Over the past year, ARIN has made improvements to its Transport Layer Security 
(TLS) protocol support, including removal of TLS versions 1.0 and 1.1 
(https://www.arin.net/announcements/20210120/) and Diffie-Helman key exchange 
parameters to improve security. As ARIN looks forward to eventual support of 
TLS version 1.3, we are adding support for three mandatory TLS 1.3 cipher 
suites (as defined in IETF RFC 8446 , section 9.1, at 
https://datatracker.ietf.org/doc/html/rfc8446):

- TLS_AES_128_GCM_SHA256
- TLS_AES_256_GCM_SHA384
- TLS_CHACHA20_POLY1305_SHA256 (RFC 8439)

Enabling TLS version 1.3 and cipher suites does not require any specific action 
from users of ARIN’s Whois-RWS, Reg-RWS, RDAP, and www.arin.net, and will 
provide stronger security for communications with ARIN’s network. This change 
is scheduled for 14 December 2021. ARIN will provide notification after the 
system has been updated.

Regards,
American Registry for Internet Numbers (ARIN)




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