I used the FIPS provider in the JCE, but couldn’t really see any difference – I specifically looked for the maximum key sizes but didn’t find any difference there.
What advantages does enabling FIPS actually provide?
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It simply means the JCE meets FIPS requirements. The main difference is that some less-secure ciphers are removed (like DES). Because most strong ciphers already meet FIPS requirements, you wouldn’t be able to see differences by checking maximum key sizes.
It’s also a market term used by IBM, who calls all versions of their JCE as FIPS JCE.