cryptopals.com

https://cryptopals.com· First analyzed 25 May 2026· Updated 25 May 2026

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cryptopals.com

Mobile

Sponsored

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

3.164.230.45

Site Location

🇸🇪 Swedenvia ip

Server Location

🇸🇪 Stockholm, Sweden

ASN

AS16509

Organization

AWS CloudFront (GLOBAL)

Server

AmazonS3

CDN

CloudFront

Nameservers

ns1.ebrand.be.ns2.ebrand.be.ns3.ebrand.be.ns4.ebrand.be.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

338 ms10%

Speed Index

439 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

21 KB

3 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Frontend

Styling

Bootstrap

Infrastructure

Platform

AWS CloudFront

CDN

CloudFront

Technology Stack

1 Technologies Detected

CSS Frameworks

Bootstrap

SEO Analysis

D47/100

Meta Tags7/15

Content12/12

Headings3/8

Technical5/21

E-E-A-T3/7

Images0/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

cryptopals.comcryptopals.com

The Cryptopals Crypto Challenges

No description available for this page.

Title Length32 chars

Recommended: 50-60 chars (~191px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (3)

• Missing meta description — important for click-through rates in SERPs
• Missing H1 tag — every page should have exactly one H1
• Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

12 issues found

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Local SEO

Local Search Readiness

0/100

Poor

15 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

F35/100

Bot Access

20/25

Machine Read.

10/25

Schema Data

0/25

Citation

5/25

AI Bot Access

14/14 accessible

AI Search

OAI-SearchBot

PerplexityBot

Claude-SearchBot

Gemini-Deep-Research

DuckAssistBot

Training

GPTBot

ClaudeBot

Google-Extended

Meta-ExternalAgent

Bytespiderinfo

Amazonbot

Applebot-Extended

CCBotinfo

Fetch

ChatGPT-User

Machine Readability

llms.txt

llms-full.txt

Semantic HTML

Heading Hierarchy

Text ratio:66%

Words:829

Token eff.:Optimal

Sections/1K:2.4

Structured Data

No Schema

Citation Readiness

Opening Summary16w

Descriptive Headingsavg 4w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (12)

AI readiness recommendation preview...

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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.

64/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

4/20

Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.

Forms & Inputs

15/15

Verifies form fields have labels, error messages are clear, and inputs are properly associated.

Color & Contrast

15/15

Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.

Keyboard & Focus

9/15

Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).

ARIA & Roles

1/15

Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.

3 recommendations

•Accessibility recommendation preview...

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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.

76/100

A+

2 mg

CO₂e / view

21.4 KB

Page Weight

95%

Cleaner Than

New Visitor

3 mg

Returning (cached)

1 mg

Annual (10K/mo)

264 g

Emission Segments

Data Center

<0.001 g

Network

<0.001 g

Device

1 mg

Resource Breakdown

CSS

18.3 KB

HTML

3.0 KB

Green Hosting Verified

Amazon Web Services (AWS)

Provider Match

2 recommendations

•Carbon footprint recommendation preview...

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Security Score

76%Good

Static / Informational

HTTPS

WAF

231d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Amazon

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

13.12.2025

Valid Until

11.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

cryptopals.com*.cryptopals.com

SHA-256 Fingerprint

40:66:95:FC:50:30:65:0E:D9:10:39:FE:2F:EA:38:0E:03:79:43:35...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

age

68481

alt-svc

h3=":443"; ma=86400

content-encoding

⚡ Brotli(br)

content-security-policy

script-src 'strict-dynamic' 'unsafe-inline' http: https:; ob...

content-type

text/html

date

Sun, 24 May 2026 09:40:30 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

Domain Information

cryptopals.com

Domain Age

11y 10m

Created

30.07.2014

Expires

30.07.2026

Last Updated

24.07.2025

Registrar

EuroDNS S.A.

DNSSEC

Not Enabled

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.

39/100

Not Mobile Friendly1 breakpoint

Viewport Meta

The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.

Responsive Design

Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.

Touch Icons

Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.

Readable Font Size

Base font size should be at least 16px on mobile to ensure text is readable without zooming.

Relative Units

Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.

No H-Scroll Risk

No elements wider than the viewport that would cause horizontal scrolling on mobile devices.

Tap Targets OK

Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.

No Fixed Widths

No elements with fixed pixel widths that could overflow on smaller screens and break the layout.

3 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Sentinel SSm A

WCAG Partial

62/100

Readability

/30

23/30

15px · LH 1.43

Hierarchy

/20

8/20

WCAG

/25

17/25

2.41:1 min contrast

Performance

/25

14/25

1 font

Heading Font

Sentinel SSm A

Sans

Body Font

Sentinel SSm A

Sans15px

Contrast Ratio

2.41:1

13 issues

Reading Comfort

~37 CPL

Narrow lines

32px

26px

19px

15px

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

✅ Optimal line spacing: 1.43 ratio (ideal range 1.4–1.6).

⚠️ Partial contrast: 13 elements below WCAG AA threshold (min 2.4:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Lean font stack: 1 font families keeps load times fast.

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFontsFlesch 67

Color Palette

7 unique colors

2.96:1 Fail Light

#ffffff

Background· 85.6%

#8f979e

Other· 2.2%

#a9b8bb

Primary· 2.8%

#b2d4d0

Secondary· 0.8%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

2 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

cryptopals.com

11 years old

Location detected: 🇸🇪 Swedenvia ip

EuroDNS S.A.

Sponsored

Last analyzed: 25 May 2026 at 04:42

Historical Analysis & Change Tracking