Interesting concept. You're basically creating a 30 character password containing only the 26 characters of the alphabet, as opposed to a 15 character password containing alphabet, numeric, and special characters.
The article points out that this method doesn't generate much more entropy than a 15 character password.
The resulting passphrase wouldn't be accepted by common password filters that require a combination of letters, numbers, and special characters.
A complex 15 character password can be generated (and remembered) by just coming up with a sentence that contains a couple strings of numbers and inserting special characters. Works for password filters and is easy to remember. Doesn't seem to me that memorizing a random set of words is any easier than creating a memorable sentence.
Add in the problem that most "hacking" is done by exploiting software flaws (including flaws in encryption processes) and it seems like this is a lot of work for very little gain.
Looks like a solution in search of a problem.
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