Vigenere Cryptograms? How to find the period?

shivers20

Junior Member
Joined
Mar 3, 2006
Messages
68
KOFWA DAQLW EGRNT ZCHZT ZFWPD RRDKV LTHZS XIPMB KSWWD SESZS GAUMR KOPWJ VIQBV VNHFH KWHVH PFRCF YOXZG JTRXM FUUZS XIPMB KWLTZ SEDHB RCKMR KOWPS KEFWB UDLDW KIR

I have a n-gram & Decimation analysis program and it gave me these numbers for these intervals,

Decimation Interval= Z-value
3= 3.5
4= 1.2
5= 6.7
6=2.6
7=.20
8=0
9=.6
10=3.3
11=0
12=3
.
.
.
15=9.5

I think its decimal interval #5 How do I know if the period is #5? Its the only thing holding me up from solving the code.Thanks in advance.
 
I have been working on the code and the keyword is Radio and I figured out the code. I still dont know why the period was 5. Any ideas why?
 
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