Post-Quantum Cryptography — Digital Evidence Integrity System

🔍 Evidence Hashing WebCrypto SHA-256 / SHA-384 / SHA-512

Cryptographic Evidence Hashing: Browser's WebCrypto API computes mathematically secure hash fingerprints — the same standard used by law enforcement agencies and government forensic laboratories worldwide.

Evidence Content (text ya data) Hash Algorithm

Hash Output (Real Cryptographic Hash)

Hash yahan aayega...

Hash Details

Compute karo pehle...

Hex Bytes View

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🔄 Tamper Detection — Hash Integrity Comparison SHA-256 Verified

Compare two evidence strings using cryptographic hashing. Even a single character modification produces a completely different hash — demonstrating evidence integrity verification.

Original Evidence

Suspect Evidence (thoda sa change karo)

✍️ ECDSA Digital Signature Authentication WebCrypto ECDSA P-256

Industry-Standard Digital Signatures: ECDSA P-256 keys are generated using the browser's WebCrypto API — the same algorithm currently used in courts for evidence authentication. In a post-quantum system, this will be replaced by CRYSTALS-Dilithium3 (FIPS 204).

Key Generate Karo

Evidence Sign Karo

Verify Karo

Tamper Detect

Step 1 — Key Pair Generation

Public Key (Evidence Verifier ke liye)

Key generate karo pehle...

Private Key (Sirf signing officer ke paas)

Key generate karo pehle...

Step 2 — Evidence Signing

Evidence Data (jo sign karna hai)

Digital Signature (Real Cryptographic Signature)

Pehle keys generate karo...

Step 3 — Verify & Tamper Detection

Evidence to Verify (original ya modified)

🔒 AES-256-GCM Evidence Encryption WebCrypto AES-256-GCM

Military-Grade Encryption Standard: AES-256-GCM is the encryption standard approved for classified government documents by NSA and adopted by law enforcement agencies globally. GCM mode provides both confidentiality and authenticity verification.

🔒 Encrypt Evidence

Evidence Data (plaintext) Encryption Password / Key (yaad rakhna!)

Encrypted Output (Ciphertext)

Encrypt karo pehle...

IV / Salt (Decryption ke liye zaroori)

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🔓 Decrypt Evidence

Encrypted Ciphertext (paste karo) IV Value (upar se copy karo) Password (same jo encrypt mein tha)

Decrypted Plaintext

Decrypt karo pehle...

PQC Integration: In a production post-quantum system, the AES-256 encryption key is protected using CRYSTALS-Kyber-768 KEM (FIPS 203) instead of a password. This hybrid approach — AES-256 for data confidentiality, Kyber-768 for quantum-resistant key encapsulation — is the recommended NIST migration strategy.

🔗 Digital Evidence Chain of Custody SHA-256 Hash Chain Verification

Cryptographic Chain of Custody: Each custody transfer generates a real SHA-256 hash. Any tampering at any stage breaks the chain — providing mathematically provable evidence integrity for court admissibility.

Evidence Base Data

Build karo pehle...

⚛️ Post-Quantum Cryptography Algorithm Suite NIST FIPS 203-206 — Browser Native Support Pending

Why Simulated? CRYSTALS-Dilithium, Kyber-768, and FALCON are not yet natively supported in browser WebCrypto APIs (expected 2025-2026). For production PQC, Python/liboqs or OpenSSL 3.x with OQS provider is required. This module demonstrates accurate key sizes, signature structures, and workflows as defined in NIST FIPS 203-206.

PQC Algorithm Select Karo Evidence Data

Simulated Public Key

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Simulated Signature

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Algorithm Stats

Select algo and generate...

📊 Classical vs Post-Quantum Algorithm Comparison

Algorithm	Public Key	Signature	Quantum Safe	Status
ECDSA P-256	64 bytes	72 bytes	❌ NO	DEPRECATED
Dilithium3	1,952 bytes	3,293 bytes	✅ YES	FIPS 204
FALCON-512	897 bytes	~666 bytes	✅ YES	FIPS 206
SPHINCS+-256s	64 bytes	49,856 bytes	✅ YES	FIPS 205
Kyber-768	1,184 bytes	1,088 bytes (CT)	✅ YES	FIPS 203

🖥️ Operation Log

// Post-Quantum Cryptography — Digital Evidence Integrity System // SHA-256 | ECDSA P-256 | AES-256-GCM — WebCrypto API (Production Grade) // Dilithium3 | Kyber-768 | FALCON — NIST FIPS 203-206 (Simulated) pqc-evidence-system:~$ _