Encryption
The last patch versions of Internet Explorer 3 supported 40-bit and 128-bit encryption, using Server Gated Cryptography (SGC). 256-bit encryption would not become available in IE for nearly 10 years, with the Windows Vista version Internet Explorer 7.
128-bit encryption was available or included for these versions:
- Microsoft Internet Explorer 3.03 for Windows NT 3.51 SP 1
- Microsoft Internet Explorer 3.02
- Microsoft Internet Explorer 3.0 for Macintosh
If it was not possible to upgrade to 128-bit, then 40-bit (SGC) was standard.
Read more about this topic: Internet Explorer 3