HMAC and AES overhead

Owned by Jean-luc KRIKER

Last updated: Jun 28, 2021

1 min read

https://junipernetworks.sharepoint.com/sites/AI-DE-SalesGTM/Shared%20Documents/Forms/AllItems.aspx?id=%2Fsites%2FAI%2DDE%2DSalesGTM%2FShared%20Documents%2F128%20Technology%2FSVR%2DPacket%2DGrowth%2Epdf&parent=%2Fsites%2FAI%2DDE%2DSalesGTM%2FShared%20Documents%2F128%20Technology

AES overhead:

encryption process will add anywhere from 16 to 31 bytes to the overall size

HMAC overhead:

The SSR can optionally authenticate the packets it sends using HMAC (hash-based message authentication code).

Enabling HMAC authentication (done in security > hmac-mode) will add 16bytes of overhead to packets.

MetaData:

minimum metadata size is 12 bytes.

include the text string identifying the service and tenant used in the transaction