r2 - 2004-08-21 - 18:28:00 - SteveKosteckeYou are here: NTP >  Support Web > ChoosingAnIdentityScheme
NTP users are strongly urged to take immediate action to ensure that their NTP daemons are not susceptible to being used in distributed denial-of-service (DDoS) attacks. Please also take this opportunity to defeat denial-of-service attacks by implementing Ingress and Egress filtering through BCP38.

ntp-4.2.8p15 was released on 23 June 2020. It addresses 1 medium-severity security issue in ntpd, and provides 13 non-security bugfixes over 4.2.8p13.

Please see the NTP Security Notice for vulnerability and mitigation details.

Are you using Autokey in production? If so, please contact Harlan - he's got some questions for you.

Choosing An Identity Scheme

There are three Autokey Identity Schemes currently included in the NTP Reference Implementation: IFF, GQ, and MV:

Shared Secret Group Client Key Group Server Key Individual Client Key
Crypto Password Individual Shared Shared
Key Updates      
Key Revocation     Individual Client revocation is possible but not currently implemented
Best used for     Situations where indivdual client keys are required.
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