Magic Notes

Here’s an idea I’m trying out. Here’s some text:

cat Idea.opml | tr ‘a-z’ ‘A-Z’ | md5sum
4dbb82a1048ff3e59ce5c7ccc58314ac – md5sum Idea.opml
a17de3abcf5e225d51e6eab412f25781 Idea.opml

This is some text I have written, but prefer not to publish. However, I can prove that I wrote this text before writing this blog post; since the text in this blog will be public to all, especially the search engines who will crawl it and immortalize it.

Later, I can simply say that the odds of me being able to crack the MD5 hash to custom-write a piece of text that is one out of many millions; double hashing it makes it even more difficult. This way, I can prove I wrote a piece of text at a certain time without disclosing it.

Do you think there are any flaws to this? Email me!

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About the author:

Arnab Nandi is an Assistant Professor in the Department of Computer Science and Engineering at The Ohio State University. You can read more about him here.


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