CTF challenges & writeups

94 challenges in family ⊕ crypto:block-cipher ✕ clear · browse all techniques

Challenge	CTF	Weight	Category	Has
Mystery #aes-ctr	Bhackari 2026	–	Reverse	files wu 1
Recovered_Signal_File #caesar-cipher	JerseyCTF 2026	37.00	Forensics	files wu 1
I_HATE_THIS_APP_REVENGE #aes-ctr-fixed-key	LYKNCTF 2026	–	Reverse	files wu 1
Tsukis_Rhythm_Game #pyinstaller #aes-cbc #marshal-bytecode #malware-c2	R3CTF 2026	35.95	Misc	files wu 1
obfpyscated #python-obfuscation #xor #aes	RITSEC 2026	–	Reverse	files wu 1
quantum_cipher #block-cipher-cryptanalysis	TRX 2026	–	Crypto	files wu 1
restricted_oracle #padding-oracle	GPN 2025	–	Crypto	files wu 2
Knights_Droid #caesar-cipher	KnightCTF 2025	18.78	Reverse	files wu 1
I_Like_McDonalds #hash-length-extension-attack #mac-forgery	BackdoorCTF 2024	–	Crypto	files wu 1
winter #winternitz #hash-based-signature #key-reuse #forgery	DiceCTF 2024 Quals	54.40	Crypto	files wu 3
rusty_vault #aes	DownUnderCTF 2024	68.04	Reverse	files wu 1
Attn_Agents #caesar-cipher	JerseyCTF 2024	21.26	Crypto	files wu 1
X64_Extension #reversing #aes-ni	SekaiCTF 2024	36.96	Reverse	files wu 1
PADGROUNDS #padding-oracle #aes-cbc	TFC 2024	–	Crypto	files wu 1
Tridea #meet-in-the-middle (mitm)#block-cipher #anti-debugging	VolgaCTF 2024 Quals	35.91	Reverse	files wu 1
Blocked1 #aes-cbc #bit-flipping	WolvCTF 2024	35.25	Crypto	files wu 1
Blocked2 #aes-ecb #known-plaintext	WolvCTF 2024	35.25	Crypto	files wu 1
TagSeries1 #ecb #mac-forgery	WolvCTF 2024	35.25	Crypto	files wu 2
Super_Secure_Encryption #pyc-decompilation #pbkdf2-aes #hardcoded-key	CYBERGON 2023	–	Reverse	files wu 1
Coin_Code #caesar-cipher	DEADFACE 2023	–	Crypto	files wu 1
DesintegratedRSA #rsa #bit-flip-recovery #prime-reconstruction	DaVinciCTF 2023	29.26	Crypto	files wu 2
4aes #aes #meet-in-the-middle (mitm)#bruteforce	Defcamp 2023 Quals	–	Crypto	files wu 1
Careless_Padding #padding-oracle	HITCON 2023 Quals	99.75	Crypto	files wu 1
double-trouble #caesar-cipher	HSCTF 2023	–	Crypto	files wu 3
zero-trust #aes-gcm-nonce-reuse	LA 2023	–	Web	files wu 1
DANCE #aes-gcm #tag-forgery	TSG 2023	–	Web	files wu 3
Three-Time_Pad #many-time-pad #key-reuse	UIUCTF 2023	–	Crypto	files src wu 2
cbc #classical-cipher #cbc-mode	corCTF 2023	36.97	Crypto	files wu 1
CwyptographicOwacle #ecdsa #signature-oracle #private-key-recovery #aes	DaVinciCTF 2022	24.50	Crypto	files wu 1
knock-knock #web #hmac-forgery #predictable-secret #nodejs	DiceCTF 2022	24.82	Web	files wu 3
ComicallyBadCrypto #padding-oracle #aes-cbc #bit-flipping	PatriotCTF 2022	24.52	Crypto	files wu 1
Cryptogod #cbc-mac-forgery	PatriotCTF 2022	24.52	Crypto	files src wu 1
ExtremelyCoolBook #aes-ecb #ecb-oracle #padding	PatriotCTF 2022	24.52	Crypto	files src wu 1
witches_symmetric_exam #padding-oracle #ofb #gcm	SECCON 2022 Quals	97.90	Crypto	files wu 1
RobustCBC #cbc-mac #mac-forgery #truncation-collision	SekaiCTF 2022	24.86	Crypto	files wu 1
DIY_Crypto #aes #custom-sbox	Tenable 2022	22.37	Crypto	files wu 1
mom_can_we_have_AES #aes #block-cipher	UIUCTF 2022	–	Crypto	files wu 1
msfrob #import-obfuscation #aes-decryption	corCTF 2022	24.92	Reverse	files src wu 1
service #windows-reversing #cryptoapi #aes	zer0pts 2022	35.97	Reverse	files wu 1
OTP3 #two-time-pad #key-reuse	BlueHens 2021	22.62	Crypto	files wu 1

Challenges