[NikolaeVarius]

Its possible it was just the fact that a slightly different design was rated at a different secrecy level because of specific improvements.

For example, rockets and turbofans all use the same basic mechanics to function, the but differentiators are still under ITAR

[swiley]

RSA is still under ITAR too which just seems incredibly dumb.

[PeterWhittaker]

Are you sure? Between the 1996 Wassenaar Arrangement and the 1992 transfer of cryptographic regulations from Defence to Commerce, I don't believe this is the case any longer.