Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
WTF, 2FA!? Y U NO PROTECT ME?
Search
Christine
April 05, 2019
Technology
0
81
WTF, 2FA!? Y U NO PROTECT ME?
Two factor authentication the worst, the best, and everything in-between.
Christine
April 05, 2019
Tweet
Share
More Decks by Christine
See All by Christine
One does not simply add MFA
tech_christine
0
59
Listening - Your Communication Superpower
tech_christine
0
220
Hanami 2.0 and You
tech_christine
1
280
ONE DOES NOT SIMPLY ADD MFA
tech_christine
0
370
One does not simply add MFA
tech_christine
0
210
MFA_Petfriendly.pdf
tech_christine
0
210
Hack Your Brain - Improve yourself and your work
tech_christine
0
600
A tale of two sides of 2FA
tech_christine
0
530
A tale of two sides of 2FA
tech_christine
0
570
Other Decks in Technology
See All in Technology
PHPカンファレンス名古屋-テックリードの経験から学んだ設計の教訓
hayatokudou
2
540
LINEギフトにおけるバックエンド開発
lycorptech_jp
PRO
0
270
Autonomous Database Serverless 技術詳細 / adb-s_technical_detail_jp
oracle4engineer
PRO
17
45k
MIMEと文字コードの闇
hirachan
2
1.4k
アジャイルな開発チームでテスト戦略の話は誰がする? / Who Talks About Test Strategy?
ak1210
1
560
設計を積み重ねてシステムを刷新する
sansantech
PRO
0
160
大規模アジャイルフレームワークから学ぶエンジニアマネジメントの本質
staka121
PRO
3
1.1k
データベースの負荷を紐解く/untangle-the-database-load
emiki
2
500
クラウド食堂とは?
hiyanger
0
110
【内製開発Summit 2025】イオンスマートテクノロジーの内製化組織の作り方/In-house-development-summit-AST
aeonpeople
2
630
サイト信頼性エンジニアリングとAmazon Web Services / SRE and AWS
ymotongpoo
7
1.5k
Potential EM 制度を始めた理由、そして2年後にやめた理由 - EMConf JP 2025
hoyo
2
2.6k
Featured
See All Featured
Faster Mobile Websites
deanohume
306
31k
Become a Pro
speakerdeck
PRO
26
5.2k
Fontdeck: Realign not Redesign
paulrobertlloyd
83
5.4k
VelocityConf: Rendering Performance Case Studies
addyosmani
328
24k
How GitHub (no longer) Works
holman
314
140k
[RailsConf 2023] Rails as a piece of cake
palkan
53
5.3k
Writing Fast Ruby
sferik
628
61k
YesSQL, Process and Tooling at Scale
rocio
172
14k
ピンチをチャンスに:未来をつくるプロダクトロードマップ #pmconf2020
aki_iinuma
114
50k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
29
1k
jQuery: Nuts, Bolts and Bling
dougneiner
63
7.7k
What's in a price? How to price your products and services
michaelherold
244
12k
Transcript
@tech_christine WTF, 2FA!? Y U NO PROTECT ME? Two factor
authentication the worst, the best, and everything in-between
None
@tech_christine
None
@tech_christine Back to the beginning
@tech_christine What was the hacker up to? Calling your mobile
provider
@tech_christine Still on the phone with your mobile provider... Using
social engineering
@tech_christine And now they have all the access... Sim swap/sim
hijacking
@tech_christine
“ @tech_christine We learned that SMS-based authentication is not nearly
as secure as we would hope, and the main attack was via SMS intercept Christopher Slowe Reddit chief technology officer and founding engineer August 2018
@tech_christine What is authentication? The process of verifying that someone
or something is the actual entity that they claim to be. - OWASP.org (these people know what they are talking about when it comes to security)
@tech_christine ... but what are the different factors of auth?
1 factor is knowledge (i.e. your password) 2 is the other method choice - Possession (token/soft token) - Identity (biometrics)
@tech_christine 2FA == 2SV == MFA 2FA = Two factor
authentication 2SV = Two Step verification MFA = Multi-factor authentication What about all those other acronyms...
@tech_christine Why didn't 2FA help? •SMS was used •2FA wasn't
even enabled
@tech_christine •Most common method •Most compromised •Not recommended by NIST
since 2016 SMS
@tech_christine Let's figure out all the ways SMS can be
hacked... 1. Sim-swap (aka what just happened to us) 2. Port-out scam 3. Brute force on the application itself
@tech_christine Time-based One Time Password aka App based aka soft
token •Authy •Google Authenticator •1Password TOTP
@tech_christine •Associated with the certain authorized devices •Not visible on
a locked phone screen Push Based Authentication
@tech_christine Token based Physical keys that can auth •USB drive
•near-field communication •Many use U2F (Universal 2nd Factor)
What would you change now?
@tech_christine So what could you have changed? •Setting up with
a VOIP number •Secure with alternate authentication method •Pin/password protect phone provider Keep on being @awesome
@tech_christine ...wait I lost my phone/app access/token Use a recovery
code Allows you access to application
@tech_christine More on recovery codes •Stored as hashes •One time
use •Shown only once
@tech_christine 2FA Implementation Best Practices • Rate limiting prevents brute
force attacks • Use a truncated exponential back-off algorithm
@tech_christine What is an exponential back-off algorithm?
@tech_christine Example in Ruby login_request if retries <= max_retries retries
+= 1 sleep (retries + rand(100)/1000) retry else raise "You've hit your max retries!" end
@tech_christine Get user buy-in Enforce authentication on all pages Users
with the most amount of privilege, 2FA is a requirement not optional
@tech_christine Now you are the info sec professional
None
@tech_christine Thank you Kernelcon and all the staff Tyson Reeder
for the final graphic(@tysondreeder) For references and further reading checkout https://christine-seeman.com/talks/