At GeneInfoSec we are working on a method that will allow all sequencing services to encrypt DNA molecules themselves. With this molecular encryption even your sequencing service will not have access to your genetic data.
How does this work? Are you mutating the sequences in some random, but reversible way?
With unique molecular tags, random mutation and PCR, various cryptographic methods can be applied. But random mutation and PCR are not necessary for some relatively simple use cases. Reversible mutation is not used, but the information concealed through mutation is recoverable with the decryption keys.