As I'm planning to buy a small TV for placing in a bedroom (probably UE32ES6727) - I've started to study recent firmware for new possibilities. Seems that noone have published keys to decrypt CMK files yet, so here are they:
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openssl.exe aes-128-cbc -d -K B1D5F122E75D757C79F48886D42F8E1A -in index.html.cmk -nosalt -iv BFE932F9273DC2A0DFC93F0B8E7AC7C2 -out index.html
Tested on T-MST10PDEUC, firmware 1029. Probably the keys are the same for all models, as I was able to decrypt files in samsung adhub archive downloaded from their site.
Of cause you can encrypt the files back with the same keys.
Edited, to be located in one place. Here is a command to decrypt .SMK files from SDK:
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openssl.exe aes-128-cbc -d -K 84AA59959849F6DDD4823B90F7913902 -in config.xml.smk -nosalt -iv 1DA76DE2A0EE55C0DBCCEDA772E3684D -out config.xml
Obviously, Samsung would change keys, or (wiser) switch to a non-symmetric algo in next devices, but this would not be a big problem anyway.