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Free, browser-based digital authenticity toolkit (GPL-2.0). Watermark images (9 algorithms), audio (8) and documents (5); compute 21 fingerprint hashes; sign and verify C2PA provenance; issue Ed25519/P-256/RSA DID keys; generate PDF/DOCX/EPUB certificates; forensic ELA/noise/JPEG-marker analysis. Vanilla JS, no framework, runs fully client-side. Not a full PDF editor - watermarking, provenance and verification only.
Features
- C2PA provenance signing and verification (ECDSA + CBOR COSE Sign1)
- Decentralized Identity (Ed25519, ECDSA P-256, RSA key gen, sign/verify)
- Certificate generation (PDF, DOCX, EPUB) and OpenTimestamps create/verify/upgrade
- Forensic analysis (ELA, noise, JPEG markers) and metadata (EXIF) reader
- CLI (12 commands) and 20 standalone MPA tool pages; 8 languages (ar, de, en, es, fr, ja, ko, zh)
- 21 fingerprint hashes (SHA family, SHA-3, MD, BLAKE, RIPEMD, Whirlpool, perceptual)
- 9 image watermark algorithms (LSB, DCT, Zero-bit, Fragile, Neural SS, Multi-bit, Patchwork, Adaptive, Statistical)
- 8 audio watermark algorithms (LSB, Phase Coding, Echo Hiding, DSSS, QIM, DWT Haar, Patchwork, DCT)
- 5 document watermark techniques (Whitespace, ZWC, Synonym, Line-shift, Word-shift)
Categories
SecurityLicense
GNU General Public License version 2.0 (GPLv2)Follow RedoSan-Authenticity
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