CTF Challenges

Analyze Windows registry files to find evidence and the flag.

Use web archives to find deleted or changed content containing the flag.

Reverse engineer a custom network protocol to communicate with a server.

Extract metadata from a PDF file to find the flag.

A custom ROT cipher has been used. Find the rotation value and decrypt.

Create a timeline of events from system logs to find when the flag was accessed.

Track a flight using public flight data to find the flag.

Bypass anti-debugging techniques in a binary to analyze it.

Execute a program written in the Whitespace programming language.

Exploit a race condition in the payment processing system to get free items.

Exploit a padding oracle vulnerability in CBC mode to decrypt the flag.

Carve files from a disk image to find hidden data and the flag.

Research a company using public records and find hidden information.

Reverse engineer Python bytecode to recover the original source and flag.

Find the flag hidden in a DNS TXT record.

Exploit XML External Entity processing to read sensitive files from the server.

Decrypt a message encrypted with Vigenère cipher. The key is a common word.

A ZIP file is password protected. Crack the password to extract the flag.

Find information about a phone number and locate the flag.

Extract and analyze firmware to find hardcoded credentials and the flag.

A file that is valid in multiple formats. Extract data from each format.

Exploit a Server-Side Request Forgery vulnerability to access internal services.

Intercept and exploit a weak Diffie-Hellman key exchange to recover the shared secret.

Analyze server logs to find evidence of an attack and the flag.

Find all accounts associated with a username across different platforms.

Analyze a malware sample in a safe environment to understand its behavior.

Find a message hidden using Unicode zero-width characters.

A JWT token is used for authentication. Can you forge a token to gain admin access?

AES in ECB mode has been used. Exploit the weakness to decrypt the flag.

A message is hidden in an image using LSB steganography. Extract it.

Investigate an email address to find associated accounts and the flag.

Analyze an Android APK file to find hardcoded secrets and the flag.

Analyze an audio file's spectrogram to find a hidden message.

Upload a malicious file to gain remote code execution on the server.

Find two different messages that produce the same MD5 hash.

Analyze a memory dump to find passwords and the flag.

Find the exact location where a photo was taken using metadata and visual clues.

Deobfuscate JavaScript code to understand its functionality and find the flag.

Scan a barcode to reveal the flag.

Solve string manipulation problems to extract the flag.

Find a way to bypass CSRF protection and perform unauthorized actions.

A message has been encrypted using XOR. Find the key and decrypt it.

A flag is hidden in the metadata of an image file. Extract it.

Use reverse image search to find the original source and the flag.

Unpack and analyze a packed binary to find the flag.

Run a Brainfuck program to get the flag output.

Implement BFS or DFS to traverse a graph and find the flag.

A comment system is vulnerable to XSS. Inject a script to steal admin cookies.

A weak RSA key has been used. Factor the modulus and decrypt the message.

Analyze a network capture file to find the flag hidden in the traffic.

Use WHOIS data to find information about a domain and locate the flag.

Reverse engineer a simple crackme program to find the correct password.

Scan multiple QR codes to piece together the flag.

Solve a classic dynamic programming problem to get the flag.

A vulnerable login form is waiting for you. Can you bypass authentication using SQL injection?

A secret message has been encoded multiple times. Decode it to find the flag.

A file was deleted from a disk image. Recover it to find the flag.

Find information about a target using only publicly available social media data.

Analyze a binary file to find readable strings and the flag.

Decode a Morse code message to find the flag.

Implement a binary search algorithm to find the flag.

A fintech startup is getting strange login attempts. Investigate the login endpoint and find the vulnerability.

A suspicious tea shop server has been compromised. Use the terminal interface to investigate the system and find all hidden flags.

Decrypt this message to find the flag. The encryption method is simple.

Solve this coding challenge related to array operations.