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"Once it's verified, the transaction's information, plus both your digital signature and your friend's digital signature, are stored in a block alongside many other transactions like it. Once the block is full, it gets a hash, which is a unique code that sort of acts like its nametag. It also stores its position on the chain and the hash of the previous block on the chain. (Here's an example block to illustrate what kind of information is stored there.) "

"Here's how the program, which has been developed in partnership with SWGfL, a UK-based non-profit behind the Revenge Porn Helpline, works. If you've shared an intimate image with someone and are worried that that person might do something nefarious with it, you can send the images to content moderators at Facebook to be "hashed"- essentially the image is assigned a digital fingerprint. If someone then tries to upload that image to Facebook it can be quickly identified and blocked. It's obviously not a silver bullet for stopping revenge porn, and it requires putting a lot of trust in Facebook and accepting that a random content moderator is going to be looking at your naked photos, but it gives people a little bit of control over their images."

"Some people assume that once quantum computing comes along modern encryption technologies will be outpowered. But experts are starting to posit that hash functions and asymmetric encryption could defend not only against modern computers, but also against quantum attackers from the future."

"It happened when Hello Kitty's fan site, SanrioTown.com, had its database accessed in late 2015. Here's the catch - it wasn't hacked. According to security researcher Chris Vickery of Kromtech, no hack was necessary. Vickery stated that pretty much anyone could access, "…first and last names, birthday…, gender, country of origin, email addresses, unsalted SHA-1 password hashes, password hint questions, their corresponding answers…," and more."

"That is, when you are continuously surveilled, when your every word - even your private conversations, even your personal journals - are subject to continuous monitoring, you never have the space in which to think things through. If you doubt a piece of popular wisdom and want to hash it out, your ability to carry on that discussion is limited the knowledge that your testing of the day's received ideas is on the record forever and may be held against you."

"The most well-documented of these deals with the hash function used to "anonymize" the license and medallion numbers. A bit of lateral thinking from one civic hacker and the data was completely de-anonymized. This data can now be used to calculate, for example, any driver's annual income. More disquieting, though, in my opinion, is the privacy risk to passengers. With only a small amount of auxiliary knowledge, using this dataset an attacker could identify where an individual went, how much they paid, weekly habits, etc. I will demonstrate how easy this is to do in the following section."

"A dump called "Collection #1" has been released by parties unknown, containing email addresses and cracked passwords: in its raw form, it contains 2.7 billion records, which Troy "Have I Been Pwned" Hunt (previously) de-duplicated to come up with 773 million unique records -- of those 140,000,000 email addresses and 10,000,000 passwords have never been seen in the HaveIBeenPwned database before."