{"enrichment":{"faq":[{"a":"ctf-crypto guides you through systematic investigation of cryptographic implementations in compiled binaries. It helps you detect encryption routines, identify algorithm types (standard like AES/RSA or custom ciphers), trace key sources, and locate implementation weaknesses. By combining binary analysis with cryptanalysis techniques, ctf-crypto enables you to recover plaintext, extract hardcoded keys, or break weak schemes to capture flags.","q":"How does ctf-crypto help solve CTF crypto challenges?"},{"a":"ctf-crypto teaches you to recognize cryptographic patterns in compiled code: look for characteristic S-boxes, key schedules, and algorithm-specific constants. Search for standard library calls (OpenSSL, libgcrypt) or custom cipher loops. Examine memory operations, XOR chains, and substitution patterns. ctf-crypto helps you correlate these signatures with known algorithms or flag custom implementations for deeper analysis.","q":"How can I identify encryption in binary files using ctf-crypto?"},{"a":"ctf-crypto covers key extraction by tracing initialization routines, identifying where keys are stored in memory or data sections, and recognizing weak key derivation. It shows how to spot hardcoded strings, static buffers, and predictable key generation. You'll learn to exploit poor key management\u2014keys embedded in .rodata, derived from weak RNG, or passed as constants\u2014to recover encryption material and decrypt protected data.","q":"What techniques does ctf-crypto cover for extracting hardcoded keys?"},{"a":"ctf-crypto teaches you to document custom cipher logic by tracing encryption loops, identifying substitution and permutation operations, and mapping data flow. You'll recognize patterns like Feistel networks, byte-level transformations, and key mixing. By reconstructing the algorithm's behavior from assembly, ctf-crypto helps you build a cryptanalytic model to find weaknesses\u2014weak diffusion, predictable round keys, or reused constants\u2014and break the scheme.","q":"How does ctf-crypto help reverse engineer custom ciphers?"},{"a":"ctf-crypto highlights common flaws: ECB mode (identical plaintext blocks produce identical ciphertext), weak RNG for key or IV generation, hardcoded keys, insufficient key derivation, and custom ciphers with poor diffusion or key schedules. It teaches you to recognize these patterns in binaries and apply targeted attacks\u2014frequency analysis, known-plaintext recovery, or brute-force on weak key spaces\u2014to decrypt data or recover flags.","q":"What implementation weaknesses can ctf-crypto help me exploit?"},{"a":"Yes. ctf-crypto teaches you to spot standard cryptographic algorithms by their implementation signatures: AES S-boxes and key expansion routines, RSA modular exponentiation and padding schemes, and hash function constants. You'll learn to identify library calls and algorithm-specific memory patterns. Once recognized, ctf-crypto guides you to extract keys, find configuration weaknesses, or leverage known attacks on the implementation.","q":"Can ctf-crypto help me recognize AES, RSA, and other standard algorithms in compiled code?"}],"shadow_tags":["binary-cryptanalysis","weak-implementations","key-recovery","cipher-identification","reverse-engineering","implementation-flaws","ctf-exploitation","custom-ciphers","crypto-patterns","flag-extraction"],"summary_rewrite":"CTF Crypto helps you investigate cryptographic implementations embedded in compiled binaries through systematic detection, algorithm identification, and weakness analysis. Trace key sources, recognize standard algorithms and custom ciphers, and exploit implementation flaws to recover plaintext or extract keys."},"files":[{"bytes":12160,"path":"ReVa/skills/ctf-crypto/SKILL.md","sha256":"c0cb1f2d230c69153c2e94a8ccc69b22a65a40550ee8bdf88e94c44680bbca2c","url":"https://skillfed.io/files/cyberkaida/reverse-engineering-assistant/ctf-crypto/86e6939a/SKILL.md"}],"id":"cyberkaida/reverse-engineering-assistant/ctf-crypto","links":{"html":"https://skillfed.io/cyberkaida/reverse-engineering-assistant/ctf-crypto","md":"https://skillfed.io/cyberkaida/reverse-engineering-assistant/ctf-crypto.md","repo":"https://github.com/cyberkaida/reverse-engineering-assistant"},"meta":{"agents_supported":[],"first_seen":"2026-07-28","forks":68,"language":"Java","last_updated":"2026-07-21","license":"Apache-2.0","name":"ctf-crypto","publisher":"cyberkaida","stars":792},"relations":{"similar":[{"id":"cyberkaida/reverse-engineering-assistant/ctf-rev"},{"id":"ljagiello/ctf-skills/ctf-crypto"},{"id":"martinholovsky/claude-skills-generator/encryption"},{"id":"cyberkaida/reverse-engineering-assistant/deep-analysis"},{"id":"yaklang/hack-skills/classical-cipher-analysis"},{"id":"hypnguyen1209/offensive-claude/crypto-analysis"},{"id":"yaklang/hack-skills/symmetric-cipher-attacks"},{"id":"ljagiello/ctf-skills/solve-challenge"},{"id":"ljagiello/ctf-skills/ctf-reverse"},{"id":"yaklang/hack-skills/rsa-attack-techniques"}]},"slug":{"owner":"cyberkaida","repo":"reverse-engineering-assistant","skill":"ctf-crypto"},"version":"86e6939a"}