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Security Focus - Search vulnerabilties by CVE or by Vendor/Version
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Exploit DB - Exploits Database by Offensive Security
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Siphon - Exploits, Dumps, Leaks, Papers, Hashes
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Preparing for CTF - Tools and Resources to Prepare for a Hacker CTF Competition or Challenge
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Hack This Site! - Ethical Hacking Practice
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cryptii - The ultimate decoder. Put your plaintext or ciphertext through a series of decoding steps. Includes morse code, base64, caeser cipher, ROT13, Enigma, and many more
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quipqiup - cryptogram solver
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Cipher Tools - List of cipher decoders/decrypters
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Decoder - Base64, MD5, SHA1, SHA256, etc
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Encoder / Decoder - A tool to help in breaking codes
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CyberChef - Analyzes and decodes data (data formats, compression, and encryption)
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CrackStation - Password Hash Cracker
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Image Steganography - Hide images inside other images
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Steganography Tools - Encode an image, Decode an image, Compare two images
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hackme - Deconstructing an ELF file
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File Checker - Check File Type
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Binary Ninja - software - A reserve engineering tool (software)
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IDA - software - IDA is a Windows, Linux or Mac OS X hosted multi-processor disassembler and debugger...etc
- Virus Total - Upload file, search URL, domain, IP, or hash. Get network information, signatures, malware classification, etc
- Packet Analysis - Upload pcaps and get summaries of connections, malicious activity, connection timelines, etc
- Wireshark - Examine & Analyze pcaps, or capture packets on an interface near you