CTF challenges & writeups

151 challenges in family ⊕ crypto:rsa ✕ clear · browse all techniques

Challenge	CTF	Weight	Category	Has
A_Fine_Product #safe-prime-factorization	L3akCTF 2026	34.47	Crypto	files wu 1
The_Accursed_Lego_Bin #rsa #low-public-exponent #prng-seed-recovery	UMassCTF 2026	65.95	Crypto	files wu 1
Hextrap #ecm-factorization #rsa #oaep	V1T 2026	22.14	Crypto	files wu 1
nom_nom #rsa #franklin-reiter #related-message	VuwCTF 2026	25.00	Crypto	files wu 1
Noob_RSA_Returns #rsa #fermat-little-theorem	BITSCTF 2025	–	Crypto	files wu 1
Lowkey_RSA #wiener-attack	L3akCTF 2025	24.43	Crypto	files wu 2
symmetric #rsa #multi-prime	UIUCTF 2025	–	Crypto	files wu 1
too_many_primes #rsa #multi-prime	UIUCTF 2025	–	Crypto	files wu 1
Encryptor_Shop #rsa-shared-prime	BCACTF 2024	–	Crypto	files wu 1
RSAEncrypter #hastad-broadcast	BCACTF 2024	–	Crypto	files wu 1
Key_in_a_Haystack #factorization #small-primes	UIUCTF 2024	–	Crypto	files wu 1
Third_Times_the_Charm #rsa #hastad-broadcast #crt	UMassCTF 2024	43.10	Crypto	files wu 2
Pianoman #rsa #steganography	UofTCTF 2024	23.90	Crypto	files wu 2
PQ #rsa #fermat-factorization #close-primes	VolgaCTF 2024 Quals	35.91	Crypto	files wu 1
RSA #rsa-cube-root-attack	n00bzCTF 2024	24.23	Crypto	files wu 2
Really_Secure_Apparently #rsa #wiener-attack #small-private-exponent	1337UP 2023	24.23	Crypto	files wu 2
RSA1 #rsa #small-modulus-factorization	BYUCTF 2023	–	Crypto	files wu 1
RSA2 #rsa #factordb	BYUCTF 2023	–	Crypto	files wu 1
RSA3 #rsa #common-factor	BYUCTF 2023	–	Crypto	files wu 1
RSA4 #rsa #hastad-broadcast	BYUCTF 2023	–	Crypto	files wu 1
RSA5 #rsa #common-modulus-attack	BYUCTF 2023	–	Crypto	files wu 1
Curvy_Curves #elliptic-curve-over-ring #rsa-factoring	BackdoorCTF 2023	–	Crypto	files wu 1
Something_in_Common #rsa #hastad-broadcast-attack #non-coprime-moduli #crt	BackdoorCTF 2023	–	Misc	files wu 2
RSA_School_1st_Grade #rsa #known-prime	BlueHens 2023	24.61	Crypto	files wu 1
RSA_School_2nd_Grade #rsa #factordb	BlueHens 2023	24.61	Crypto	files wu 1
RSA_School_3rd_Grade #rsa #common-modulus-attack	BlueHens 2023	24.61	Crypto	files wu 1
RSA_School_4th_Grade #rsa #d-to-factorization	BlueHens 2023	24.61	Crypto	files wu 1
RSA_School_5th_Grade #rsa #low-exponent #cube-root	BlueHens 2023	24.61	Crypto	files wu 1
RSA_School_6th_Grade #rsa #hastad-broadcast #crt	BlueHens 2023	24.61	Crypto	files wu 1
RSA_School_7th_Grade #rsa #fermat-factorization	BlueHens 2023	24.61	Crypto	files wu 1
RSA_School_8th_Grade #rsa #fermat-factorization	BlueHens 2023	24.61	Crypto	files wu 1
Insights #rsa #predictable-private-exponent	Crypto 2023	59.60	Misc	files wu 1
Fractional_Flag #rsa-variant #wiener-lattice-attack #small-private-exponent	Cryptoverse 2023	24.52	Crypto	files wu 1
DesintegratedRSA #rsa #bit-flip-recovery #prime-reconstruction	DaVinciCTF 2023	29.26	Crypto	files wu 2
BBBB #rsa #lcg #coppersmith	DiceCTF 2023	36.70	Crypto	files wu 1
really-small-algorithm #rsa	HSCTF 2023	–	Crypto	files wu 1
chinese-lazy-theorem-2 #crt-reconstruction	LA 2023	–	Crypto	files wu 1
RSA_Outro #rsa-related-primes	NahamCon 2023	34.82	Crypto	files wu 3
Noisier_CRC #crc #crt #polynomial	SekaiCTF 2023	24.86	Crypto	files wu 1
Noisy_CRC #crc #polynomial #crt	SekaiCTF 2023	24.86	Crypto	files wu 1

Challenges