Wrappers for Performance Timeline (Level 2) standard. More...

Functions
	if (doNoise===true)

Variables
var	doNoise = args[1]

var	pastValues = {}

	$

var	wrappers

Detailed Description

Wrappers for Performance Timeline (Level 2) standard.

See also: https://w3c.github.io/performance-timeline

Author: Copyright (C) 2019 Libor Polcak; Copyright (C) 2020 Peter Hornak

License:: SPDX-License-Identifier: GPL-3.0-or-later

This wrapper aims on prevention of microarchitectural attacks, clock-skew attacks, and other time related attacks. The goal is to limit the precision of the time returned by the Performance Timeline API.

See also: https://www.fit.vut.cz/study/thesis/22308/?year=0&sup=Pol%C4%8D%C3%A1k, especially Sect. 7.2.; Tom Van Goethem, Wouter Joosen, Nick Nikiforakis. The Clock is Still Ticking: Timing Attacks in the Modern Web. CCS'15. DOI: http://dx.doi.org/10.1145/2810103.2813632. https://lirias.kuleuven.be/retrieve/389086; Schwarz, M., Lipp, M. a Gruss, D. JavaScript Zero: Real JavaScript and Zero Side-Channel Attacks. NDSS'18.; Schwarz M., Maurice C., Gruss D., Mangard S. (2017) Fantastic Timers and Where to Find Them: High-Resolution Microarchitectural Attacks in JavaScript. In: Kiayias A. (eds) Financial Cryptography and Data Security. FC 2017. Lecture Notes in Computer Science, vol 10322. Springer, Cham. https://doi.org/10.1007/978-3-319-70972-7_13

The wrappers support the following behaviour:

Round timestamp: Limit the precision by removing (a part of) the decimal part of the timestamp.
Randomize after rounding: Create a fake decimal part to confuse attackers and to create timestamps that look similar to expected timestamps.

Function Documentation

◆ if()

if ( doNoise = == true )

Variable Documentation

◆ $

$

Initial value:

{rounding_function}
  ${noise_function}
        var func = rounding_function

◆ doNoise

var doNoise = args[1]

◆ pastValues

var pastValues = {}

◆ wrappers

var wrappers

Functions

Variables