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mukul975
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Complete skill folder anatomy across all cybersecurity skills: - scripts/agent.py: 80-150 line Python agents using real libraries (impacket, boto3, azure-mgmt-*, kubernetes, pefile, yara, scapy, shodan, stix2, etc.) - references/api-reference.md: real API documentation with method signatures - LICENSE: MIT license for all skill folders
34 lines
1.4 KiB
Markdown
34 lines
1.4 KiB
Markdown
---
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name: implementing-log-integrity-with-blockchain
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description: >-
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Build an append-only log integrity chain using SHA-256 hash chaining for tamper detection.
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Each log entry is hashed with the previous entry's hash to create a blockchain-like structure
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where modifying any entry invalidates all subsequent hashes. Implements log ingestion,
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chain verification, tamper detection with pinpoint identification, and periodic checkpoint
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anchoring to external timestamping services.
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---
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## Instructions
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1. Install dependencies: `pip install requests`
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2. Ingest log entries from syslog, JSON, or plain text files.
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3. For each entry, compute SHA-256 hash of: previous_hash + timestamp + log_content.
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4. Store the chain as a JSON ledger with entry index, timestamp, content hash, previous hash, and chain hash.
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5. Verify chain integrity by recomputing all hashes and detecting breaks.
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6. Optionally anchor checkpoint hashes to an external timestamping service.
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```bash
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python scripts/agent.py --log-file /var/log/syslog --chain-file log_chain.json --verify --output integrity_report.json
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```
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## Examples
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### Chain Entry Structure
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```json
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{"index": 42, "timestamp": "2024-01-15T10:30:00Z", "content_hash": "a1b2c3...",
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"prev_hash": "d4e5f6...", "chain_hash": "SHA256(prev_hash + timestamp + content_hash)"}
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```
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### Tamper Detection
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If entry 42 is modified, chain_hash[42] will not match SHA256(chain_hash[41] + ...), and all entries from 42 onward will be flagged as invalid.
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