2011.583711#abstract </ref>. 

[[File: Technical_Background_One-Time_Pad.png |thumb|1000px|centre|'''Fig. 8:''' ''One-Time Pad'' Example <ref>No Author. One-time pad [online]. Available: http://enc.slider.com/Enc/OneTimePads</ref>]]

As in Figure 8 <ref> No Author. One-time pad [online]. Available: http://enc.slider.com/Enc/OneTimePads </ref> shown above, we have the cipher text: EQNVZ. E is the fifth letter in the alphabet, so we label it as 4 (initially we label the first letter, A, as 0).  Similarly, the letter Q is 16, N is 13, V is 21 and Z is 25. If we have a ''key'' which is: XMCKL, we can label X as 23, M as 12, C as 2, K as 10 and L as 11 using the same method as above. Then we use E minus X and process all cipher text elements one by one. Negative numbers are not used, so E minus X equals -19, then we add 26 and get the number 7, which represents letter H. Finally, we find the original message to be HELLO. The ''one-time pad'' technique will be used as another method to attempt to decipher the Somerton Man code.