<begin background (probably known to all/most):> NSEC3 was motivated as a method to prevent Zone enumeration, then Berenstein showed its defense is pretty weak. RFC7129 (White Lies) prevents this enumeration attack but requires online signing with the zone's key, which introduces another vulnerability and, of course, overhead of online-signing. NSEC5 was proposed to prevent enumeration without online signing, so arguably more secure than RFC7129, but has comparable online overhead and appears `dead'; the I-D expired (last update July'17).  

Note that NSEC3 also supports `opt-out', which reduces overhead for adoptions in domains with many non-adopting ASes, and I believe is not supported by NSEC. 

<end background>

Questions: 

- Do you find zone enumeration a real concern? 

- Do you think the white-lies countermeasure is sufficient and fine, or do you have security and/or performance concern (or just think it's pointless)? 

- and the final question... would you think an alternative to NSEC5 which will be more efficient and simpler would be of potential practical importance, or just a nice academic `exercise'? 

I'm really unsure about these questions - esp. the last one - and your feedback may help me decide on the importance of this line of research. Just fun or of possible practical importance? 

thanks and peace, Amir