Constitutional boundaries and the 4th amendment applies. They do need a warrant, but with a warrant they are allowed to go through all your electronic records o

Constitutional boundaries and the 4th amendment applies. They do need a warrant, but with a warrant they are allowed to go through all your electronic records on your devices just as they are allowed to go through all your written records in your drawers and safes and envelopes. Encryption has no special treatment that would cause 5th amendment to apply. 5th amendment may apply if they ask you to tell something (e.g. a password), but if they can break your encryption without your assistance, then there's no difference if they're decrypting a physical letter or an electronic file, if the evidence (that letter or that file) was lawfully obtained, they can do that.