Choosing passwords: random, mnemonic phrases and more

Folks at the Cambridge University Computer Laboratory have done a good study on different password selection approaches which is summarized in two papers:

1. The Memorability and Security of Passwords - Some Empirical Results by Jianxin Yan, Alan Blackwell, Ross Anderson and Alasdair Grant (PDF format)
2. A Note on Proactive Password Checking by Jianxin Jeff Yan (PDF format)

Crispin Cowan also has some interesting comments on the conclutions reached by the study.

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