crypto

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title	Crypto
parent	Challenges
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permalink	/challenges/crypto/

Crypto Challenges

#	Challenge	Difficulty	Key Techniques	Writeup
1	Ancient Encodings	Very Easy	Base Encoding, Hex Encoding	7Rocky
2	Weak RSA	Very Easy	RSA Small Key, Factorization	7Rocky
3	Android-in-the-middle	Very Easy	Diffie-Hellman MITM	7Rocky
4	sekur julius	Easy	Caesar Cipher Variant	7Rocky
5	Classic, yet complicated!	Easy	Classical Cipher, Substitution	7Rocky
6	Jenny From The Block	Easy	Hash Length Extension, Block Cipher	7Rocky
7	Down the Rabinhole	Easy	Rabin Cryptosystem	7Rocky
8	How The Columns Have Turned	Easy	Columnar Transposition	7Rocky
9	Dynastic	Easy	Custom Cipher, Python Scripting	Medium - Rahul
10	The Three-Eyed Oracle	Easy	AES ECB Oracle Attack	7Rocky
11	Space Pirates	Easy	Shamir's Secret Sharing	7Rocky
12	One Step Closer	Easy	RSA Related Message Attack	7Rocky
13	Infinite Descent	Easy	RSA, Continued Fractions	GitHub
14	Brainy's Cipher	Easy	Custom Cipher Analysis	7Rocky
15	Gonna-Lift-Em-All	Easy	Diffie-Hellman Key Recovery	7Rocky
16	SPG	Easy	Secure Password Generator Weakness	7Rocky
17	Symbols	Easy	Symbol Substitution Cipher	7Rocky
18	I'm gRoot	Easy	Merkle Tree, Hash Collision	7Rocky
19	Iced Tea	Easy	TEA Cipher, Block Cipher	7Rocky
20	Perfect Synchronization	Easy	AES ECB, Frequency Analysis	7Rocky
21	Flippin Bank	Medium	AES CBC Bit Flipping	7Rocky
22	Initialization	Medium	AES Initialization Vector Leak	7Rocky
23	MSS	Medium	Secret Sharing Scheme Attack	7Rocky
24	Mayday Mayday	Medium	RSA CRT Fault Attack	7Rocky
25	Roulette	Medium	PRNG Prediction	7Rocky
26	TurboCipher	Medium	Custom Block Cipher Weakness	7Rocky
27	CryptoConundrum	Medium	Multi-Stage Decryption	7Rocky
28	BFD56	Medium	Blowfish Analysis	7Rocky
29	RLotto	Medium	PRNG Seed Recovery	7Rocky
30	Zombie Rolled	Medium	XOR + Custom Cipher	7Rocky
31	Interception	Medium	MITM Key Exchange	7Rocky
32	Vitrium Stash	Medium	Custom Encryption Scheme	7Rocky
33	Rookie Mistake	Medium	RSA Common Factor Attack	7Rocky
34	Partial Tenacity	Medium	RSA Partial Key Recovery	7Rocky
35	Arranged	Medium	RSA Lattice Attack	7Rocky
36	Tsayaki	Medium	AES CTR Nonce Reuse	7Rocky
37	Waiting List	Medium	Digital Signature Forgery	7Rocky
38	Composition	Medium	Mathematical Composition	7Rocky
39	Fibopadcci	Medium	Fibonacci Padding Oracle	7Rocky
40	I know Mag1k	Medium	Magic Number Exploitation	7Rocky
41	Homomurphy's Law	Medium	Homomorphic Encryption Weakness	7Rocky
42	signup	Medium	Signature Forgery	7Rocky
43	Oracle Leaks	Medium	Padding Oracle Attack	7Rocky
44	Lost Modulus	Medium	RSA Modulus Recovery	7Rocky
45	Living with Elegance	Medium	Elliptic Curve Cryptography	7Rocky
46	Blessed	Medium	RSA Oracle Attack	7Rocky
47	Quadratic Points	Medium	ECC Quadratic Residue	7Rocky
48	Not that random	Medium	LCG/PRNG State Recovery	7Rocky
49	Bloom Bloom	Medium	Bloom Filter Exploitation	7Rocky
50	Protein Cookies 2	Medium	Cookie Crypto Attack	7Rocky
51	Secure Signing	Medium	DSA/ECDSA Nonce Reuse	7Rocky
52	Clutch	Medium	Lattice-Based Crypto Attack	7Rocky
53	baby quick maffs	Medium	Simplified Math Attack	7Rocky
54	binary basis	Medium	Binary Number Theory	7Rocky
55	brevi moduli	Medium	Short RSA Modulus	7Rocky
56	alphascii clashing	Medium	ASCII Hash Collision	7Rocky
57	sugar free candies	Medium	Weak Custom Cipher	7Rocky
58	Hash the Filesystem	Medium	Filesystem Hash Analysis	7Rocky
59	Find Marher's Secret	Medium	Mathematical Secret Recovery	7Rocky
60	Lost Modulus Again	Hard	RSA Advanced Recovery	7Rocky
61	Digital Safety Annex	Hard	Digital Signature Exploitation	7Rocky
62	Traces	Hard	Side-Channel Analysis	7Rocky
63	Twin Oracles	Hard	Dual Oracle Attack	7Rocky
64	Verilicious	Hard	Verification Bypass	7Rocky
65	Copperbox	Hard	Coppersmith's Attack (RSA)	7Rocky
66	Mind In The Clouds	Hard	Cloud Crypto Exploitation	7Rocky
67	secure source	Hard	Source Code Crypto Analysis	7Rocky
68	read before you sign	Hard	Signature Scheme Attack	7Rocky
69	hybrid unifier	Hard	Hybrid Encryption Attack	7Rocky
70	Signing Factory	Hard	Signature Factory Exploitation	7Rocky
71	Converging Visions	Hard	ECC Point Convergence	7Rocky
72	Biased Heritage	Hard	Biased Nonce Attack (HNP)	7Rocky
73	Elliptic Labyrinth	Hard	ECC Invalid Curve Attack	7Rocky
74	Colliding Heritage	Hard	Hash Collision Attack	7Rocky
75	Inside The Matrix	Hard	Matrix-Based Crypto	7Rocky
76	Multipage Recyclings	Hard	AES Key Schedule Attack	7Rocky
77	TwoForOne	Hard	Signature Forgery	7Rocky
78	LunaCrypt	Hard	Custom Crypto Analysis	7Rocky
79	400curves	Hard	ECC Multi-Curve Analysis	7Rocky
80	RsaCtfTool	Hard	RSA Multi-Attack Automation	7Rocky
81	Nuclear Sale	Hard	Nuclear-Themed Crypto	7Rocky
82	Optimus Prime	Hard	Large Prime Exploitation	7Rocky
83	AbraCryptabra	Hard	Multi-Layer Decryption	7Rocky
84	quick maffs	Hard	Fast Math Crypto Attack	7Rocky
85	Ebola Virus	Hard	Virus-Themed Crypto	7Rocky
86	ElElGamal	Hard	ElGamal Signature Attack	7Rocky
87	Infinite Knapsack	Hard	Knapsack Problem Attack	7Rocky
88	AESWCM	Hard	AES Weak Counter Mode	7Rocky
89	Bank-er-smith	Hard	Banking Crypto Flaw	7Rocky
90	AHS512	Hard	Custom Hash Function	7Rocky
91	Spooky RSA	Hard	Multi-Prime RSA	7Rocky
92	Fast Carmichael	Hard	Carmichael Number Exploitation	7Rocky
93	BBGun06	Hard	BB84 Quantum Crypto	7Rocky

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