My being an admirer of Edward Snowden I've read several books about him. In each book and article there was said that he used four laptops in Hong Kong. Not for storing the documents, but because it was for security and it's a security technique.
I've tried to look up how four laptops can be more secure than one, but I can't find anything about why.
So, my question is why are four laptops more secure than one (or two, or three, for that matter) and what role separation should be used on them to improve security?
- Laptop 1: Highly-encrypted and pass-secured disk/BIOS/... air-gapped without NIC laptop to store documents/contacts/files/...
- Laptop 2: Highly encrypted network- & connection-encryption for communicating.
- Laptop 3: Laptop with IDS (and eventually IPS) to detect network or malware intrusion.
- Laptop 4: Same security as laptop 1, but with more obfuscation to store passwords in a self-made local highly-encrypted database (with self-destruction if wrong master-password?) OR for testing USBs and files for malware (because passwords can also be stored on laptop 1).