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THE FEUTEX TOOLKIT

TLS 1.3 Record Size Budget

Estimate ciphertext record size from plaintext, padding and AEAD tag.

Networking workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
Formularecord=5+content+1+padding+tag
Sources and model references

Worked example

Inputs

Application content
1000 bytes
Zero padding
0 bytes
AEAD tag length
16 bytes

Expected results

TLS ciphertext record including header
1022 bytes
Per-record overhead
22 bytes
Content fraction
0.9784735812 fraction

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter the labeled inputs in the indicated units.
  2. Calculate and compare every output against the stated model assumptions.

Try this example

{
  "plain": 1000,
  "padding": 0,
  "tag": 16
}

Accuracy and scope

Application-data TLS 1.3 record; no TCP/IP, handshake or negotiated record-size-limit overhead. Simplified analytical model; not a design recommendation or safety certification.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.