All Challenges (Compact)

358 published challenges (in level I, II, III and X), sorted by:
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LevelNameNumber of
Solvers
Available
Points
Published on
Number Sequence4305100Oct. 14, 2010
Original Caesar Cipher3024100Dec. 15, 2010
Number Sequence — Part 22116100July 11, 2011
Caesar Encryption1447100Oct. 21, 2010
Beaver Code1194100Aug. 13, 2012
Letter to the Templars — Part 11028100July 16, 2012
Number Sequence — Part 31018100March 30, 2012
Number Sequence — Part 4843100April 18, 2012
A hidden word839100Jan. 6, 2013
Letter to the Templars — Part 2825100July 30, 2012
Letter to the Templars — Part 37081082Oct. 9, 2012
Affine Codes / Modulo Arithmetic with N / Extended Euclid594100Sept. 9, 2011
Monoalphabetic Substitution550100Oct. 14, 2010
Cracking SHA1-Hashed Passwords5471079April 4, 2011
Factorization Cipher — Part 1500100Oct. 17, 2011
Grille Cipher489100Oct. 14, 2011
Advent-Challenge — Part 1468100Dec. 8, 2017
Number Sequence — Part 8397100Sept. 14, 2015
A modified homophonic cipher with reduced alphabets — Part 1393100Oct. 21, 2010
A modified homophonic cipher with reduced alphabets — Part 2340100Oct. 21, 2010
One-Time Pad with Flaws311100Nov. 12, 2010
Alice's Birthday Party (Part 1)3031078Oct. 14, 2010
Snow White and the seven dwarfs293100April 20, 2013
Alice's Birthday Party (Part 2)2911078Oct. 14, 2010
From Russia with Love285100Sept. 4, 2013
Broadcasting and low exponent — RSA Attack2351079July 22, 2011
Modified Caesar Cipher228100Sept. 2, 2011
How do you become a big cryptographer?225100May 28, 2012
M-138 — Part 1218100Dec. 24, 2014
Not-so-Secret Message from Malawi — Part I (RSA)2031078Oct. 14, 2010
Brute-Force-Attack on Triple-DES with Reduced Key Space2001078Oct. 14, 2010
Reserve Hand Procedure — Part 1193100March 6, 2013
Cryptanalysis Hacking Puzzles — Part 2188100Jan. 9, 2019
Classical Ciphers^3186100Oct. 14, 2010
Letter from the Alleged Countess Julie von Ortenburg179100Oct. 14, 2010
Enigma Messages with Repeated Letters — Part 1178100Sept. 26, 2013
Hybrid Encryption I1751078Nov. 2, 2010
Nils away on travel173100Aug. 8, 2013
Autokey Cipher171100Sept. 25, 2018
¿No Hablas Español? No problemo!164100April 18, 2012
Number Sequence — Part 6161100March 23, 2015
Molehunt (Part 1/3)158100Oct. 23, 2010
RSA: Two different keys — same ciphertext1571080Aug. 15, 2011
Pigpen with a twist — Part 1155100Sept. 5, 2011
Image Noise153100Nov. 20, 2015
The Book Code: A Challenge for Bookworms151100March 21, 2012
Factorization Cipher — Part 21491080Dec. 1, 2011
Molehunt (Part 2/3)148100Oct. 23, 2010
M-138 — Part 21371087Dec. 24, 2014
Enigma Part 11301078Oct. 14, 2010
A Secret Message from Castle Mansfeld129100Oct. 14, 2010
Trifid Cipher126100Oct. 28, 2013
ADFGVX — Part 2123100Aug. 15, 2011
Playfair Encryption122100Dec. 22, 2010
A really long number sequence1191080Sept. 5, 2011
ADFGVX — Part 1118100Aug. 15, 2011
Number Sequence — Part 9118100Nov. 16, 2017
Double Columnar Transposition117100Oct. 12, 2011
Playfair with hints about the grid116100Jan. 16, 2013
Number Sequence — Part 10115100April 18, 2018
Alberti Challenge — Part 1114100March 26, 2022
A hidden word — Part 2111100April 16, 2015
Enigma Combinatorics107100Nov. 12, 2010
The Syllabary Cipher – Part 1106101Oct. 28, 2022
Kaskade-S/T — Part 1105100March 4, 2011
Hill Cipher with Sudoku Key105100Sept. 4, 2013
Zodiac Cipher100100Oct. 14, 2010
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 199100April 7, 2011
ECDH-Key Exchange for Beginners98100Feb. 24, 2012
The Last Note98100Sept. 22, 2014
Number Sequence — Part 597100April 18, 2012
Factorization Cipher — Part 3961080Jan. 6, 2012
Wheatstone Cryptograph — Part 196100April 21, 2021
Number Sequence — Part 792100March 23, 2015
Enigma Part 2901078Oct. 14, 2010
Heartbleed — Part 1900Aug. 28, 2014
Partial Key Exposure with RSA — Part 1861080Feb. 11, 2012
Enigma Messages with Repeated Letters — Part 285100Oct. 28, 2013
Enigma Messages with Repeated Letters — Part 385100March 5, 2014
Find the right route — Part 184100Oct. 27, 2020
Molehunt (Part 3/3)821078Oct. 23, 2010
ORYX Stream Cipher Part I801078Oct. 14, 2010
Enigma Messages with Repeated Letters — Part 580100March 5, 2014
AES key — encoded in the machine readable zone of a European ePassport791080Jan. 16, 2012
Enigma Messages79100Jan. 23, 2013
Multilingual Monoalphabetic Substitution78100Jan. 30, 2013
Modular Sequences77100Sept. 25, 2018
Enigma Messages with Repeated Letters — Part 476100March 5, 2014
Smartcard RSA751078Oct. 25, 2010
BCR code (Book-Caesar-RSA)731082Sept. 12, 2012
Cascading Encryption — Part 1/372100Jan. 25, 2013
Turing Bombe Enigma I71100Oct. 17, 2011
Recycled One-Time Pad67100Nov. 20, 2012
Unusual encryption using a diophantine equation661080Sept. 2, 2011
RSA Factoring Challenge: RSA-704650July 31, 2013
Monoalphabetic substitution with camouflage — Part 164100Oct. 27, 2011
M-138 — Part 3631087Dec. 24, 2014
The Einstein Enigma621099Feb. 7, 2018
RSA Factoring Challenge: RSA-210610Feb. 7, 2012
Heartbleed — Part 2600Aug. 28, 2014
An Invisible Message59100Oct. 17, 2011
News from Castle Mansfeld58100Nov. 13, 2015
Summer Job571101June 12, 2018
Lightweight Introduction to Lattices — Part 155100May 16, 2020
Kaskade-S/T — Part 2531079March 4, 2011
New Year's Greetings — Part 153100March 21, 2016
Unconcealed RSA messages521080Nov. 2, 2011
Monoalphabetic substitution with camouflage — Part 2521080Dec. 7, 2011
Advent-Challenge — Part 2521099Dec. 16, 2017
Polyhomophonic Substitution — Part 152100March 22, 2020
Strange Message from Thessaloniki51100Dec. 10, 2012
Double Column Transposition — Part 4511086May 19, 2014
Lunchtime Attack on the Fully Homomorphic Encryption Scheme491078Jan. 14, 2011
New Year's Greetings — Part 249100March 21, 2016
ORYX Stream Cipher Part II481078Oct. 14, 2010
Monoalphabetic substitution with camouflage — Part 448100Dec. 21, 2011
Keyshanc — Part 1481081May 21, 2012
Weakened Granit — Part 148100Sept. 24, 2015
Monoalphabetic substitution with camouflage — Part 3471080Dec. 7, 2011
New Year's Greetings — Part 347100March 21, 2016
Double Column Transposition — Part 2461085May 2, 2014
RSA Factoring Challenge: RSA-220450Feb. 7, 2012
Advent Challenge — Part 3451099Dec. 22, 2017
CMEA 1441078Dec. 6, 2010
New Year's Greetings — Part 444100March 21, 2016
Not-so-Secret Message from Malawi — Part II (ECC)431078Oct. 14, 2010
Advent Challenge — Part 4431099Dec. 21, 2017
Merkle-Hellman Knapsack Challenge - Part 143101Oct. 14, 2022
Music Code — Part 142100May 17, 2011
Music Code — Part 2421079May 17, 2011
Homophonic Encryption — Part 1421107May 4, 2019
Ku Klux Klan41VariableOct. 14, 2010
Pigpen with a twist — Part 2411080Sept. 2, 2011
Pigpen with a twist — Part 3411080Sept. 2, 2011
An 'unhearable' message41100June 5, 2012
Double Column Transposition — Part 3411085May 2, 2014
Keyshanc — Part 2391081May 21, 2012
Lightweight Introduction to Lattices — Part 239100June 23, 2020
RSA Factoring Challenge: RSA-230380Feb. 7, 2012
Fastest in the West381101June 12, 2018
Homophonic Encryption — Part 2371107May 8, 2019
Kaskade-S/T — Part 3361079March 4, 2011
Monoalphabetic Substitution with Nostradamus Flavor361106Feb. 16, 2019
Homophonic Encryption — Part 3361107May 8, 2019
Homophonic Encryption — Part 4351107May 8, 2019
Lightweight Introduction to Lattices — Part 3351119July 16, 2020
Trendy Messenger341101June 12, 2018
Lattice Part 1331079March 11, 2011
Double Column Transposition — Part 1331085April 4, 2014
Heartbleed — Part 3330Aug. 28, 2014
Spanish Strip Cipher — Part 1321085March 27, 2014
Cryptanalysis Hacking Puzzles — Part 132100Oct. 26, 2018
ORYX Stream Cipher — Part 3 (revised)311083June 6, 2013
Spanish Strip Cipher — Part 2311085March 27, 2014
M-138 — Part 4311087Dec. 24, 2014
Monoalphabetic Substitution with Camouflage — Part 5301081March 9, 2012
Find the right route — Part 230100Dec. 19, 2020
CMEA 22913005Dec. 6, 2010
Typex — Part 1291083Feb. 28, 2013
Polyhomophonic Substitution — Part 2291115March 28, 2020
Find the right route — Part 328100Dec. 26, 2020
AES ECB Wrong Encoding271099Dec. 16, 2017
The LoRa Cipher: Logic Randomness — Part 1271114Feb. 19, 2020
RSA Factoring Challenge: RSA-232260Feb. 7, 2012
RSA Factoring Challenge: RSA-240260Feb. 7, 2012
RSA Factoring Challenge: RSA-250250Feb. 7, 2012
Typex — Part 2251083April 3, 2013
Handycipher made in love — Part 1251106Feb. 16, 2019
RSA with Special d2413001Oct. 14, 2010
Polyphonic Substitution Cipher — Part 1231112Nov. 21, 2019
Polyphonic Substitution Cipher — Part 2211113Jan. 14, 2020
The Syllabary Cipher – Part 2211203Oct. 28, 2022
Purple 1201078Oct. 27, 2010
Breaking a Filter Generator201103Sept. 25, 2018
ASAC — A Strong(er) ADFGVX Cipher — Part 1191092July 9, 2016
Handycipher made in love — Part 2191107May 21, 2019
The T52 Sturgeon Challenge — Part 1191109July 13, 2019
A Cloaked Substitution Cipher — Part 1191109Aug. 21, 2019
Flawed Usage of a OTP Cipher by the BND181089Aug. 23, 2015
The T52 Sturgeon Challenge — Part 2181109July 22, 2019
A Cloaked Substitution Cipher — Part 2181110Aug. 25, 2019
Polyhomophonic Substitution — Part 3181115April 6, 2020
Sigaba Part 1171078Oct. 14, 2010
Cascading Encryption — Part 2/3171083March 25, 2013
Cipher ID — Part 1171112Nov. 19, 2019
The SZ42 Challenge — Part 1171119July 22, 2020
The SZ42 Challenge — Part 2171119Aug. 5, 2020
Concealed Messages — Vigenère's Night Sky160May 1, 2012
New Year's Greetings — Part 5161091March 21, 2016
The SZ42 Challenge — Part 4161120Aug. 29, 2020
The Syllabary Cipher – Part 3161203Oct. 28, 2022
Weakened Handycipher — Part 1151088May 13, 2015
The SZ42 Challenge — Part 3151120Aug. 15, 2020
The SZ42 Challenge — Part 5151120Sept. 3, 2020
Weakened Handycipher — Part 3141088May 13, 2015
The T52 Sturgeon Challenge — Part 3141109July 22, 2019
Weakened Handycipher — Part 2131088May 13, 2015
The SZ42 Challenge — Part 6131121Oct. 2, 2020
The SZ42 Challenge — Part 8131123Oct. 31, 2020
Wheatstone Cryptograph — Part 2131132May 21, 2021
Merkle-Hellman Knapsack Challenge — Part 2131198Oct. 14, 2022
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2121079April 13, 2011
Cascading Encryption — Part 3/3121083March 29, 2013
ORYX Stream Cipher — Part 4a121085April 14, 2014
The T52 Sturgeon Challenge — Part 4121109July 22, 2019
The SZ42 Challenge — Part 7121122Oct. 27, 2020
The SZ42 Challenge — Part 9121124Dec. 19, 2020
The Josse Challenge – Part 1111288Feb. 10, 2023
Akelarre Part 1101078Nov. 24, 2010
Kaskade-S/T — Part 5101079May 5, 2011
The SIGABA Challenge — Part 1101114Feb. 29, 2020
Modified Vigenère Cipher101150Jan. 24, 2022
Hill Cipher101185Sept. 4, 2022
The Syllabary Cipher – Part 4101203Oct. 28, 2022
The Syllabary Cipher – Part 5101203Oct. 28, 2022
The Josse Challenge – Part 2101324Feb. 25, 2023
Double Column Transposition — Part 591086June 23, 2014
Hilly — Part 191094Jan. 25, 2017
The T52 Sturgeon Challenge — Part 891109Aug. 10, 2019
The SIGABA Challenge — Part 291115March 5, 2020
The SZ42 Challenge — Part 1291141Oct. 6, 2021
The T52 Sturgeon Challenge — Part 1181109Aug. 10, 2019
The T52 Sturgeon Challenge — Part 1281109Aug. 10, 2019
The SZ42 Challenge — Part 1381141Oct. 6, 2021
Alberti Challenge — Part 281163May 14, 2022
Handycipher — Part 271088March 3, 2015
Holographic Encryption — Part 171095April 7, 2017
"The Road" — Part 171104Dec. 8, 2018
The T52 Sturgeon Challenge — Part 971109Aug. 10, 2019
The T52 Sturgeon Challenge — Part 1071109Aug. 10, 2019
Handycipher — Part 3613176March 3, 2015
Spirale — Part 161089Aug. 23, 2015
Spirale — Part 261089Aug. 23, 2015
Kaskade-S/T — Part 6 (RansomKaskade Part 1)61096July 2, 2017
Weakened ElsieFour — Part 161100April 28, 2018
The T52 Sturgeon Challenge — Part 561109Aug. 10, 2019
The T52 Sturgeon Challenge — Part 661109Aug. 10, 2019
The T52 Sturgeon Challenge — Part 761109Aug. 10, 2019
The SIGABA Challenge — Part 3613618March 11, 2020
The Josse Challenge – Part 361660March 27, 2023
Sigaba Part 2513001Oct. 14, 2010
Handycipher — Part 151088March 3, 2015
Spirale — Part 351089Aug. 23, 2015
Handycipher — Part 5513252June 28, 2016
Handycipher — Part 6513252June 28, 2016
Weakened Handycipher — Part 451092June 28, 2016
Weakened Handycipher — Part 551092June 28, 2016
Weakened Handycipher — Part 651092June 28, 2016
The SIGABA Challenge — Part 4513621March 17, 2020
The Heavy T52 Sturgeon Challenge — Part 7513637April 23, 2020
The SZ42 Challenge — Part 1051126Jan. 30, 2021
Notes of an Italian Soldier40Oct. 14, 2010
Handycipher — Part 4413252June 28, 2016
ElsieFour — Part 1413343Oct. 3, 2017
Weakened ElsieFour — Part 341098Oct. 3, 2017
Christmas Challenge 2019: Differential Cryptanalysis — Part 141113Dec. 22, 2019
Differential Cryptanalysis — Part 241113Jan. 28, 2020
The Heavy T52 Sturgeon Challenge — Part 4413633April 15, 2020
The Heavy T52 Sturgeon Challenge — Part 5413636April 21, 2020
The SZ42 Challenge — Part 1141126Jan. 30, 2021
Extended Handycipher — Part 131088March 27, 2015
Extended Handycipher — Part 231088March 27, 2015
Extended Handycipher — Part 331088March 27, 2015
Extended Handycipher — Part 4313252June 28, 2016
Extended Handycipher — Part 5313252June 28, 2016
Handycipher — Part 8313290Jan. 21, 2017
Handycipher — Part 9313290Jan. 21, 2017
Holographic Encryption — Part 231095April 7, 2017
The Vatican Challenge — Part 130Feb. 14, 2018
The Vatican Challenge — Part 230Feb. 14, 2018
The Heavy T52 Sturgeon Challenge — Part 6313636April 22, 2020
Double Column Transposition20Oct. 14, 2010
Unknown Author2VariableOct. 14, 2010
ORYX Stream Cipher — Part 4b213133April 14, 2014
Extended Handycipher — Part 6213252June 28, 2016
Handycipher — Part 7213290Jan. 21, 2017
Catherine of Aragon's Letter to King Ferdinand, her Father (1509)2VariableNov. 28, 2018
The Heavy T52 Sturgeon Challenge — Part 2213554Oct. 9, 2019
The Heavy T52 Sturgeon Challenge — Part 3213561Oct. 26, 2019
The SIGABA Challenge — Part 5213624March 26, 2020
The Heavy T52 Sturgeon Challenge — Part 9213640April 30, 2020
SIGABA CSP-889 — Part 121132June 1, 2021
SIGABA CSP-889 — Part 221132June 1, 2021
SIGABA CSP-889 — Part 3213881June 1, 2021
SIGABA CSP-2900 — Part 121136July 31, 2021
SIGABA CSP-2900 — Part 221136July 31, 2021
SIGABA CSP-2900 — Part 3213933July 31, 2021
Beale Ciphers1VariableOct. 14, 2010
Substitution Cipher with Non-Prefix Codes113022June 15, 2011
Monoalphabetic Substitution with Camouflage — Part 611081June 30, 2012
ASAC — A Strong(er) ADFGVX Cipher — Part 211092July 9, 2016
Hilly — Part 211098Oct. 17, 2017
Weakened ElsieFour — Part 211100April 28, 2018
"The Road" — Part 211104Dec. 8, 2018
Handycipher — Part 1011108June 25, 2019
The Vatican Challenge — Part 41VariableJuly 7, 2019
The Heavy T52 Sturgeon Challenge — Part 1113551Sept. 30, 2019
The SIGABA Challenge — Part 6113629April 5, 2020
D'Agapeyeff0VariableOct. 14, 2010
Dorabella0VariableOct. 14, 2010
Kryptos0VariableOct. 14, 2010
World Record Challenge: Break 65 Bits of AES013001Oct. 14, 2010
Recovering the Private Key in the Fully Homomorphic Encryption Scheme013009Jan. 14, 2011
Twelve-Year-Old Murder Case0VariableApril 7, 2011
Kaskade-S/T — Part 401079May 5, 2011
Digital Signatures: DSA with Medium Fields013030Sept. 2, 2011
The third ENIGMA M4 message0VariableSept. 21, 2011
RSA Factoring Challenge: RSA-260013045Feb. 7, 2012
RSA Factoring Challenge: RSA-270013045Feb. 7, 2012
RSA Factoring Challenge: RSA-896013045Feb. 7, 2012
RSA Factoring Challenge: RSA-280013045Feb. 7, 2012
RSA Factoring Challenge: RSA-290013045Feb. 7, 2012
RSA Factoring Challenge: RSA-300013045Feb. 7, 2012
RSA Factoring Challenge: RSA-309013045Feb. 7, 2012
RSA Factoring Challenge: RSA-1024013045Feb. 7, 2012
RSA Factoring Challenge: RSA-310013045Feb. 7, 2012
RSA Factoring Challenge: RSA-320013045Feb. 7, 2012
RSA Factoring Challenge: RSA-330013045Feb. 7, 2012
RSA Factoring Challenge: RSA-340013045Feb. 7, 2012
RSA Factoring Challenge: RSA-350013045Feb. 7, 2012
RSA Factoring Challenge: RSA-360013045Feb. 7, 2012
RSA Factoring Challenge: RSA-370013045Feb. 7, 2012
RSA Factoring Challenge: RSA-380013045Feb. 7, 2012
RSA Factoring Challenge: RSA-390013045Feb. 7, 2012
RSA Factoring Challenge: RSA-400013045Feb. 7, 2012
RSA Factoring Challenge: RSA-410013045Feb. 7, 2012
RSA Factoring Challenge: RSA-420013045Feb. 7, 2012
RSA Factoring Challenge: RSA-430013045Feb. 7, 2012
RSA Factoring Challenge: RSA-440013045Feb. 7, 2012
RSA Factoring Challenge: RSA-450013045Feb. 7, 2012
RSA Factoring Challenge: RSA-460013045Feb. 7, 2012
RSA Factoring Challenge: RSA-1536013045Feb. 7, 2012
RSA Factoring Challenge: RSA-470013045Feb. 7, 2012
RSA Factoring Challenge: RSA-480013045Feb. 7, 2012
RSA Factoring Challenge: RSA-490013045Feb. 7, 2012
RSA Factoring Challenge: RSA-500013045Feb. 7, 2012
RSA Factoring Challenge: RSA-617013045Feb. 7, 2012
RSA Factoring Challenge: RSA-2048013045Feb. 7, 2012
ORYX Stream Cipher — Part 4d013098June 27, 2013
Double Column Transposition Reloaded — Part 1013118Dec. 11, 2013
Double Column Transposition Reloaded — Part 2013118Dec. 11, 2013
Double Column Transposition Reloaded — Part 3013118Dec. 11, 2013
Spanish Strip Cipher — Part 30VariableMarch 27, 2014
ORYX Stream Cipher — Part 4c013133April 14, 2014
Double-Column Transposition/Granit — Part 101089July 1, 2015
Double-Column Transposition/Granit — Part 201089July 1, 2015
Double-Column Transposition/Granit — Part 301089July 1, 2015
Spirale — Part 4013201Aug. 23, 2015
Weakened Granit — Part 201089Sept. 24, 2015
Weakened Granit — Part 301089Sept. 24, 2015
ASAC — A Strong(er) ADFGVX Cipher — Part 301092July 9, 2016
ASAC — A Strong(er) ADFGVX Cipher — Part 401092July 9, 2016
ASAC — A Strong(er) ADFGVX Cipher — Part 501092July 9, 2016
"The Road" — Part 301104Dec. 8, 2018
The Vatican Challenge — Part 30VariableJune 25, 2019
The Vatican Challenge — Part 50VariableJuly 7, 2019
The Heavy T52 Sturgeon Challenge — Part 8013638April 24, 2020
A Heavy SZ42 Challenge – Part 14015173Dec. 30, 2022

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