I was watching a TED Talk about password security recently which covers quite a few different types of passwords and compares how secure they are and how easy they can be remembered.
One type of password that wasn't mentioned, however, is what I call "pattern passwords". Those are passwords like "vbfhrudjxm" or "cde3$RFVbgt5" which follow a pattern on the keyboard:
My naive assumption is that even though their entropy is clearly lower than that of true random passwords of the same length they should have a comparably strength against dictionary and brute force attacks while at the same time they are much easier to remember and type. Is this assumption correct?
One disadvantage is of course that if you remember the pattern rather than the actual characters you might run into problems if you encounter a keyboard with another layout (especially with non-alphanumeric characters) but that can be a problem with other types of passwords too.
This question about pattern lock on touch devices is related but those offer a lot less possible combinations and are usually shorter and this question also talks about "pattern based" passwords but in the sense of a pattern in the structure of the password rather than a pattern on the input device.