| Signature
method |
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| 1. | Register
signature of authority doc |
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| 2. | Check a query
doc against existing |
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| signature |
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| 3. | Flag down very
similar documents |
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| Some design
choices have to be made: |
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| ¡ | How to compute
a signature |
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| ¡ | How to judge
similarity between |
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| signatures |
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