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Ask HN: obfuscated link vs. username/password?

In building a couple simple web apps, I'm considering using an obfuscated link: http://domain.com/8498j9f43498j9f43o8jeo8je9jfe that members can bookmark, rather than require a username and password every time.

Terrible idea? What are the risks if the url is long and random enough?

( 2 comments | 3 points | on HN )
Re:Ask HN: obfuscated link vs. username/password? by byoung2 on Wednesday September 29, 2010 @03:44PM (#1740837)
What are the risks if the url is long and random enough?

Users wouldn't be able to use public/shared computers without the risk that this URL would be left behind.

Re:Ask HN: obfuscated link vs. username/password? by wwortiz on Wednesday September 29, 2010 @03:46PM (#1740846)
I don't sync bookmarks and rarely use them; so take multiple computers/devices and I wouldn't be using your service very easily