Version 8.1 of Acrobat and Reader provides a FIPS mode to restrict data protection to Federal Information Processing Standard (FIPS) 140-2 approved algorithms using the RSA BSAFE Crypto-C 2.1 encryption module.
The following options aren’t available in FIPS mode:
Applying password-based security policies to documents. You can use public key certificates or Adobe LiveCycle Policy Server to secure the document, but you cannot use password encryption to secure the document.
Creating self-signed certificates. In FIPS mode, you cannot create self-signed certificates.
In FIPS mode, you can open and view documents that are protected with non-FIPS compliant algorithms, but you cannot save any changes to the document using password security. To apply security policies to the document, use either public key certificates or LiveCycle Policy Server.
Configure FIPS mode (Windows)