UNIX passwords are insecure because they are short. In this case the DNA sequence is how long? Brute force breaking it wouldn't make it insecure.
Now as for people entering the information, yes it is insecure in that sense but so is purchasing things online. Or using your credit card at a supermarket. The potential dammage that a person entering the infomation could do is very minimal. They would get a very small number of peoples DNA and then what would they do with it? Plus that would be highly illegal.
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