- What the Label CHS-CY1 Actually Means
- Decoding the Parts: CodeHS, Cybersecurity, Level 1
- What the Exam Looks Like
- The Six Topic Areas Behind the Name
- What CHS-CY1 Is Not
- Vouchers, Attempts, and the 10-Year Validity Window
- Who Benefits From the Credential
- Mapping Your Prep to the Six Topic Areas
- Frequently Asked Questions
- CHS-CY1 refers to the CodeHS Cybersecurity Level 1 certification exam, issued by CodeHS.
- The exam has 45 multiple-choice questions, is timed at 90 minutes, and requires a 60% to pass.
- Six topic areas are tested, from Cybersecurity Essentials through Digital Safety and Data Security.
- No prerequisites exist, and each exam attempt requires a new voucher.
What the Label CHS-CY1 Actually Means
When people search for the meaning of CHS-CY1, they are usually trying to place a code they saw in a classroom portal, a course syllabus, or a certification listing. On this site, CHS-CY1 means CodeHS Cybersecurity Level 1: the entry-level cybersecurity certification exam offered by CodeHS, the computer science education platform widely used in middle and high school classrooms.
The label is a shorthand. "CHS" points to CodeHS, "CY" signals the cybersecurity track, and "1" marks the first level of that track. The credential is aimed at learners who are just starting to build a vocabulary for how computers, networks, and data are attacked and defended. If you want the plain-language version of the definition, our explainer on what CHS-CY1 is covers the same ground from a beginner's angle, and the page on what CHS-CY1 stands for breaks the abbreviation down piece by piece.
Decoding the Parts: CodeHS, Cybersecurity, Level 1
CodeHS as the issuer
CodeHS publishes the exam, defines the topics, issues vouchers, and sets the scoring rules. That matters because every fact about format, passing score, and validity comes from CodeHS rather than from an outside standards body. Its official Cybersecurity Level 1 certification page and its Certifications FAQ are the sources of truth for the exam.
Cybersecurity as the subject
The "CY" portion tells you the subject is cybersecurity, but the exam is broader than the word suggests. It reaches into cryptography, system administration, networking, hardware, and everyday digital safety. A candidate who studies only hacking headlines will miss large parts of the exam.
Level 1 as the starting rung
"Level 1" is the entry point. CodeHS states there are no prerequisites, so you do not need to hold another certification first. The exam's scope is Cybersecurity Level 1 only; it does not borrow content from Cybersecurity Level 2. For more on eligibility, see our breakdown of CHS-CY1 requirements.
What the Exam Looks Like
Knowing what the code stands for is only useful if you also know what you are signing up to sit. The core facts, as published by CodeHS, are straightforward.
| Exam Feature | CHS-CY1 Detail |
|---|---|
| Issuer | CodeHS |
| Question count | 45 questions |
| Question style | Multiple choice |
| Delivery | Online, timed exam |
| Time limit | 90 minutes |
| Passing score | 60% |
| Prerequisites | None |
| Retakes | New voucher required for each attempt |
| Credential validity | 10 years |
The 60% threshold applies to all CodeHS certification exams except Java, per the Certifications FAQ. On a 45-question exam, that framing is easiest to understand as a proportion of questions answered correctly. Our dedicated page on the CHS-CY1 passing score explains how to think about that target while you practice.
Because every item is multiple choice, the exam rewards recognition and reasoning more than recall of long written answers. With 90 minutes for 45 questions, pacing is rarely the main obstacle; the harder part is knowing the terminology well enough to distinguish between answer choices that sound similar.
The Six Topic Areas Behind the Name
CodeHS lists six "Topics & Concepts Covered" headings for the exam. It does not publish percentage weights for them, so no one can honestly tell you that one area makes up a specific share of the test. What you can do is learn each area thoroughly. For a deeper walk-through, see our complete guide to all six CHS-CY1 content areas.
Domain 1: Cybersecurity Essentials
The conceptual foundation. This area covers the threats and principles that frame everything else.
- Ransomware and phishing as common attack types
- Internet of Things devices and their security implications
- The CIA Triad (confidentiality, integrity, availability)
- Cyber ethics, credit and copyright, and the difference between legal and illegal hacking
Domain 2: Cryptography
Classical encryption and how it is broken. Expect to reason about how a cipher works and why it fails.
- Basic cryptography and code breaking
- Brute force and frequency analysis
- The Caesar cipher and the Vigenere cipher
Domain 3: System Administration
How operating systems and software are managed and secured.
- Operating systems, software, and software licenses
- Application security and browsers
- System administration tasks and the command line
Domain 4: IT Concepts
The mechanics of how data moves across the internet.
- Internet addresses, IPv4 and IPv6
- The DNS hierarchy and routing
- Packets and protocols
Domain 5: IT Infrastructure
The physical and networked equipment that makes systems run.
- Internal components and peripheral devices
- Network devices and storage options
- Network options, network communication, and network management
Domain 6: Digital Safety and Data Security
Personal safety online plus an introduction to how data-driven applications are attacked.
- Digital footprint, cyberbullying, and internet safety
- Clients and servers
- SQL queries and SQL injection
- Developer tools
What CHS-CY1 Is Not
Part of understanding a certification's meaning is knowing its boundaries. CHS-CY1 is not a replacement for Cybersecurity Level 2, and it does not cover Level 2 material. It is also not a course; it is an exam. CodeHS recommends its Fundamentals of Cybersecurity course as preparation, but completing that course is a recommendation rather than a requirement, since the exam has no prerequisites.
It is also worth being realistic about what an entry-level, multiple-choice credential signals. It demonstrates that you have a working vocabulary across core cybersecurity and IT concepts. It does not, on its own, make a claim about hands-on penetration testing or incident response experience. If you are weighing whether it is worth your time, our ROI analysis of the CHS-CY1 certification walks through the trade-offs, and our overview of the certification itself gives the broader picture.
Vouchers, Attempts, and the 10-Year Validity Window
Two administrative details shape how candidates plan their attempts.
- Vouchers are per attempt. CodeHS requires a new voucher for each exam attempt. If you do not pass the first time, a retake means obtaining another voucher rather than simply re-entering the exam.
- Credentials expire after 10 years. CodeHS states that certification credentials have a 10-year lifespan, which is long enough that most learners will not need to think about renewal during their school or early-career years.
Specific fees are not published in the sources this site relies on, so we do not quote a price here. Because each attempt needs a voucher, it makes practical sense to prepare thoroughly before your first sitting. Our CHS-CY1 certification cost page explains how to think about the cost side without guessing at figures, and the exam dates and scheduling guide covers timing questions.
Who Benefits From the Credential
CodeHS is a classroom-oriented platform, so the most natural audience is students, particularly those in high school or early college computing courses, along with self-directed beginners exploring cybersecurity as a possible path. Teachers and program coordinators also use CodeHS certifications as a way to give learners a concrete, externally defined goal.
For career-minded candidates, the honest framing is that Level 1 is a starting signal. It shows initiative and foundational literacy that can support applications to internships, entry-level IT help-desk roles, or further study. We do not publish invented salary or hiring numbers; if you want to explore the career side qualitatively, see our pages on CHS-CY1 jobs and the CHS-CY1 salary guide, which discuss the topic without fabricating figures.
Mapping Your Prep to the Six Topic Areas
You do not need an elaborate system, but the six areas differ in how they reward preparation, so ordering them sensibly helps. Here is one way to sequence a six-week plan around the actual domains.
Cybersecurity Essentials
- Define ransomware, phishing, and IoT risks in your own words
- Memorize the three parts of the CIA Triad and give one example of each
- Separate legal from illegal hacking using ethics scenarios
Cryptography
- Encrypt and decrypt by hand with the Caesar cipher
- Work a short Vigenere example to see why a keyword changes the pattern
- Explain why frequency analysis breaks simple substitution and how brute force differs
System Administration
- Review operating system roles and software license types
- Practice basic command line navigation
- Connect application security and browsers to real attack scenarios
IT Concepts and IT Infrastructure
- Compare IPv4 and IPv6 and trace how DNS resolves a name
- Describe how packets and protocols carry data across routers
- Match network devices, storage options, and peripherals to their jobs
Digital Safety and Data Security
- Read simple SQL queries and spot how SQL injection alters them
- Distinguish clients from servers and know what developer tools reveal
- Review digital footprint, cyberbullying, and internet safety scenarios
Timed Practice
- Take full 45-question sets under a 90-minute limit
- Review every missed question by domain
- Revisit the weakest area before booking your attempt
The reasoning behind this order: Domain 1 gives you the vocabulary that every other domain assumes, cryptography rewards hands-on practice early, and the networking and infrastructure areas benefit from being studied back to back since they share concepts. For a fuller approach, our CHS-CY1 study guide and one-page cheat sheet pair well with a timeline like this, and our overview of CHS-CY1 training covers structured preparation options.
Key Takeaway
Since CodeHS publishes no domain weights, avoid skipping any of the six areas. Use timed practice from the CHS-CY1 practice test site to find your weakest domain, then rebalance your remaining study time toward it.
Frequently Asked Questions
On this site, CHS-CY1 means CodeHS Cybersecurity Level 1, the entry-level cybersecurity certification exam from CodeHS. It is a 45-question, multiple-choice, online timed exam. Our page on what CHS-CY1 means gives the short version.
The exam is timed at 90 minutes and contains 45 multiple-choice questions. CodeHS lists the passing score as 60% for all of its certification exams except Java, which includes CHS-CY1.
No. CodeHS states there are no prerequisites. It does recommend the Fundamentals of Cybersecurity course as preparation, but taking that course is optional.
CodeHS requires a new voucher for each exam attempt, so a retake means obtaining another voucher. Preparing with timed practice before your first attempt helps you avoid that extra step. You can check how hard candidates tend to find it in our difficulty guide.
CodeHS states that certification credentials expire after 10 years. Published pass rates and fees are not available in CodeHS's official sources, so this site does not quote figures for them; see our pass rate page for how we handle that.