All Challenges (Compact)

Name	Number of Solvers	Available Points
Number Sequence	4169	100
Original Caesar Cipher	2888	100
Number Sequence — Part 2	2037	100
Caesar Encryption	1379	100
Beaver Code	1142	100
Letter to the Templars — Part 1	996	100
Number Sequence — Part 3	953	100
Letter to the Templars — Part 2	798	100
A hidden word	786	100
Number Sequence — Part 4	785	100
Letter to the Templars — Part 3	688	1085
Affine Codes / Modulo Arithmetic with N / Extended Euclid	559	100
Monoalphabetic Substitution	532	100
Cracking SHA1-Hashed Passwords	518	1081
Factorization Cipher — Part 1	479	100
Grille Cipher	462	100
Advent-Challenge — Part 1	399	100
A modified homophonic cipher with reduced alphabets — Part 1	377	100
Number Sequence — Part 8	352	100
A modified homophonic cipher with reduced alphabets — Part 2	324	100
One-Time Pad with Flaws	300	100
Alice's Birthday Party (Part 1)	284	1080
Snow White and the seven dwarfs	280	100
Alice's Birthday Party (Part 2)	278	1080
From Russia with Love	267	100
Broadcasting and low exponent — RSA Attack	222	1082
Modified Caesar Cipher	218	100
How do you become a big cryptographer?	218	100
M-138 — Part 1	200	100
Brute-Force-Attack on Triple-DES with Reduced Key Space	190	1080
Not-so-Secret Message from Malawi — Part I (RSA)	187	1080
Reserve Hand Procedure — Part 1	187	100
Letter from the Alleged Countess Julie von Ortenburg	172	100
Classical Ciphers^3	170	100
Hybrid Encryption I	166	1081
Enigma Messages with Repeated Letters — Part 1	166	100
Nils away on travel	161	100
Cryptanalysis Hacking Puzzles — Part 2	152	100
RSA: Two different keys — same ciphertext	151	1082
Pigpen with a twist — Part 1	148	100
Molehunt (Part 1/3)	146	100
¿No Hablas Español? No problemo!	146	100
Number Sequence — Part 6	145	100
Factorization Cipher — Part 2	144	1083
The Book Code: A Challenge for Bookworms	141	100
Molehunt (Part 2/3)	138	100
Autokey Cipher	137	100
Enigma Part 1	129	1080
M-138 — Part 2	124	1091
A Secret Message from Castle Mansfeld	123	100
Image Noise	121	100
Trifid Cipher	117	100
ADFGVX — Part 2	114	100
A really long number sequence	113	1082
Playfair Encryption	108	100
ADFGVX — Part 1	108	100
Double Columnar Transposition	106	100
Number Sequence — Part 9	106	100
Playfair with hints about the grid	105	100
Kaskade-S/T — Part 1	101	100
Number Sequence — Part 10	100	100
A hidden word — Part 2	99	100
Enigma Combinatorics	97	100
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1	94	100
Zodiac Cipher	93	100
Factorization Cipher — Part 3	90	1083
Heartbleed — Part 1	90	100
Number Sequence — Part 5	89	100
Hill Cipher with Sudoku Key	89	100
ECDH-Key Exchange for Beginners	88	100
The Last Note	87	100
Enigma Part 2	86	1080
Number Sequence — Part 7	85	100
Partial Key Exposure with RSA — Part 1	81	1083
Molehunt (Part 3/3)	79	1080
ORYX Stream Cipher Part I	78	1080
Enigma Messages with Repeated Letters — Part 2	77	100
Enigma Messages with Repeated Letters — Part 3	77	100
AES key — encoded in the machine readable zone of a European ePassport	74	1083
Enigma Messages	74	100
Multilingual Monoalphabetic Substitution	74	100
Enigma Messages with Repeated Letters — Part 5	74	100
Smartcard RSA	70	1080
BCR code (Book-Caesar-RSA)	69	1085
Enigma Messages with Repeated Letters — Part 4	69	100
Turing Bombe Enigma I	68	100
Cascading Encryption — Part 1/3	67	100
Unusual encryption using a diophantine equation	63	1082
Recycled One-Time Pad	63	100
Monoalphabetic substitution with camouflage — Part 1	60	100
Heartbleed — Part 2	60	100
Modular Sequences	58	100
An Invisible Message	56	100
M-138 — Part 3	56	1091
The Einstein Enigma	56	1108
Find the right route — Part 1	56	100
RSA Factoring Challenge: RSA-704	55	0
News from Castle Mansfeld	52	100
Kaskade-S/T — Part 2	50	1081
Unconcealed RSA messages	49	1083
Monoalphabetic substitution with camouflage — Part 2	49	1083
Summer Job	49	1111
ORYX Stream Cipher Part II	47	1080
Lunchtime Attack on the Fully Homomorphic Encryption Scheme	47	1081
RSA Factoring Challenge: RSA-210	47	0
New Year's Greetings — Part 1	47	100
Monoalphabetic substitution with camouflage — Part 4	46	100
Strange Message from Thessaloniki	46	100
Monoalphabetic substitution with camouflage — Part 3	45	1083
Keyshanc — Part 1	45	1084
Advent-Challenge — Part 2	45	1107
Wheatstone Cryptograph — Part 1	45	100
Double Column Transposition — Part 4	44	1089
Weakened Granit — Part 1	43	100
New Year's Greetings — Part 2	43	100
CMEA 1	41	1081
Music Code — Part 1	41	100
Double Column Transposition — Part 2	41	1089
New Year's Greetings — Part 3	41	100
Music Code — Part 2	40	1082
An 'unhearable' message	40	100
Lightweight Introduction to Lattices — Part 1	40	100
Advent Challenge — Part 3	39	1107
Not-so-Secret Message from Malawi — Part II (ECC)	38	1080
Ku Klux Klan	38	Variable
Pigpen with a twist — Part 2	38	1082
New Year's Greetings — Part 4	38	100
Pigpen with a twist — Part 3	37	1082
Double Column Transposition — Part 3	37	1089
Advent Challenge — Part 4	37	1107
Homophonic Encryption — Part 1	37	1120
Keyshanc — Part 2	36	1084
Kaskade-S/T — Part 3	33	1081
Heartbleed — Part 3	33	1090
Polyhomophonic Substitution — Part 1	33	100
Fastest in the West	32	1111
Homophonic Encryption — Part 2	32	1120
RSA Factoring Challenge: RSA-220	31	0
Trendy Messenger	31	1111
Homophonic Encryption — Part 3	31	1120
Lattice Part 1	30	1081
ORYX Stream Cipher — Part 3 (revised)	30	1087
Homophonic Encryption — Part 4	30	1120
Spanish Strip Cipher — Part 1	29	1089
Double Column Transposition — Part 1	29	1089
Monoalphabetic Substitution with Nostradamus Flavor	29	1117
RSA Factoring Challenge: RSA-230	28	0
Monoalphabetic Substitution with Camouflage — Part 5	28	1083
Lightweight Introduction to Lattices — Part 2	28	100
CMEA 2	27	13050
Spanish Strip Cipher — Part 2	26	1089
Cryptanalysis Hacking Puzzles — Part 1	26	100
Lightweight Introduction to Lattices — Part 3	26	1143
Typex — Part 1	25	1086
M-138 — Part 4	25	1091
RSA with Special d	23	13044
Handycipher made in love — Part 1	23	1117
Typex — Part 2	22	1086
AES ECB Wrong Encoding	22	1107
Find the right route — Part 2	22	100
Polyphonic Substitution Cipher — Part 1	20	1128
The LoRa Cipher: Logic Randomness — Part 1	20	1133
Find the right route — Part 3	20	100
Breaking a Filter Generator	19	1113
Polyhomophonic Substitution — Part 2	19	1135
Purple 1	18	1080
RSA Factoring Challenge: RSA-240	17	0
Handycipher made in love — Part 2	17	1121
Polyphonic Substitution Cipher — Part 2	17	1131
Sigaba Part 1	16	1080
RSA Factoring Challenge: RSA-250	16	0
Concealed Messages — Vigenère's Night Sky	16	0
ASAC — A Strong(er) ADFGVX Cipher — Part 1	16	1098
The T52 Sturgeon Challenge — Part 1	16	1123
RSA Factoring Challenge: RSA-232	15	0
Weakened Handycipher — Part 1	15	1093
Flawed Usage of a OTP Cipher by the BND	15	1094
New Year's Greetings — Part 5	15	1096
The T52 Sturgeon Challenge — Part 2	15	1123
A Cloaked Substitution Cipher — Part 1	15	1124
Cipher ID — Part 1	15	1128
Cascading Encryption — Part 2/3	14	1086
Weakened Handycipher — Part 3	14	1093
A Cloaked Substitution Cipher — Part 2	14	1124
Polyhomophonic Substitution — Part 3	14	1136
Weakened Handycipher — Part 2	13	1093
The T52 Sturgeon Challenge — Part 3	13	1123
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2	12	1081
Cascading Encryption — Part 3/3	12	1086
ORYX Stream Cipher — Part 4a	11	1089
The SZ42 Challenge — Part 1	11	1144
The SZ42 Challenge — Part 2	11	1145
Akelarre Part 1	10	1081
Kaskade-S/T — Part 5	10	1082
The T52 Sturgeon Challenge — Part 4	10	1123
Hilly — Part 1	9	1101
The SIGABA Challenge — Part 1	9	1134
The SZ42 Challenge — Part 4	9	1147
Double Column Transposition — Part 5	8	1090
The T52 Sturgeon Challenge — Part 8	8	1124
The SIGABA Challenge — Part 2	8	1134
The SZ42 Challenge — Part 3	8	1146
The SZ42 Challenge — Part 5	8	1147
Handycipher — Part 2	7	1092
The T52 Sturgeon Challenge — Part 11	7	1124
The T52 Sturgeon Challenge — Part 12	7	1124
The SZ42 Challenge — Part 6	7	1150
The SZ42 Challenge — Part 8	7	1153
Handycipher — Part 3	6	13251
Holographic Encryption — Part 1	6	1102
Kaskade-S/T — Part 6 (RansomKaskade Part 1)	6	1103
The T52 Sturgeon Challenge — Part 9	6	1124
The T52 Sturgeon Challenge — Part 5	6	1124
The T52 Sturgeon Challenge — Part 6	6	1124
The T52 Sturgeon Challenge — Part 7	6	1124
The SIGABA Challenge — Part 3	6	13908
The SZ42 Challenge — Part 7	6	1153
The SZ42 Challenge — Part 9	6	1159
Wheatstone Cryptograph — Part 2	6	1188
Sigaba Part 2	5	13044
Handycipher — Part 1	5	1092
Spirale — Part 1	5	1094
Spirale — Part 2	5	1094
Handycipher — Part 5	5	13346
Handycipher — Part 6	5	13346
Weakened Handycipher — Part 4	5	1098
Weakened Handycipher — Part 5	5	1098
Weakened Handycipher — Part 6	5	1098
"The Road" — Part 1	5	1115
The T52 Sturgeon Challenge — Part 10	5	1124
The SIGABA Challenge — Part 4	5	13913
Notes of an Italian Soldier	4	0
Spirale — Part 3	4	1094
Handycipher — Part 4	4	13346
ElsieFour — Part 1	4	13467
Weakened ElsieFour — Part 3	4	1105
Weakened ElsieFour — Part 1	4	1109
The Heavy T52 Sturgeon Challenge — Part 4	4	13938
The Heavy T52 Sturgeon Challenge — Part 7	4	13946
The SZ42 Challenge — Part 12	4	1268
The SZ42 Challenge — Part 13	4	1268
Extended Handycipher — Part 1	3	1092
Extended Handycipher — Part 2	3	1092
Extended Handycipher — Part 3	3	1092
Extended Handycipher — Part 4	3	13346
Extended Handycipher — Part 5	3	13346
Handycipher — Part 8	3	13396
Handycipher — Part 9	3	13396
Holographic Encryption — Part 2	3	1102
The Vatican Challenge — Part 1	3	0
The Vatican Challenge — Part 2	3	0
Christmas Challenge 2019: Differential Cryptanalysis — Part 1	3	1130
Differential Cryptanalysis — Part 2	3	1132
The Heavy T52 Sturgeon Challenge — Part 5	3	13944
The SZ42 Challenge — Part 10	3	1165
The SZ42 Challenge — Part 11	3	1165
Double Column Transposition	2	0
Unknown Author	2	Variable
ORYX Stream Cipher — Part 4b	2	13199
Extended Handycipher — Part 6	2	13346
Handycipher — Part 7	2	13396
Catherine of Aragon's Letter to King Ferdinand, her Father (1509)	2	Variable
The Heavy T52 Sturgeon Challenge — Part 3	2	13804
The SIGABA Challenge — Part 5	2	13921
The Heavy T52 Sturgeon Challenge — Part 6	2	13945
The Heavy T52 Sturgeon Challenge — Part 9	2	13952
SIGABA CSP-889 — Part 1	2	1191
SIGABA CSP-889 — Part 2	2	1191
SIGABA CSP-889 — Part 3	2	14643
SIGABA CSP-2900 — Part 1	2	1214
SIGABA CSP-2900 — Part 2	2	1214
SIGABA CSP-2900 — Part 3	2	14911
Beale Ciphers	1	Variable
Substitution Cipher with Non-Prefix Codes	1	13069
Monoalphabetic Substitution with Camouflage — Part 6	1	1084
ASAC — A Strong(er) ADFGVX Cipher — Part 2	1	1098
Hilly — Part 2	1	1105
Handycipher — Part 10	1	1122
The Vatican Challenge — Part 4	1	Variable
The Heavy T52 Sturgeon Challenge — Part 1	1	13786
The SIGABA Challenge — Part 6	1	13929
D'Agapeyeff	0	Variable
Dorabella	0	Variable
Kryptos	0	Variable
World Record Challenge: Break 65 Bits of AES	0	13044
Recovering the Private Key in the Fully Homomorphic Encryption Scheme	0	13053
Twelve-Year-Old Murder Case	0	Variable
Kaskade-S/T — Part 4	0	1082
Digital Signatures: DSA with Medium Fields	0	13077
The third ENIGMA M4 message	0	Variable
RSA Factoring Challenge: RSA-260	0	13095
RSA Factoring Challenge: RSA-270	0	13095
RSA Factoring Challenge: RSA-896	0	13095
RSA Factoring Challenge: RSA-280	0	13095
RSA Factoring Challenge: RSA-290	0	13095
RSA Factoring Challenge: RSA-300	0	13095
RSA Factoring Challenge: RSA-309	0	13095
RSA Factoring Challenge: RSA-1024	0	13095
RSA Factoring Challenge: RSA-310	0	13095
RSA Factoring Challenge: RSA-320	0	13095
RSA Factoring Challenge: RSA-330	0	13095
RSA Factoring Challenge: RSA-340	0	13095
RSA Factoring Challenge: RSA-350	0	13095
RSA Factoring Challenge: RSA-360	0	13095
RSA Factoring Challenge: RSA-370	0	13095
RSA Factoring Challenge: RSA-380	0	13095
RSA Factoring Challenge: RSA-390	0	13095
RSA Factoring Challenge: RSA-400	0	13095
RSA Factoring Challenge: RSA-410	0	13095
RSA Factoring Challenge: RSA-420	0	13095
RSA Factoring Challenge: RSA-430	0	13095
RSA Factoring Challenge: RSA-440	0	13095
RSA Factoring Challenge: RSA-450	0	13095
RSA Factoring Challenge: RSA-460	0	13095
RSA Factoring Challenge: RSA-1536	0	13095
RSA Factoring Challenge: RSA-470	0	13095
RSA Factoring Challenge: RSA-480	0	13095
RSA Factoring Challenge: RSA-490	0	13095
RSA Factoring Challenge: RSA-500	0	13095
RSA Factoring Challenge: RSA-617	0	13095
RSA Factoring Challenge: RSA-2048	0	13095
ORYX Stream Cipher — Part 4d	0	13157
Double Column Transposition Reloaded — Part 1	0	13180
Double Column Transposition Reloaded — Part 2	0	13180
Double Column Transposition Reloaded — Part 3	0	13180
Spanish Strip Cipher — Part 3	0	Variable
ORYX Stream Cipher — Part 4c	0	13199
Double-Column Transposition/Granit — Part 1	0	1093
Double-Column Transposition/Granit — Part 2	0	1093
Double-Column Transposition/Granit — Part 3	0	1093
Spirale — Part 4	0	13282
Weakened Granit — Part 2	0	1094
Weakened Granit — Part 3	0	1094
ASAC — A Strong(er) ADFGVX Cipher — Part 3	0	1098
ASAC — A Strong(er) ADFGVX Cipher — Part 4	0	1098
ASAC — A Strong(er) ADFGVX Cipher — Part 5	0	1098
Weakened ElsieFour — Part 2	0	1109
"The Road" — Part 2	0	1115
"The Road" — Part 3	0	1115
The Vatican Challenge — Part 3	0	Variable
The Vatican Challenge — Part 5	0	Variable
The Heavy T52 Sturgeon Challenge — Part 2	0	13792
The Heavy T52 Sturgeon Challenge — Part 8	0	13947