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CSI's Example CTF Problems

Caesar Salad

Krish was eating a Caesar salad with a bunch of wet croutons when he sent me this: fvl{l_oryh_vdodg}. Can you help me decipher his message?

Little Piggy

One day little pig Larry was walking down the road, and he stumbled upon a letter saying

Little Piggy

Can you please help him decipher this message?

What the HEX!

What the HEX man! My friend Rohan just posted this message and I have no idea what it means >:( Please help me decode it: csi{61 70 63 73 5f 68 65 78}

Cover all the bases

It seems my friend Rahul won't stop sending cryptic messages and he keeps mumbling something about base 64. Quick! We need to figure out what he is trying to say before he loses his mind... Y3Npe2Jhc2ViYWxsfQ==

I spy with my little eye…

Sherlock has messed up with Dr. Watson’s blog, and has hidden a code inside the website. Can you help Dr. Watson find the code.

Watson's blog

Submit you answers here!

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, 'i'); if (__m === '*' || __re.test(location.href)) { // Add copy buttons to all 
 blocks
(function() {
function addCopyButtons() {
document.querySelectorAll('pre code').forEach(function(codeBlock) {
if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;
codeBlock.parentElement.setAttribute('data-copy-added', 'true');
var btn = document.createElement('button');
btn.textContent = 'Copy';
btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';
btn.onmouseover = function() { this.style.opacity = '1'; };
btn.onmouseout = function() { this.style.opacity = '0.7'; };
btn.onclick = function() {
navigator.clipboard.writeText(codeBlock.textContent).then(function() {
btn.textContent = 'Copied!';
setTimeout(function() { btn.textContent = 'Copy'; }, 1500);
});
};
codeBlock.parentElement.style.position = 'relative';
codeBlock.parentElement.appendChild(btn);
});
}
addCopyButtons();
// Re-run on dynamic content
var observer = new MutationObserver(addCopyButtons);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '
GitHub - Computer-Science-Innovators/CTFProblems · GitHub
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Repository files navigation
CSI's Example CTF Problems
Caesar Salad
Krish was eating a Caesar salad with a bunch of wet croutons when he sent me this:
fvl{l_oryh_vdodg}. Can you help me decipher his message?
Little Piggy
One day little pig Larry was walking down the road, and he stumbled upon a letter saying
Little Piggy
Can you please help him decipher this message?
What the HEX!
What the HEX man! My friend Rohan just posted this message and I have no idea what it means >:( Please help me decode it: csi{61 70 63 73 5f 68 65 78}
Cover all the bases
It seems my friend Rahul won't stop sending cryptic messages and he keeps mumbling something about base 64. Quick! We need to figure out what he is trying to say before he loses his mind... Y3Npe2Jhc2ViYWxsfQ==
I spy with my little eye…
Sherlock has messed up with Dr. Watson’s blog, and has hidden a code inside the website. Can you help Dr. Watson find the code.
Watson's blog
Submit you answers here!
About
No description, website, or topics provided.
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
(function() {
var style = document.createElement('style');
style.textContent = '
.markdown-body {
color-scheme: dark light;
}
.markdown-body pre { background: #161b22 !important; }
.markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }
.markdown-body table th, .markdown-body table td { border-color: #30363d !important; }
.markdown-body img { background: #0d1117; }
.markdown-body blockquote { border-left-color: #8b949e; }
.markdown-body hr { border-color: #30363d; }
';
document.head.appendChild(style);
})();
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - Computer-Science-Innovators/CTFProblems · GitHub
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peppa.png
peppa.png
watson_blog.md
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Repository files navigation
CSI's Example CTF Problems
Caesar Salad
Krish was eating a Caesar salad with a bunch of wet croutons when he sent me this:
fvl{l_oryh_vdodg}. Can you help me decipher his message?
Little Piggy
One day little pig Larry was walking down the road, and he stumbled upon a letter saying
Little Piggy
Can you please help him decipher this message?
What the HEX!
What the HEX man! My friend Rohan just posted this message and I have no idea what it means >:( Please help me decode it: csi{61 70 63 73 5f 68 65 78}
Cover all the bases
It seems my friend Rahul won't stop sending cryptic messages and he keeps mumbling something about base 64. Quick! We need to figure out what he is trying to say before he loses his mind... Y3Npe2Jhc2ViYWxsfQ==
I spy with my little eye…
Sherlock has messed up with Dr. Watson’s blog, and has hidden a code inside the website. Can you help Dr. Watson find the code.
Watson's blog
Submit you answers here!
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
2 watching
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0 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
(function() {
var ref = document.referrer;
var terms = [];
if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {
var url = new URL(ref);
var q = url.searchParams.get('q') || url.searchParams.get('p');
if (q) {
terms = q.split(/\s+/).filter(function(t) { return t.length > 2; });
}
}
if (terms.length === 0) return;
var style = document.createElement('style');
style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';
document.head.appendChild(style);
function highlight(node) {
if (node.nodeType === 3) { // text node
var text = node.textContent;
var found = false;
terms.forEach(function(term) {
var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\]\\]/g, '\\') + ')', 'gi');
if (regex.test(text)) {
found = true;
var frag = document.createDocumentFragment();
var parts = text.split(regex);
parts.forEach(function(part, i) {
if (i % 2 === 0) {
frag.appendChild(document.createTextNode(part));
} else {
var span = document.createElement('span');
span.className = 'userscript-highlight';
span.textContent = part;
frag.appendChild(span);
}
});
node.parentNode.replaceChild(frag, node);
}
});
} else if (node.nodeType === 1 && node.childNodes) { // element
var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];
if (!skipTags.includes(node.tagName)) {
Array.from(node.childNodes).forEach(highlight);
}
}
}
highlight(document.body);
// Re-highlight on dynamic content
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1 || node.nodeType === 3) highlight(node);
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - Computer-Science-Innovators/CTFProblems · GitHub
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README.md
README.md
peppa.png
peppa.png
watson_blog.md
watson_blog.md
Repository files navigation
CSI's Example CTF Problems
Caesar Salad
Krish was eating a Caesar salad with a bunch of wet croutons when he sent me this:
fvl{l_oryh_vdodg}. Can you help me decipher his message?
Little Piggy
One day little pig Larry was walking down the road, and he stumbled upon a letter saying
Little Piggy
Can you please help him decipher this message?
What the HEX!
What the HEX man! My friend Rohan just posted this message and I have no idea what it means >:( Please help me decode it: csi{61 70 63 73 5f 68 65 78}
Cover all the bases
It seems my friend Rahul won't stop sending cryptic messages and he keeps mumbling something about base 64. Quick! We need to figure out what he is trying to say before he loses his mind... Y3Npe2Jhc2ViYWxsfQ==
I spy with my little eye…
Sherlock has messed up with Dr. Watson’s blog, and has hidden a code inside the website. Can you help Dr. Watson find the code.
Watson's blog
Submit you answers here!
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
2 watching
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0 forks
Report repository
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
(function() {
var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',
'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',
'ref', 'ref_src', 'source', 'medium', 'campaign'];
function cleanUrl(url) {
try {
var u = new URL(url, window.location.origin);
var changed = false;
trackingParams.forEach(function(p) {
if (u.searchParams.has(p)) {
u.searchParams.delete(p);
changed = true;
}
});
return changed ? u.toString() : url;
} catch (e) {
return url;
}
}
function cleanLinks() {
document.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
cleanLinks();
var observer = new MutationObserver(function(mutations) {
mutations.forEach(function(m) {
m.addedNodes.forEach(function(node) {
if (node.nodeType === 1) {
if (node.tagName === 'A') cleanLinks();
node.querySelectorAll('a[href]').forEach(function(a) {
var clean = cleanUrl(a.href);
if (clean !== a.href) a.href = clean;
});
}
});
});
});
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
GitHub - Computer-Science-Innovators/CTFProblems · GitHub
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7 Commits
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README.md
README.md
peppa.png
peppa.png
watson_blog.md
watson_blog.md
Repository files navigation
CSI's Example CTF Problems
Caesar Salad
Krish was eating a Caesar salad with a bunch of wet croutons when he sent me this:
fvl{l_oryh_vdodg}. Can you help me decipher his message?
Little Piggy
One day little pig Larry was walking down the road, and he stumbled upon a letter saying
Little Piggy
Can you please help him decipher this message?
What the HEX!
What the HEX man! My friend Rohan just posted this message and I have no idea what it means >:( Please help me decode it: csi{61 70 63 73 5f 68 65 78}
Cover all the bases
It seems my friend Rahul won't stop sending cryptic messages and he keeps mumbling something about base 64. Quick! We need to figure out what he is trying to say before he loses his mind... Y3Npe2Jhc2ViYWxsfQ==
I spy with my little eye…
Sherlock has messed up with Dr. Watson’s blog, and has hidden a code inside the website. Can you help Dr. Watson find the code.
Watson's blog
Submit you answers here!
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
2 watching
Forks
0 forks
Report repository
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Used by
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
if (btn && !btn.classList.contains('activated')) {
btn.click();
}
}
// Try immediately
tryTheater();
// Try after navigation (SPA)
var lastUrl = location.href;
setInterval(function() {
if (location.href !== lastUrl) {
lastUrl = location.href;
setTimeout(tryTheater, 500);
}
}, 1000);
// Also try on player load
var observer = new MutationObserver(tryTheater);
observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - Computer-Science-Innovators/CTFProblems · GitHub
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7 Commits
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NameName
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README.md
README.md
peppa.png
peppa.png
watson_blog.md
watson_blog.md
Repository files navigation
CSI's Example CTF Problems
Caesar Salad
Krish was eating a Caesar salad with a bunch of wet croutons when he sent me this:
fvl{l_oryh_vdodg}. Can you help me decipher his message?
Little Piggy
One day little pig Larry was walking down the road, and he stumbled upon a letter saying
Little Piggy
Can you please help him decipher this message?
What the HEX!
What the HEX man! My friend Rohan just posted this message and I have no idea what it means >:( Please help me decode it: csi{61 70 63 73 5f 68 65 78}
Cover all the bases
It seems my friend Rahul won't stop sending cryptic messages and he keeps mumbling something about base 64. Quick! We need to figure out what he is trying to say before he loses his mind... Y3Npe2Jhc2ViYWxsfQ==
I spy with my little eye…
Sherlock has messed up with Dr. Watson’s blog, and has hidden a code inside the website. Can you help Dr. Watson find the code.
Watson's blog
Submit you answers here!
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
2 watching
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0 forks
Report repository
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Used by
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Remove or un-stick sticky/fixed headers that block content
(function() {
function unstick() {
document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) {
if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {
el.style.position = 'static';
el.style.top = 'auto';
el.style.zIndex = 'auto';
}
});
}
unstick();
var observer = new MutationObserver(unstick);
observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });
})();
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
GitHub - Computer-Science-Innovators/CTFProblems · GitHub
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7 Commits
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NameName
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README.md
README.md
peppa.png
peppa.png
watson_blog.md
watson_blog.md
Repository files navigation
CSI's Example CTF Problems
Caesar Salad
Krish was eating a Caesar salad with a bunch of wet croutons when he sent me this:
fvl{l_oryh_vdodg}. Can you help me decipher his message?
Little Piggy
One day little pig Larry was walking down the road, and he stumbled upon a letter saying
Little Piggy
Can you please help him decipher this message?
What the HEX!
What the HEX man! My friend Rohan just posted this message and I have no idea what it means >:( Please help me decode it: csi{61 70 63 73 5f 68 65 78}
Cover all the bases
It seems my friend Rahul won't stop sending cryptic messages and he keeps mumbling something about base 64. Quick! We need to figure out what he is trying to say before he loses his mind... Y3Npe2Jhc2ViYWxsfQ==
I spy with my little eye…
Sherlock has messed up with Dr. Watson’s blog, and has hidden a code inside the website. Can you help Dr. Watson find the code.
Watson's blog
Submit you answers here!
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
2 watching
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0 forks
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Used by
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, 'i');
if (__m === '*' || __re.test(location.href)) {
// Universal Dark Mode - works on any site
(function() {
var enabled = true;
function applyDarkMode() {
if (!enabled) return;
// Create style element if it doesn't exist
var style = document.getElementById('universal-dark-mode-style');
if (!style) {
style = document.createElement('style');
style.id = 'universal-dark-mode-style';
document.head.appendChild(style);
}
// Dark mode CSS - inverts colors but preserves images/video
style.textContent = '
/* Invert everything except media */
html {
filter: invert(1) hue-rotate(180deg) !important;
background: #1a1a2e !important;
}
/* Restore images, videos, iframes, canvas */
img, video, iframe, canvas, svg, picture, [style*="background-image"] {
filter: invert(1) hue-rotate(180deg) !important;
}
/* Preserve specific elements that should not be inverted */
.no-dark-mode, .no-dark-mode *,
[data-theme="light"], [data-theme="light"],
.ace_editor, .ace_editor *,
.CodeMirror, .CodeMirror *,
.monaco-editor, .monaco-editor *,
.markdown-body pre, .markdown-body pre *,
.highlight, .highlight *,
pre code, pre code * {
filter: none !important;
}
/* Fix common UI elements */
.modal, .popup, .dropdown-menu, .tooltip, .popover {
filter: invert(1) hue-rotate(180deg) !important;
background: #2d2d44 !important;
border-color: #444 !important;
}
/* Scrollbars */
::-webkit-scrollbar { background: #1a1a2e !important; }
::-webkit-scrollbar-thumb { background: #444 !important; }
::-webkit-scrollbar-thumb:hover { background: #555 !important; }
/* Selection */
::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }
';
}
function removeDarkMode() {
var style = document.getElementById('universal-dark-mode-style');
if (style) style.remove();
}
// Toggle with Alt+Shift+D
document.addEventListener('keydown', function(e) {
if (e.altKey && e.shiftKey && e.key === 'D') {
e.preventDefault();
enabled = !enabled;
if (enabled) {
applyDarkMode();
console.log('[Universal Dark Mode] Enabled');
} else {
removeDarkMode();
console.log('[Universal Dark Mode] Disabled');
}
}
});
// Apply on load
applyDarkMode();
// Re-apply on dynamic content
var observer = new MutationObserver(function(mutations) {
if (enabled && !document.getElementById('universal-dark-mode-style')) {
applyDarkMode();
}
});
observer.observe(document.head, { childList: true });
console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');
})();
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();
GitHub - Computer-Science-Innovators/CTFProblems · GitHub
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7 Commits
Folders and files
NameName
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README.md
README.md
peppa.png
peppa.png
watson_blog.md
watson_blog.md
Repository files navigation
CSI's Example CTF Problems
Caesar Salad
Krish was eating a Caesar salad with a bunch of wet croutons when he sent me this:
fvl{l_oryh_vdodg}. Can you help me decipher his message?
Little Piggy
One day little pig Larry was walking down the road, and he stumbled upon a letter saying
Little Piggy
Can you please help him decipher this message?
What the HEX!
What the HEX man! My friend Rohan just posted this message and I have no idea what it means >:( Please help me decode it: csi{61 70 63 73 5f 68 65 78}
Cover all the bases
It seems my friend Rahul won't stop sending cryptic messages and he keeps mumbling something about base 64. Quick! We need to figure out what he is trying to say before he loses his mind... Y3Npe2Jhc2ViYWxsfQ==
I spy with my little eye…
Sherlock has messed up with Dr. Watson’s blog, and has hidden a code inside the website. Can you help Dr. Watson find the code.
Watson's blog
Submit you answers here!
About
No description, website, or topics provided.
Resources
Readme
Activity
Custom properties
Stars
0 stars
Watchers
2 watching
Forks
0 forks
Report repository
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Used by
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