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This skill analyzes the cryptographic algorithms, key management systems, and file encryption routines employed by various ransomware families. It covers hybrid schemes like AES-RSA and modern ciphers such as ChaCha20. Use this when assessing data recovery feasibility, reverse engineering ransomware binaries, identifying implementation weaknesses (e.g., IV reuse, key derivation flaws), or developing custom decryptor tools.

This skill covers implementing robust API abuse detection using advanced rate-limiting algorithms like Token Bucket and Sliding Window. It uses Redis for distributed counting and allows for adaptive limits, dynamically tightening during detected attacks and relaxing during normal traffic. Ideal for securing APIs against DDoS, brute force, and scraping attacks.

Details how to implement robust API rate limiting and throttling using advanced techniques like Token Bucket, Sliding Window, and Fixed Window algorithms. Supports per-user, per-IP, and per-endpoint quotas, utilizing Redis for distributed counting. Essential for protecting APIs against brute force, credential stuffing, and resource exhaustion attacks, returning proper HTTP 429 responses.

This skill covers the implementation of Ed25519 digital signatures, a high-performance algorithm utilizing the Curve25519 structure. It details key pair generation, message signing, and signature verification. Ed25519 offers superior performance, determinism, and side-channel resistance compared to RSA and ECDSA. Use this skill for establishing robust authentication, ensuring data integrity, and securing system components like code or APIs.

This skill implements a simplified version of the Signal Protocol, focusing on robust end-to-end encryption (E2EE) for messaging applications. It covers critical cryptographic components including X3DH key agreement, the Double Ratchet algorithm for continuous key management, and AES-256-GCM for message encryption. The implementation ensures forward secrecy, meaning that compromising a current key does not reveal past messages. Use this when designing, building, or evaluating the security architecture of a messaging service to guarantee that only communicating parties can read the messages.

This skill provides comprehensive implementation for secure JWT (RFC 7519) signing and verification using multiple algorithms (HMAC-SHA256, RSA-PSS, ES256, EdDSA). It covers token expiration, claims validation, and crucial defenses against common attacks like algorithm confusion and 'none' algorithm bypass, essential for hardening web application authentication systems.

This skill provides a systematic cryptographic audit tool designed to review applications for security vulnerabilities. It scans source code and configuration files to detect weak hashing algorithms (MD5, SHA-1), insecure cipher modes (ECB), hardcoded secrets, and deprecated protocols like TLS 1.0. Essential for security assessments, compliance checks, and maintaining secure coding practices.

A specialized tool for authorized penetration testing and security assessments. It exploits the vulnerability of JWT libraries that accept tokens with the "alg": "none" header, bypassing cryptographic signature verification. Users can craft tokens with arbitrary claims (e.g., elevated privileges, impersonation) to validate that a target server correctly rejects unsigned JSON Web Tokens.

A generic, type-safe in-memory caching library for Go (Go 1.22+). It offers advanced features like nine specialized eviction algorithms (LRU, LFU, W-TinyLFU), Time-To-Live (TTL), read-through loaders, and Prometheus metrics. This skill helps developers design robust caching layers, optimize performance by selecting the correct eviction policy based on access patterns, and manage cache capacity effectively.

Qiskit is a Python framework for building, simulating, and executing quantum circuits. It supports local simulation, noisy simulation, and IBM Quantum hardware execution. Users can utilize V2 primitives like Sampler and Estimator for variational algorithms and quantum machine learning tasks.

This utility helps manage API rate limits when building parallel integrations with multiple financial providers (Gusto, QuickBooks, Plaid, Stripe). It implements a token bucket algorithm and robust retry strategies to prevent shared-limit conflicts and ensure reliable data synchronization during high-volume processes like month-end reconciliation.

A comprehensive checklist detailing advanced attack methodologies for JSON Web Tokens (JWT). Covers critical misconfigurations such as algorithm confusion (alg:none, RS256→HS256), weak secret brute forcing, header injection (kid, jku, jwk), cache poisoning, and improper validation. Also provides specific vectors for extracting JWTs from mobile environments (Android/iOS). Ideal for penetration testers conducting deep security assessments on authentication systems.