Added challenge to chapter 1

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The following changes were observed in the rendered markdown documents:

 chap1_introduction_FL.md                        |  58 +++++++++++++++++++++++-
 fig/chapter1/secret_sharing_example_1.jpg (new) | Bin 0 -> 66325 bytes
 fig/chapter1/secret_sharing_example_2.jpg (new) | Bin 0 -> 32785 bytes
 fig/chapter1/secret_sharing_example_3.jpg (new) | Bin 0 -> 37683 bytes
 md5sum.txt                                      |   2 +-
 5 files changed, 57 insertions(+), 3 deletions(-)

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:stopwatch: Updated at 2024-09-12 09:46:45 +0000

[dsmits]

@hcadavid I added an exercise about the hacker that you were suggesting. I kept the old exercise because I'm not trying to make a point about the security of secret sharing. The point is about whether aggregation in itself preserves privacy. I hope that i have made it more clear in this way.

I also added the pictures you requested.

[hcadavid]

@dsmits The example and the challenges are indeed quite clear now, they look and read nice! Should I merge the PR? or do you want @frankcorneliusmartin to add his review first?