Rutvij Khatri6 min read
How to Detect Photoshopped Images Using Error Level Analysis (ELA)
Learn how JPEG quantization tables and compression error deltas expose digital image tampering, airbrushed textures, and copy-move forgeries.
Tactical tutorials, mathematical explanations, and investigation playbooks for digital forensics examiners, OSINT researchers, and investigative journalists.
Learn how JPEG quantization tables and compression error deltas expose digital image tampering, airbrushed textures, and copy-move forgeries.
A tactical forensic guide for fraud investigators and compliance teams on uncovering modified amounts, forged signatures, and spliced contract terms.
Understand the core differences between compression-based Error Level Analysis and sensor pattern noise analysis to avoid common investigative pitfalls.
Discover how Least Significant Bit (LSB) steganography embeds ASCII messages inside digital pixels and how to decode them in browser memory.
A deep dive into isolating color channels and bit depths 0 through 7 to uncover hidden digital watermarks, covert channels, and secondary images.
How threat actors conceal Command & Control (C2) instructions and malware loaders inside innocent profile pictures and web banners.
Learn how polyglot files conceal archives past standard image EOF markers (FF D9) and how to carve them losslessly in your browser.
Uncovering developer paths, internal URLs, author emails, and base64 strings hidden within image binary headers.
A technical breakdown of dual-format polyglot files that validate as standard images while executing as scripts or archives.
How to extract high-precision GPS coordinates, altitude, and camera angles from photographs, and how to verify location authenticity.
How open-source investigators and forensic analysts link disputed photos to specific camera bodies and lenses using hardware serial tags.
An empirical analysis of what metadata platforms like X, Facebook, and Instagram remove, and what digital fingerprints survive re-encoding.
Use 2D Sobel luminance vector gradients to verify whether all subjects and shadows in a photograph converge toward the same light source.
How second-order spatial convolution highlights artificial sharpening seams, cut-out borders, and digital brush smoothing.
Why converting RGB images into separated luminance and chrominance color spaces exposes manipulation concealed by human visual perception.
A multi-engine investigation framework comparing Google Lens, Yandex, Bing Visual, and TinEye for tracking photo origins and facial attribution.
Understand how Discrete Cosine Transform (DCT) perceptual fingerprints survive compression, resizing, and color grading where MD5 and SHA-256 fail.
A practical, actionable playbook for photographers, artists, and creators to detect unauthorized usage and preserve forensic evidence.
A complete step-by-step walkthrough on how CTF challenge authors hide flags by cropping IHDR height, and how to recover the original dimensions in milliseconds.
Deep dive into ancillary PNG chunks (tEXt, zTXt, iTXt, pHYs) and how attackers embed metadata, covert channels, and secondary data.
How to inspect and extract hidden payloads from PNG textual and physical metadata chunks during digital forensics investigations.
Learn how to solve dual-image visual cryptography challenges by executing bitwise XOR, absolute difference, and channel subtraction in your browser.
A visual methodology for cracking single-byte XOR image ciphers (keys 0x01 through 0xFF) using real-time canvas scrubbing.
How absolute difference (|A - B|) with multi-scale amplification exposes micro-adjustments and invisible watermarks.
A practical guide on analyzing file headers in a hex editor, recognizing secondary container markers, and restoring wiped file signatures.
Comprehensive reference table of magic bytes, container markers, and EOF delimiters for JPEG, PNG, GIF, WebP, BMP, and TIFF.
Techniques used by incident response teams to reconstruct file headers manipulated by threat actors to evade network inspection.
Learn how penetration testers evaluate image upload filters and how application security teams enforce strict re-encoding and sandboxing.
Why SVG is an XML document capable of executing JavaScript, and how to safely sanitize vector uploads using DOMPurify and strict CSP.
How threat actors hide PHP and ASP command execution stubs inside valid image files and how security teams scan for them.
How tiny 50KB image files expand to 6+ Gigabytes of RAM during decompression and how infrastructure teams prevent OOM server crashes.
Production-ready configuration files and security policies to restrict memory, execution limits, and disk mapping in production pipelines.
An architectural breakdown of heap allocation, worker thread concurrency, and Linux OOM killer triggers caused by pixel floods.
Step-by-step forensic tutorial on Otsu adaptive binarization, white-on-black color inversion, and morphological scratch repair.
How threat actors use QR codes to bypass corporate email gateways, and how security analysts decode and analyze destination URLs.
A technical guide on optical pre-processing, 4-point perspective unwarping, and morphological closing for physical evidence extraction.