CTF challenges & writeups

873 challenges in family ⊕ crypto ✕ clear · browse all techniques

Challenge	CTF	Weight	Category	Has
Vinegar #vigenere-cipher	n00bzCTF 2024	24.23	Crypto	files wu 3
Vinegar_2 #vigenere-cipher	n00bzCTF 2024	24.23	Crypto	files wu 2
not_quite_caesar #seeded-prng #operation-inversion	vsCTF 2024	34.00	Crypto	files wu 2
1_10 #knapsack #merkle-hellman #lll (lll-lattice-reduction)	1337UP 2023	24.23	Crypto	files wu 1
Encoding #multi-layer-encoding #base32 #base64 #morse	1337UP 2023	24.23	Misc	files wu 1
FlagChecker #z3-constraint-solving #rust-reversing	1337UP 2023	24.23	Reverse	files wu 2
Keyless #reversible-arithmetic-cipher #no-key-encoding	1337UP 2023	24.23	Crypto	files wu 2
Not_So_Smooth #linear-congruence-recovery #modular-arithmetic #xor	1337UP 2023	24.23	Crypto	files wu 1
Really_Secure_Apparently #rsa #wiener-attack #small-private-exponent	1337UP 2023	24.23	Crypto	files wu 2
go-gopher #ssrf #gopher-protocol	AmateursCTF 2023	24.54	Web	files wu 3
Compact #dotsies-cipher	BYUCTF 2023	–	Crypto	files wu 1
Poem #keyboard-shift-cipher	BYUCTF 2023	–	Crypto	files wu 1
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
RevEng #xor-decryption #ghidra	BYUCTF 2023	–	Reverse	files wu 1
Curvy_Curves #elliptic-curve-over-ring #rsa-factoring	BackdoorCTF 2023	–	Crypto	files wu 1
Knapsack #knapsack #meet-in-the-middle (mitm)	BackdoorCTF 2023	–	Crypto	files wu 2
PRSA #polynomial-ring-rsa #gf(2)-polynomial-factorization	BackdoorCTF 2023	–	Crypto	files wu 1
Something_in_Common #rsa #hastad-broadcast-attack #non-coprime-moduli #crt	BackdoorCTF 2023	–	Misc	files wu 2
Classic_Checkers #constraint-solving #lisp	BlueHens 2023	24.61	Reverse	files wu 3
Greatest_Hits_1_of_4 #nested-encoding	BlueHens 2023	24.61	Crypto	files wu 1
Hide_n_Seek #steganography #morse-code #steghide	BlueHens 2023	24.61	Crypto	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
Super_Secure_Encryption #pyc-decompilation #pbkdf2-aes #hardcoded-key	CYBERGON 2023	–	Reverse	files wu 1
Barak #hessian-curve #ecdlp #pohlig-hellman	Crypto 2023	59.60	Misc	files wu 1
Blue_Office #lcg-keystream #seed-bruteforce #known-plaintext	Crypto 2023	59.60	Misc	files wu 1
Did_it #oracle-set-membership-leak #quadratic-residue-mapping	Crypto 2023	59.60	Misc	files wu 1
Insights #rsa #predictable-private-exponent	Crypto 2023	59.60	Misc	files wu 1
Roldy #order-preserving-encryption #binary-search-oracle	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

Challenges