The compliance with the highly secure encryption standard, Advanced Encryption Standard 256 (AES-256), should ensure virtual uncrackability and is commonly used by many of the most popular VPN providers to protect private data. However, the term "military-grade" may simply be a marketing tool.


Katie Rees writing in Make Use Of makes the following points:
  • Three main types of AES encryption: 128, 192 and 256-bit.
  • The higher the bit number, the longer the encryption key.
  • Used by the US military and NASA.
  • There seems to be no reason not to use free AES-256 VPN plans.


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