crypto-analysis

name	crypto-analysis
description	Use when assessing cryptography — TLS/PKI auditing, RSA/ECC key attacks, ECDSA nonce lattice recovery, symmetric/AEAD misuse, JWT/JOSE forgery, hash cracking, post-quantum migration review
metadata	{"type":"offensive","phase":"analysis","tools":"testssl.sh, openssl, hashcat, john, RsaCtfTool, sagemath, jwt_tool, ecdsa-lattice","mitre":["T1600","T1600.001","T1557","T1110.002","T1552.004","T1606.001","T1040"]}
kill_chain	{"phase":["recon","exploit"],"step":[1,4],"attck_tactics":["TA0043","TA0006","TA0009"],"attck_techniques":["T1600","T1600.001","T1557","T1557.001","T1110.002","T1552.004","T1606.001","T1040"]}
depends_on	["recon-osint"]
feeds_into	["exploit-development","web-pentest","network-attack"]
inputs	["tls_config","crypto_implementation","hash_samples","public_keys","jwt_tokens","signature_corpus"]
outputs	["crypto_weakness_report","finding_record","recovered_keys","cracked_credentials"]
references	["references/tls-pki-audit.md","references/rsa-attacks.md","references/ecc-nonce-attacks.md","references/symmetric-aead.md","references/jwt-jose.md","references/hash-pq.md"]
scripts	["scripts/tls_audit.py","scripts/rsa_attack.py","scripts/ecdsa_lattice.py","scripts/padding_oracle.py","scripts/gcm_nonce_reuse.py","scripts/jwt_forge.py","scripts/hash_triage.py"]

Cryptographic Analysis

When to Activate

• Auditing TLS/SSL/SSH configurations and X.509 PKI (cipher suites, downgrade, protocol flaws)
• Reviewing crypto implementations in source code or captured traffic
• Attacking weak RSA/ECC keys (CTF and real-world weak-key hygiene)
• Recovering ECDSA/DSA private keys from reused or biased nonces (lattice/HNP)
• Exploiting symmetric/AEAD misuse: padding oracles, GCM nonce reuse, key-commitment
• Forging JWT/JOSE tokens (algorithm confusion, none, jwk/jku/kid injection)
• Cracking password hashes and grading KDF strength
• Assessing post-quantum readiness ("harvest now, decrypt later" exposure)

Technique Map

Technique	ATT&CK	CWE	Reference	Script
TLS cipher/protocol downgrade audit	T1600.001	CWE-326	references/tls-pki-audit.md	scripts/tls_audit.py
Terrapin SSH prefix truncation (CVE-2023-48795)	T1557	CWE-222	references/tls-pki-audit.md	scripts/tls_audit.py
Marvin/Bleichenbacher RSA timing oracle	T1600	CWE-208	references/tls-pki-audit.md	scripts/tls_audit.py
X.509 / CT-log shadow-asset discovery	T1589	CWE-295	references/tls-pki-audit.md	scripts/tls_audit.py
RSA weak-key factoring (Fermat/Wiener/common-modulus)	T1600	CWE-326	references/rsa-attacks.md	scripts/rsa_attack.py
Coppersmith partial-key & ROCA (CVE-2017-15361)	T1600	CWE-310	references/rsa-attacks.md	scripts/rsa_attack.py
Hastad broadcast / batch-GCD	T1600	CWE-326	references/rsa-attacks.md	scripts/rsa_attack.py
ECDSA nonce reuse key recovery	T1552.004	CWE-323	references/ecc-nonce-attacks.md	scripts/ecdsa_lattice.py
Biased-nonce lattice/HNP (Minerva, PuTTY CVE-2024-31497)	T1552.004	CWE-1241	references/ecc-nonce-attacks.md	scripts/ecdsa_lattice.py
Psychic signature (0,0) (CVE-2022-21449)	T1606.001	CWE-347	references/ecc-nonce-attacks.md	scripts/ecdsa_lattice.py
CBC padding oracle (byte-by-byte decrypt)	T1040	CWE-209	references/symmetric-aead.md	scripts/padding_oracle.py
AES-GCM nonce reuse "forbidden attack"	T1040	CWE-323	references/symmetric-aead.md	scripts/gcm_nonce_reuse.py
AEAD key-commitment / invisible salamanders / partitioning oracle	T1606	CWE-347	references/symmetric-aead.md	scripts/gcm_nonce_reuse.py
JWT algorithm confusion RS256→HS256 (CVE-2024-54150)	T1606.001	CWE-347	references/jwt-jose.md	scripts/jwt_forge.py
JWT alg=none / jwk / jku / kid injection	T1606.001	CWE-347	references/jwt-jose.md	scripts/jwt_forge.py
Hash identification & GPU cracking	T1110.002	CWE-916	references/hash-pq.md	scripts/hash_triage.py
Weak KDF / fast-hash password storage	T1110.002	CWE-916	references/hash-pq.md	scripts/hash_triage.py
Post-quantum / HNDL exposure review	T1600	CWE-327	references/hash-pq.md	scripts/tls_audit.py

Quick Start

# 0. TLS/PKI posture in one shot (downgrade, ROBOT, SWEET32, Terrapin, cert/CT)
python3 scripts/tls_audit.py target.com:443 --ssh target.com:22 --ct --json out.json
testssl.sh --full --robot --sweet32 https://target.com   # cross-check with the canonical tool

# 1. RSA weak-key triage on a captured public key
python3 scripts/rsa_attack.py --pubkey server.pem --ct ciphertext.b64 --auto
#   tries Fermat (p~=q), Wiener (small d), batch-GCD/common-modulus, ROCA fingerprint

# 2. ECDSA key recovery from a signature corpus (reuse or bias)
python3 scripts/ecdsa_lattice.py recover sigs.json --curve secp256r1 --known-msb 4
#   reuse: needs 2 sigs w/ same r; bias: ~256-1200 sigs depending on leak

# 3. Symmetric/AEAD misuse
python3 scripts/padding_oracle.py --url https://t/dec --ct $CT --block 16   # CBC oracle
python3 scripts/gcm_nonce_reuse.py forbidden ct1.bin ct2.bin --nonce $N     # recover H + forge

# 4. JWT forgery chain
python3 scripts/jwt_forge.py confusion --pubkey jwt_pub.pem --claims '{"role":"admin"}'
python3 scripts/jwt_forge.py none      --claims '{"sub":"admin"}'

# 5. Hash triage + crack plan
python3 scripts/hash_triage.py hashes.txt            # identify + emit hashcat -m / john format
hashcat -m 22000 capture.hc22000 wl.txt -r rules/best64.rule

OPSEC & Detection (summary)

Technique	Telemetry / IOC	Detection (Sigma/EDR)	OPSEC note
TLS scanning / testssl	Burst of handshakes, many cipher renegotiations, malformed ClientHellos	NIDS: high TLS alert rate from one src; Zeek ssl.log anomalous cipher offers	Rate-limit, spread across source IPs; passive cert/CT recon leaves no target-side trace
Marvin/ROBOT oracle probing	~10^4–10^6 RSA decrypts, repeated malformed pre-master/CMS	WAF/IDS: spike of TLS decrypt errors, identical-size payloads	Extremely loud; only against authorized hosts; use minimal query budgets
Terrapin MitM	Injected SSH_MSG_IGNORE, sequence-number gap at NEWKEYS	SSH server logs kex mismatch; netflow showing on-path device	Requires active MitM; detectable by strict-kex peers; abort if kex-strict present
ECDSA nonce harvesting	Bulk signature collection (Git, TLS, SSH, blockchain)	Mostly offline — no target telemetry once sigs captured	Collection is passive; recovery is offline; rotate-key advice in report
CBC padding oracle	Thousands of decrypt requests, alternating valid/invalid padding	Web logs: ~256×blocks requests to one endpoint; Sigma on 4xx burst	Very noisy (256×blocks×msgs); throttle, randomize timing
GCM nonce reuse / partitioning	Repeated (nonce,key) pairs; multi-key ciphertext blobs	App crypto audit; flag reused IVs in logs	Forbidden-attack math is offline once two ciphertexts captured
JWT forgery	Anomalous alg, external jku/x5u fetch, all-zero ES signature	Sigma: JWT with alg:none/HS after RS expected; egress to attacker JWKS URL	Each forged token is a single request; minimal noise
Hash cracking	None on target (offline)	N/A unless online spray (then T1110)	Offline; protect loot at rest; never spray live without scope

Deep Dives

• references/tls-pki-audit.md — TLS/SSL/SSH posture: cipher/protocol downgrade, Terrapin (CVE-2023-48795), Marvin/Bleichenbacher (CVE-2022-4304, CVE-2024-2236), SWEET32/DROWN/Logjam/POODLE, X.509 and Certificate-Transparency analysis.
• references/rsa-attacks.md — Weak-key factoring: Fermat, Wiener, common modulus, Hastad broadcast, Coppersmith partial-key, batch-GCD, ROCA (CVE-2017-15361); RsaCtfTool / cado-nfs / SageMath workflow.
• references/ecc-nonce-attacks.md — ECDSA/DSA nonce reuse, biased-nonce lattice/HNP recovery (Minerva, PuTTY CVE-2024-31497), invalid-curve attacks, psychic signatures (CVE-2022-21449).
• references/symmetric-aead.md — Block-cipher mode misuse: ECB detection, CBC padding oracle, CTR/GCM nonce reuse (forbidden attack), AEAD key-commitment / invisible salamanders / partitioning oracles.
• references/jwt-jose.md — JWT/JOSE token forgery: algorithm confusion (CVE-2024-54150), alg=none, jwk/jku/x5u/kid injection, weak-secret cracking, library-level CVE landscape.
• references/hash-pq.md — Hash identification, modern GPU cracking economics (RTX 40/50-series), KDF strength grading, and post-quantum migration / "harvest now, decrypt later" assessment (ML-KEM/ML-DSA, hybrid TLS, crypto-agility).