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How to Choose a Password - Computerphile

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Some people watching will have good passwords, some people will have thought

about this before,

some people should have thought about this and haven't, and hopefully will

after we talked about this a little bit more. Um, in the previous video I showed you

cracking a password using pretty basic techniques, right?

There are people who know

more about this than me who run other custom dictionaries and rule-sets and

things, right?

It's not really important for getting the message across of just

how quick this is.

Picking a good password was actually a lot easier than people

make it.

XKCD alluded to this and we'll talk about that in a minute. It didn't necessarily answer

every question but it did get a good message across and then as other aspects

should you reuse passwords and, and so on.

Umm... so let's address these. Password crackers and and people who research

password security talk about something called password entropy, which is the

amount of information held in a password,

the idea being that if you're not holding much information in a password, it's

going to be cracked very quickly because it's not a much

search space to go through. Now in some ways I think that's a bit of an


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