CTF Scripts

This repository contains script solutions for various CTF challenges.

Contents

CryptoPals

Challenge	Set	Script
01. Convert hex to base64	Set 1	challenge_01.py
02. Fixed XOR	Set 1	challenge_02.py
03. Single-byte XOR cipher	Set 1	challenge_03.py
04. Detect single-character XOR	Set 1	challenge_04.py
05. Implement repeating-key XOR	Set 1	challenge_05.py
06. Break repeating-key XOR	Set 1	challenge_06.py
07. AES in ECB mode	Set 1	challenge_07.py
08. Detect AES in ECB mode	Set 1	challenge_08.py
09. Implement PKCS#7 padding	Set 2	challenge_09.py
10. Implement CBC mode	Set 2	challenge_10.py
11. An ECB/CBC detection oracle	Set 2	challenge_11.py
12. Byte-at-a-time ECB decryption (Simple)	Set 2	challenge_12.py
13. ECB cut-and-paste	Set 2	challenge_13.py
14. Byte-at-a-time ECB decryption (Harder)	Set 2	challenge_14.py
15. PKCS#7 padding validation	Set 2	challenge_15.py
16. CBC bitflipping attacks	Set 2	challenge_16.py
17. The CBC Padding oracle	Set 3	challenge_17.py

Hack The Box

Challenge	Category	Script	Topics
Alpashcii Clashing	crypto	alphascii_clashing.py	MD5 hash collision.
Ancient Encodings	crypto	ancient_encodings.py	Base64, hex encodings.
Android in the Middle	crypto	android_in_the_middle.py	Diffie-Hellman. Choosen Public Key Attack.
Arranged	crypto	arranged.py	ECC. Small subgroup discrete log.
Baby quick maffs	crypto	baby_quick_maffs.py	Modular arithmetic. Equation manipulation.
Binary basis	crypto	binary_basis.py	RSA. Multiple primes encoding.
Brainy's Cipher	crypto	brainys_cipher.py	RSA. Chinese Remainder Theorem.
Brevi Moduli	crypto	brevi_moduli.py	RSA. Small modulus factorization.
Digital Safety Annex	crypto	digital_safety_annex.py	DSA. Nonce $k$ brute force.
Fast Carmichael	crypto	fast_carmichael.py	Carmichael numbers. Find the paper challenge.
Flippin Bank	crypto	flippin_bank.py	AES. Flipping bit attack.
Gonna lift em all	crypto	gonna_lift_em_all.py	ElGamal. Implementation flaw.
Hidden Handshake	crypto	hidden_handshake.py	AES CTR. Known Plaintext attack.
Initialization	crypto	initialization.py	AES.CTR. Known Plaintext attack.
Lost Key	crypto	lostkey.py	ECC. Curve parameters recovery. Pohlig-Hellman.
Lost Modulus	crypto	lost_modulus.py	RSA. Small exponent without message padding.
Lost Modulus Again	crypto	lost_modulus_again.py	RSA. Coppersmith's short pad attack.
Nuclear Sale	crypto	nuclear_sale.py	.pcap analysis
Optimus Prime	crypto	optimus_prime.py	RSA. Shared prime on different keys. GCD attack
Quadratic Points	crypto	quadratic_points.py	Integer polynomial coefficients recovery. ECC discrete log. CRT.
RLotto	crypto	rlotto.py	PRNG. Time seed
Rookie Mistake	crypto	rookie_mistake.py	RSA. Implementation fault.
Secure Signing	crypto	secure_signing.py	SHA256. Byte at a time Oracle Attack
Sekur Julius	crypto	sekur_julius.py	Caesar cipher brute force.
SPG	crypto	spg.py	AES. Weak random key recovery.
Spooky RSA	crypto	spooky_rsa.py	RSA. Encrypted prime. GCD attack.
Sugar Free Candies	crypto	sugar_free_candies.py	Integer equation system.
Symbols	crypto	symbols.py	Legendre symbol.
Two for One	crypto	two_for_one.py	RSA. Polynomial gcd. Franklin-reiter attack.
Weak RSA	crypto	weak_rsa.py	RSA. Small $d$. Wiener Attack.

TAMUctf 2026

Challenge	Category	Script	Topics
Abnormal Ellipse	crypto	abnormal_ellipse.py	ECC. Smart Attack.
Hidden Log Factoring	crypto	hidden_log_factoring.py	RSA. Pohlig-Hellman. Factor $N$ from $d$.