Table 3 |
||||
|
Keyed hash bigram subset communication volume. Overhead for various minimum bigram score thresholds compared to the unencrypted communication of the original values. The average (unencrypted) surname and suburb name lengths were 6.4 and 9.3 characters, giving rise to an average of 166 and 2,521 bigram subsets respectively. A total of 2,323,355 records were processed. |
||||
|
Minimum bigram score threshold |
Surnames |
Suburb names |
||
|
|
||||
|
Megabytes communicated |
Overhead |
Megabytes communicated |
Overhead |
|
|
|
||||
|
0 |
7540 |
520 |
114399 |
5435 |
|
0.1 |
7540 |
520 |
114384 |
5435 |
|
0.2 |
7484 |
516 |
113787 |
5406 |
|
0.3 |
7132 |
492 |
109679 |
5211 |
|
0.4 |
6287 |
434 |
97300 |
4623 |
|
0.5 |
4238 |
292 |
63892 |
3036 |
|
0.6 |
2836 |
196 |
35091 |
1667 |
|
0.7 |
1242 |
86 |
12154 |
577 |
|
0.8 |
511 |
35 |
3056 |
145 |
|
0.9 |
185.0 |
12.7 |
442.4 |
21.0 |
|
1 |
45.4 |
3.13 |
45.4 |
2.16 |
|
Original values |
14.5 |
1 |
21.1 |
1 |
|
|
||||
|
Churches and Christen BMC Medical Informatics and Decision Making 2004 4:9 doi:10.1186/1472-6947-4-9 |
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