CTF challenges & writeups

1454 challenges in family ⊕ crypto ✕ clear · browse all techniques

Challenge	CTF	Weight	Category	Has
Digitally_Encrypted_1 #logic-circuit-reversing #xor-cipher	BCACTF 2021	–	Reverse	files wu 2
Digitally_Encrypted_2.99999 #logic-circuit-reversing #shift-xor-cipher-inversion	BCACTF 2021	–	Reverse	files wu 1
Digitally_Encrypted_3 #logic-circuit-reversing #shift-add-xor-cipher	BCACTF 2021	–	Reverse	files wu 1
Easy_RSA #rsa #textbook-decryption	BCACTF 2021	–	Crypto	files wu 3
FNES_1 #rc4 #keystream-reuse	BCACTF 2021	–	Crypto	files wu 1
Little_e #rsa #small-exponent-e-3 #cube-root	BCACTF 2021	–	Crypto	files wu 1
Sailing_Thru_Decryption #signal-flag-decoding #binary #vigenere	BCACTF 2021	–	Crypto	files wu 2
Slightly_Harder_RSA #rsa #factordb-factorization	BCACTF 2021	–	Crypto	files wu 2
Storytime_The_Tragic_Interlude #xor-decryption	BCACTF 2021	–	Reverse	files wu 2
Entropy #lcg #z3-solver	BlueHens 2021	22.62	Reverse	files wu 2
OTP1 #repeating-key-xor #xortool	BlueHens 2021	22.62	Crypto	files wu 1
OTP2 #xor #known-plaintext	BlueHens 2021	22.62	Crypto	files wu 1
OTP3 #two-time-pad #key-reuse	BlueHens 2021	22.62	Crypto	files wu 1
hot_diggity_dog #wiener-attack	BlueHens 2021	22.62	Crypto	files wu 1
A_Different_Type_of_Serial_Key #hardware #logic-analyzer #spi #i2c #xor-decode	CSAW 2021 Quals	20.54	Hardware	files wu 1
A_Pain_in_the_BACnet #pcap-analysis #bacnet #scapy #protocol-parsing	CSAW 2021 Quals	20.54	Hardware	files wu 3
Bits #rsa #lsb-oracle #discrete-log #binary-search-factoring	CSAW 2021 Quals	20.54	Crypto	files wu 3
Crack_Me #hash-cracking #salted-sha256 #hashcat	CSAW 2021 Quals	20.54	Crypto	files wu 3
Forgery #elgamal-signature #existential-forgery #unhashed-message #mask-bypass	CSAW 2021 Quals	20.54	Crypto	files src wu 3
haySTACK #srand-time-seed-bruteforce #prng-prediction	CSAW 2021 Quals	20.54	Pwn	files wu 2
ransomwaRE #malware-reversing #date-seeded-key #aes-ctr #keystream-reuse	CSAW 2021 Quals	20.54	Reverse	files wu 2
DoRSA #rsa #wiener-attack #continued-fractions	Crypto 2021	36.00	Misc	files wu 1
Onlude #lu-decomposition #matrix-algebra-gf-p	Crypto 2021	36.00	Misc	files wu 1
RSAphantine #rsa #diophantine-equations #sum-of-cubes-factoring	Crypto 2021	36.00	Misc	files wu 1
Rima #custom-encoding-reversal #base5	Crypto 2021	36.00	Misc	files wu 2
Rohald #twisted-edwards-curve #curve-parameter-recovery #edwards-to-weierstrass #ecdlp	Crypto 2021	36.00	Misc	files wu 1
TRUNC #ecdsa-signature-forgery #signature-malleability	Crypto 2021	36.00	Misc	files wu 1
Triplet #rsa #shared-exponent-multiple-moduli #phi-multiple	Crypto 2021	36.00	Misc	files wu 2
Wolf #aes-gcm #short-nonce-bruteforce	Crypto 2021	36.00	Misc	files wu 2
ecchimera #ecc-over-zmod-n #smart-attack #pohlig-hellman #crt	Crypto 2021	36.00	Misc	files wu 1
elegant_curve #anomalous-curve #smart-attack #smooth-order #pohlig-hellman	Crypto 2021	36.00	Misc	files wu 1
farm #gf-2-6 #small-keyspace-bruteforce	Crypto 2021	36.00	Misc	files wu 2
frozen #signature-forgery #masked-key-recovery #modular-inverse	Crypto 2021	36.00	Misc	files wu 1
hamul #rsa #factoring-concatenated-primes	Crypto 2021	36.00	Misc	files wu 1
hyper_normal #modular-linear-scheme #per-column-bruteforce	Crypto 2021	36.00	Misc	files wu 2
keybase #aes-cbc #partial-key-bruteforce #iv-recovery	Crypto 2021	36.00	Misc	files wu 2
linda #elgamal-variant #smooth-p-1 #pohlig-hellman #discrete-log	Crypto 2021	36.00	Misc	files wu 1
maid #rabin-cryptosystem #modulus-recovery-gcd #decryption-oracle	Crypto 2021	36.00	Misc	files wu 1
tiny_ecc #anomalous-curve #smart-attack #smooth-order #pohlig-hellman	Crypto 2021	36.00	Misc	files wu 2
BootlessRSA #rsa #low-exponent #cube-root	DaVinciCTF 2021	24.50	Crypto	files wu 3

Challenges