All Challenges (Compact)

Name	Number of Solvers	Available Points
Number Sequence	4240	100
Original Caesar Cipher	2965	100
Number Sequence — Part 2	2081	100
Caesar Encryption	1415	100
Beaver Code	1164	100
Letter to the Templars — Part 1	1011	100
Number Sequence — Part 3	989	100
Number Sequence — Part 4	815	100
A hidden word	814	100
Letter to the Templars — Part 2	811	100
Letter to the Templars — Part 3	700	1083
Affine Codes / Modulo Arithmetic with N / Extended Euclid	576	100
Monoalphabetic Substitution	539	100
Cracking SHA1-Hashed Passwords	534	1080
Factorization Cipher — Part 1	491	100
Grille Cipher	473	100
Advent-Challenge — Part 1	435	100
A modified homophonic cipher with reduced alphabets — Part 1	384	100
Number Sequence — Part 8	383	100
A modified homophonic cipher with reduced alphabets — Part 2	331	100
One-Time Pad with Flaws	305	100
Alice's Birthday Party (Part 1)	295	1079
Snow White and the seven dwarfs	287	100
Alice's Birthday Party (Part 2)	284	1079
From Russia with Love	277	100
Broadcasting and low exponent — RSA Attack	228	1081
Modified Caesar Cipher	223	100
How do you become a big cryptographer?	222	100
M-138 — Part 1	209	100
Not-so-Secret Message from Malawi — Part I (RSA)	196	1079
Brute-Force-Attack on Triple-DES with Reduced Key Space	195	1079
Reserve Hand Procedure — Part 1	188	100
Classical Ciphers^3	177	100
Letter from the Alleged Countess Julie von Ortenburg	174	100
Hybrid Encryption I	174	1079
Enigma Messages with Repeated Letters — Part 1	171	100
Cryptanalysis Hacking Puzzles — Part 2	170	100
Nils away on travel	168	100
¿No Hablas Español? No problemo!	154	100
RSA: Two different keys — same ciphertext	153	1081
Number Sequence — Part 6	153	100
Pigpen with a twist — Part 1	151	100
Molehunt (Part 1/3)	149	100
Autokey Cipher	148	100
The Book Code: A Challenge for Bookworms	147	100
Factorization Cipher — Part 2	146	1081
Molehunt (Part 2/3)	141	100
Image Noise	134	100
M-138 — Part 2	133	1089
Enigma Part 1	129	1079
A Secret Message from Castle Mansfeld	125	100
Trifid Cipher	121	100
ADFGVX — Part 2	118	100
A really long number sequence	115	1081
Playfair Encryption	113	100
ADFGVX — Part 1	112	100
Number Sequence — Part 9	112	100
Double Columnar Transposition	110	100
Playfair with hints about the grid	107	100
Number Sequence — Part 10	107	100
A hidden word — Part 2	105	100
Kaskade-S/T — Part 1	101	100
Enigma Combinatorics	100	100
Zodiac Cipher	98	100
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1	96	100
Hill Cipher with Sudoku Key	96	100
ECDH-Key Exchange for Beginners	95	100
Number Sequence — Part 5	95	100
The Last Note	95	100
Factorization Cipher — Part 3	94	1081
Heartbleed — Part 1	90	0
Number Sequence — Part 7	89	100
Enigma Part 2	88	1079
Partial Key Exposure with RSA — Part 1	84	1082
Enigma Messages with Repeated Letters — Part 2	81	100
Enigma Messages with Repeated Letters — Part 3	81	100
Molehunt (Part 3/3)	80	1079
ORYX Stream Cipher Part I	79	1079
Enigma Messages with Repeated Letters — Part 5	77	100
AES key — encoded in the machine readable zone of a European ePassport	76	1082
Enigma Messages	76	100
Multilingual Monoalphabetic Substitution	75	100
Wheatstone Cryptograph — Part 1	75	100
Smartcard RSA	74	1079
BCR code (Book-Caesar-RSA)	72	1083
Enigma Messages with Repeated Letters — Part 4	72	100
Modular Sequences	71	100
Turing Bombe Enigma I	69	100
Cascading Encryption — Part 1/3	68	100
Find the right route — Part 1	68	100
Recycled One-Time Pad	66	100
Unusual encryption using a diophantine equation	65	1081
Monoalphabetic substitution with camouflage — Part 1	62	100
RSA Factoring Challenge: RSA-704	62	0
Alberti Challenge — Part 1	62	101
M-138 — Part 3	61	1089
Heartbleed — Part 2	60	0
The Einstein Enigma	59	1103
An Invisible Message	57	100
RSA Factoring Challenge: RSA-210	56	0
News from Castle Mansfeld	54	100
Summer Job	54	1105
Kaskade-S/T — Part 2	51	1080
Unconcealed RSA messages	50	1081
Monoalphabetic substitution with camouflage — Part 2	50	1081
New Year's Greetings — Part 1	50	100
Lunchtime Attack on the Fully Homomorphic Encryption Scheme	49	1080
Double Column Transposition — Part 4	49	1087
Advent-Challenge — Part 2	49	1102
ORYX Stream Cipher Part II	47	1079
Monoalphabetic substitution with camouflage — Part 4	47	100
Keyshanc — Part 1	47	1082
Monoalphabetic substitution with camouflage — Part 3	46	1081
Strange Message from Thessaloniki	46	100
New Year's Greetings — Part 2	46	100
Double Column Transposition — Part 2	45	1087
Lightweight Introduction to Lattices — Part 1	45	100
Weakened Granit — Part 1	44	100
New Year's Greetings — Part 3	44	100
Advent Challenge — Part 3	43	1102
Polyhomophonic Substitution — Part 1	43	100
Not-so-Secret Message from Malawi — Part II (ECC)	42	1079
CMEA 1	42	1079
Music Code — Part 1	42	100
Music Code — Part 2	41	1080
An 'unhearable' message	41	100
New Year's Greetings — Part 4	41	100
Pigpen with a twist — Part 2	40	1081
Pigpen with a twist — Part 3	40	1081
Double Column Transposition — Part 3	40	1087
Advent Challenge — Part 4	40	1102
Ku Klux Klan	39	Variable
RSA Factoring Challenge: RSA-220	39	0
Homophonic Encryption — Part 1	39	1112
Keyshanc — Part 2	38	1082
Kaskade-S/T — Part 3	34	1080
Fastest in the West	34	1105
Trendy Messenger	34	1105
Homophonic Encryption — Part 2	34	1112
Homophonic Encryption — Part 3	34	1112
RSA Factoring Challenge: RSA-230	33	0
Heartbleed — Part 3	33	0
Homophonic Encryption — Part 4	33	1112
Lattice Part 1	32	1080
Double Column Transposition — Part 1	32	1087
Monoalphabetic Substitution with Nostradamus Flavor	32	1110
Lightweight Introduction to Lattices — Part 2	32	100
ORYX Stream Cipher — Part 3 (revised)	31	1085
Spanish Strip Cipher — Part 1	31	1087
Monoalphabetic Substitution with Camouflage — Part 5	30	1082
Spanish Strip Cipher — Part 2	30	1087
M-138 — Part 4	30	1089
Cryptanalysis Hacking Puzzles — Part 1	29	100
Lightweight Introduction to Lattices — Part 3	29	1128
Typex — Part 1	28	1084
CMEA 2	27	13025
AES ECB Wrong Encoding	25	1102
RSA with Special d	24	13021
Typex — Part 2	24	1084
Handycipher made in love — Part 1	24	1110
Find the right route — Part 2	24	100
Find the right route — Part 3	24	100
The LoRa Cipher: Logic Randomness — Part 1	23	1121
Polyhomophonic Substitution — Part 2	23	1123
Polyphonic Substitution Cipher — Part 1	22	1118
RSA Factoring Challenge: RSA-240	21	0
RSA Factoring Challenge: RSA-232	20	0
RSA Factoring Challenge: RSA-250	20	0
Polyphonic Substitution Cipher — Part 2	20	1120
Purple 1	19	1079
Breaking a Filter Generator	19	1107
The T52 Sturgeon Challenge — Part 1	19	1114
Handycipher made in love — Part 2	18	1113
Cascading Encryption — Part 2/3	17	1084
ASAC — A Strong(er) ADFGVX Cipher — Part 1	17	1095
The T52 Sturgeon Challenge — Part 2	17	1114
A Cloaked Substitution Cipher — Part 1	17	1115
Cipher ID — Part 1	17	1118
Sigaba Part 1	16	1079
Concealed Messages — Vigenère's Night Sky	16	0
Flawed Usage of a OTP Cipher by the BND	16	1091
A Cloaked Substitution Cipher — Part 2	16	1115
The SZ42 Challenge — Part 1	16	1128
The SZ42 Challenge — Part 2	16	1128
Weakened Handycipher — Part 1	15	1090
New Year's Greetings — Part 5	15	1093
Polyhomophonic Substitution — Part 3	15	1123
Weakened Handycipher — Part 3	14	1090
The T52 Sturgeon Challenge — Part 3	14	1114
The SZ42 Challenge — Part 3	14	1129
The SZ42 Challenge — Part 4	14	1130
Weakened Handycipher — Part 2	13	1090
The SZ42 Challenge — Part 5	13	1130
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2	12	1080
Cascading Encryption — Part 3/3	12	1084
ORYX Stream Cipher — Part 4a	12	1087
The T52 Sturgeon Challenge — Part 4	12	1114
The SZ42 Challenge — Part 6	11	1131
The SZ42 Challenge — Part 8	11	1133
Wheatstone Cryptograph — Part 2	11	1148
Akelarre Part 1	10	1079
Kaskade-S/T — Part 5	10	1080
The SZ42 Challenge — Part 7	10	1133
The SZ42 Challenge — Part 9	10	1136
Double Column Transposition — Part 5	9	1088
Hilly — Part 1	9	1097
The T52 Sturgeon Challenge — Part 8	9	1115
The SIGABA Challenge — Part 1	9	1122
The T52 Sturgeon Challenge — Part 11	8	1115
The SIGABA Challenge — Part 2	8	1122
The SZ42 Challenge — Part 12	8	1164
The SZ42 Challenge — Part 13	8	1164
Handycipher — Part 2	7	1090
Holographic Encryption — Part 1	7	1098
"The Road" — Part 1	7	1109
The T52 Sturgeon Challenge — Part 9	7	1115
The T52 Sturgeon Challenge — Part 12	7	1115
Modified Vigenère Cipher	7	1186
Handycipher — Part 3	6	13209
Kaskade-S/T — Part 6 (RansomKaskade Part 1)	6	1099
Weakened ElsieFour — Part 1	6	1104
The T52 Sturgeon Challenge — Part 10	6	1115
The T52 Sturgeon Challenge — Part 5	6	1115
The T52 Sturgeon Challenge — Part 6	6	1115
The T52 Sturgeon Challenge — Part 7	6	1115
The SIGABA Challenge — Part 3	6	13731
Sigaba Part 2	5	13021
Handycipher — Part 1	5	1090
Spirale — Part 1	5	1091
Spirale — Part 2	5	1091
Handycipher — Part 5	5	13293
Handycipher — Part 6	5	13293
Weakened Handycipher — Part 4	5	1095
Weakened Handycipher — Part 5	5	1095
Weakened Handycipher — Part 6	5	1095
The SIGABA Challenge — Part 4	5	13734
Alberti Challenge — Part 2	5	1234
Notes of an Italian Soldier	4	0
Spirale — Part 3	4	1091
Handycipher — Part 4	4	13293
ElsieFour — Part 1	4	13396
Weakened ElsieFour — Part 3	4	1101
The Heavy T52 Sturgeon Challenge — Part 4	4	13751
The Heavy T52 Sturgeon Challenge — Part 7	4	13756
The SZ42 Challenge — Part 10	4	1139
The SZ42 Challenge — Part 11	4	1139
Extended Handycipher — Part 1	3	1090
Extended Handycipher — Part 2	3	1090
Extended Handycipher — Part 3	3	1090
Extended Handycipher — Part 4	3	13293
Extended Handycipher — Part 5	3	13293
Handycipher — Part 8	3	13336
Handycipher — Part 9	3	13336
Holographic Encryption — Part 2	3	1098
The Vatican Challenge — Part 1	3	0
The Vatican Challenge — Part 2	3	0
Christmas Challenge 2019: Differential Cryptanalysis — Part 1	3	1119
Differential Cryptanalysis — Part 2	3	1121
The Heavy T52 Sturgeon Challenge — Part 5	3	13755
Double Column Transposition	2	0
Unknown Author	2	Variable
ORYX Stream Cipher — Part 4b	2	13162
Extended Handycipher — Part 6	2	13293
Handycipher — Part 7	2	13336
Catherine of Aragon's Letter to King Ferdinand, her Father (1509)	2	Variable
The Heavy T52 Sturgeon Challenge — Part 2	2	13650
The Heavy T52 Sturgeon Challenge — Part 3	2	13658
The SIGABA Challenge — Part 5	2	13739
The Heavy T52 Sturgeon Challenge — Part 6	2	13755
The Heavy T52 Sturgeon Challenge — Part 9	2	13760
SIGABA CSP-889 — Part 1	2	1149
SIGABA CSP-889 — Part 2	2	1149
SIGABA CSP-889 — Part 3	2	14110
SIGABA CSP-2900 — Part 1	2	1155
SIGABA CSP-2900 — Part 2	2	1155
SIGABA CSP-2900 — Part 3	2	14196
Beale Ciphers	1	Variable
Substitution Cipher with Non-Prefix Codes	1	13043
Monoalphabetic Substitution with Camouflage — Part 6	1	1083
ASAC — A Strong(er) ADFGVX Cipher — Part 2	1	1095
Hilly — Part 2	1	1101
Weakened ElsieFour — Part 2	1	1104
"The Road" — Part 2	1	1109
Handycipher — Part 10	1	1114
The Vatican Challenge — Part 4	1	Variable
The Heavy T52 Sturgeon Challenge — Part 1	1	13646
The SIGABA Challenge — Part 6	1	13745
D'Agapeyeff	0	Variable
Dorabella	0	Variable
Kryptos	0	Variable
World Record Challenge: Break 65 Bits of AES	0	13021
Recovering the Private Key in the Fully Homomorphic Encryption Scheme	0	13029
Twelve-Year-Old Murder Case	0	Variable
Kaskade-S/T — Part 4	0	1080
Digital Signatures: DSA with Medium Fields	0	13051
The third ENIGMA M4 message	0	Variable
RSA Factoring Challenge: RSA-260	0	13067
RSA Factoring Challenge: RSA-270	0	13067
RSA Factoring Challenge: RSA-896	0	13067
RSA Factoring Challenge: RSA-280	0	13067
RSA Factoring Challenge: RSA-290	0	13067
RSA Factoring Challenge: RSA-300	0	13067
RSA Factoring Challenge: RSA-309	0	13067
RSA Factoring Challenge: RSA-1024	0	13067
RSA Factoring Challenge: RSA-310	0	13067
RSA Factoring Challenge: RSA-320	0	13067
RSA Factoring Challenge: RSA-330	0	13067
RSA Factoring Challenge: RSA-340	0	13067
RSA Factoring Challenge: RSA-350	0	13067
RSA Factoring Challenge: RSA-360	0	13067
RSA Factoring Challenge: RSA-370	0	13067
RSA Factoring Challenge: RSA-380	0	13067
RSA Factoring Challenge: RSA-390	0	13067
RSA Factoring Challenge: RSA-400	0	13067
RSA Factoring Challenge: RSA-410	0	13067
RSA Factoring Challenge: RSA-420	0	13067
RSA Factoring Challenge: RSA-430	0	13067
RSA Factoring Challenge: RSA-440	0	13067
RSA Factoring Challenge: RSA-450	0	13067
RSA Factoring Challenge: RSA-460	0	13067
RSA Factoring Challenge: RSA-1536	0	13067
RSA Factoring Challenge: RSA-470	0	13067
RSA Factoring Challenge: RSA-480	0	13067
RSA Factoring Challenge: RSA-490	0	13067
RSA Factoring Challenge: RSA-500	0	13067
RSA Factoring Challenge: RSA-617	0	13067
RSA Factoring Challenge: RSA-2048	0	13067
ORYX Stream Cipher — Part 4d	0	13125
Double Column Transposition Reloaded — Part 1	0	13146
Double Column Transposition Reloaded — Part 2	0	13146
Double Column Transposition Reloaded — Part 3	0	13146
Spanish Strip Cipher — Part 3	0	Variable
ORYX Stream Cipher — Part 4c	0	13162
Double-Column Transposition/Granit — Part 1	0	1091
Double-Column Transposition/Granit — Part 2	0	1091
Double-Column Transposition/Granit — Part 3	0	1091
Spirale — Part 4	0	13237
Weakened Granit — Part 2	0	1092
Weakened Granit — Part 3	0	1092
ASAC — A Strong(er) ADFGVX Cipher — Part 3	0	1095
ASAC — A Strong(er) ADFGVX Cipher — Part 4	0	1095
ASAC — A Strong(er) ADFGVX Cipher — Part 5	0	1095
"The Road" — Part 3	0	1109
The Vatican Challenge — Part 3	0	Variable
The Vatican Challenge — Part 5	0	Variable
The Heavy T52 Sturgeon Challenge — Part 8	0	13757