All Challenges (Compact)

362 published challenges (in level I, II, III and X), sorted by:
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LevelNameNumber of
Solvers
Available
Points
Published on
Number Sequence4353100Oct. 14, 2010
Original Caesar Cipher3069100Dec. 15, 2010
Number Sequence — Part 22143100July 11, 2011
Caesar Encryption1467100Oct. 21, 2010
Beaver Code1214100Aug. 13, 2012
Letter to the Templars — Part 11044100July 16, 2012
Number Sequence — Part 31027100March 30, 2012
A hidden word858100Jan. 6, 2013
Number Sequence — Part 4849100April 18, 2012
Letter to the Templars — Part 2839100July 30, 2012
Letter to the Templars — Part 37151081Oct. 9, 2012
Affine Codes / Modulo Arithmetic with N / Extended Euclid602100Sept. 9, 2011
Cracking SHA1-Hashed Passwords5711078April 4, 2011
Monoalphabetic Substitution556100Oct. 14, 2010
Factorization Cipher — Part 1513100Oct. 17, 2011
Grille Cipher499100Oct. 14, 2011
Advent-Challenge — Part 1498100Dec. 8, 2017
Number Sequence — Part 8405100Sept. 14, 2015
A modified homophonic cipher with reduced alphabets — Part 1398100Oct. 21, 2010
A modified homophonic cipher with reduced alphabets — Part 2343100Oct. 21, 2010
One-Time Pad with Flaws315100Nov. 12, 2010
Alice's Birthday Party (Part 1)3041077Oct. 14, 2010
Snow White and the seven dwarfs295100April 20, 2013
From Russia with Love293100Sept. 4, 2013
Alice's Birthday Party (Part 2)2921077Oct. 14, 2010
Broadcasting and low exponent — RSA Attack2391079July 22, 2011
Modified Caesar Cipher233100Sept. 2, 2011
How do you become a big cryptographer?230100May 28, 2012
M-138 — Part 1224100Dec. 24, 2014
Brute-Force-Attack on Triple-DES with Reduced Key Space2051077Oct. 14, 2010
Cryptanalysis Hacking Puzzles — Part 2205100Jan. 9, 2019
Not-so-Secret Message from Malawi — Part I (RSA)2031077Oct. 14, 2010
Reserve Hand Procedure — Part 1195100March 6, 2013
Classical Ciphers^3188100Oct. 14, 2010
Autokey Cipher188100Sept. 25, 2018
The Syllabary Cipher – Part 1185100Oct. 28, 2022
Letter from the Alleged Countess Julie von Ortenburg181100Oct. 14, 2010
Enigma Messages with Repeated Letters — Part 1179100Sept. 26, 2013
Hybrid Encryption I1781077Nov. 2, 2010
Nils away on travel175100Aug. 8, 2013
¿No Hablas Español? No problemo!168100April 18, 2012
Number Sequence — Part 6163100March 23, 2015
Image Noise161100Nov. 20, 2015
Molehunt (Part 1/3)159100Oct. 23, 2010
RSA: Two different keys — same ciphertext1571079Aug. 15, 2011
Pigpen with a twist — Part 1156100Sept. 5, 2011
The Book Code: A Challenge for Bookworms153100March 21, 2012
Molehunt (Part 2/3)150100Oct. 23, 2010
Factorization Cipher — Part 21501079Dec. 1, 2011
M-138 — Part 21381086Dec. 24, 2014
Enigma Part 11321077Oct. 14, 2010
A Secret Message from Castle Mansfeld131100Oct. 14, 2010
Alberti Challenge — Part 1131100March 26, 2022
Playfair Encryption128100Dec. 22, 2010
Trifid Cipher128100Oct. 28, 2013
ADFGVX — Part 2126100Aug. 15, 2011
ADFGVX — Part 1121100Aug. 15, 2011
A really long number sequence1201079Sept. 5, 2011
Number Sequence — Part 9120100Nov. 16, 2017
Playfair with hints about the grid119100Jan. 16, 2013
Double Columnar Transposition118100Oct. 12, 2011
Number Sequence — Part 10118100April 18, 2018
A hidden word — Part 2113100April 16, 2015
Enigma Combinatorics107100Nov. 12, 2010
Kaskade-S/T — Part 1107100March 4, 2011
Hill Cipher with Sudoku Key107100Sept. 4, 2013
Number Sequence — Part 5104100April 18, 2012
Wheatstone Cryptograph — Part 1102100April 21, 2021
Zodiac Cipher101100Oct. 14, 2010
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1100100April 7, 2011
ECDH-Key Exchange for Beginners100100Feb. 24, 2012
The Last Note99100Sept. 22, 2014
Factorization Cipher — Part 3971079Jan. 6, 2012
Number Sequence — Part 797100March 23, 2015
Enigma Part 2911077Oct. 14, 2010
Heartbleed — Part 1900Aug. 28, 2014
Find the right route — Part 190100Oct. 27, 2020
Partial Key Exposure with RSA — Part 1881080Feb. 11, 2012
Enigma Messages with Repeated Letters — Part 286100Oct. 28, 2013
Enigma Messages with Repeated Letters — Part 386100March 5, 2014
Molehunt (Part 3/3)821077Oct. 23, 2010
Enigma Messages82100Jan. 23, 2013
Enigma Messages with Repeated Letters — Part 582100March 5, 2014
AES key — encoded in the machine readable zone of a European ePassport811079Jan. 16, 2012
ORYX Stream Cipher Part I801077Oct. 14, 2010
Multilingual Monoalphabetic Substitution79100Jan. 30, 2013
Modular Sequences79100Sept. 25, 2018
Enigma Messages with Repeated Letters — Part 478100March 5, 2014
Smartcard RSA761077Oct. 25, 2010
BCR code (Book-Caesar-RSA)751081Sept. 12, 2012
Turing Bombe Enigma I73100Oct. 17, 2011
Cascading Encryption — Part 1/373100Jan. 25, 2013
Unusual encryption using a diophantine equation691079Sept. 2, 2011
Recycled One-Time Pad69100Nov. 20, 2012
Monoalphabetic substitution with camouflage — Part 166100Oct. 27, 2011
RSA Factoring Challenge: RSA-704660July 31, 2013
M-138 — Part 3651086Dec. 24, 2014
RSA Factoring Challenge: RSA-210620Feb. 7, 2012
The Einstein Enigma621097Feb. 7, 2018
An Invisible Message61100Oct. 17, 2011
Merkle-Hellman Knapsack Challenge - Part 161100Oct. 14, 2022
Heartbleed — Part 2600Aug. 28, 2014
News from Castle Mansfeld59100Nov. 13, 2015
Summer Job571098June 12, 2018
Lightweight Introduction to Lattices — Part 156100May 16, 2020
Advent-Challenge — Part 2551096Dec. 16, 2017
Monoalphabetic substitution with camouflage — Part 2541079Dec. 7, 2011
New Year's Greetings — Part 154100March 21, 2016
Kaskade-S/T — Part 2531078March 4, 2011
Polyhomophonic Substitution — Part 153100March 22, 2020
Unconcealed RSA messages521079Nov. 2, 2011
Monoalphabetic substitution with camouflage — Part 451100Dec. 21, 2011
Strange Message from Thessaloniki51100Dec. 10, 2012
Double Column Transposition — Part 4511084May 19, 2014
Monoalphabetic substitution with camouflage — Part 3501079Dec. 7, 2011
Keyshanc — Part 1501080May 21, 2012
Lunchtime Attack on the Fully Homomorphic Encryption Scheme491078Jan. 14, 2011
Weakened Granit — Part 149100Sept. 24, 2015
New Year's Greetings — Part 249100March 21, 2016
ORYX Stream Cipher Part II481077Oct. 14, 2010
Double Column Transposition — Part 2471084May 2, 2014
New Year's Greetings — Part 347100March 21, 2016
Advent Challenge — Part 3471096Dec. 22, 2017
RSA Factoring Challenge: RSA-220460Feb. 7, 2012
CMEA 1451077Dec. 6, 2010
Advent Challenge — Part 4451096Dec. 21, 2017
New Year's Greetings — Part 444100March 21, 2016
Not-so-Secret Message from Malawi — Part II (ECC)431077Oct. 14, 2010
Music Code — Part 143100May 17, 2011
Homophonic Encryption — Part 1431104May 4, 2019
Ku Klux Klan42VariableOct. 14, 2010
Music Code — Part 2421078May 17, 2011
Pigpen with a twist — Part 2421079Sept. 2, 2011
Pigpen with a twist — Part 3411079Sept. 2, 2011
Keyshanc — Part 2411080May 21, 2012
An 'unhearable' message41100June 5, 2012
Double Column Transposition — Part 3411084May 2, 2014
Lightweight Introduction to Lattices — Part 240100June 23, 2020
RSA Factoring Challenge: RSA-230390Feb. 7, 2012
Fastest in the West381098June 12, 2018
Homophonic Encryption — Part 2381104May 8, 2019
Monoalphabetic Substitution with Nostradamus Flavor371102Feb. 16, 2019
Homophonic Encryption — Part 3371104May 8, 2019
Kaskade-S/T — Part 3361078March 4, 2011
Homophonic Encryption — Part 4361104May 8, 2019
Trendy Messenger351098June 12, 2018
Lightweight Introduction to Lattices — Part 3351113July 16, 2020
Double Column Transposition — Part 1341084April 4, 2014
Lattice Part 1331078March 11, 2011
Monoalphabetic Substitution with Camouflage — Part 5331080March 9, 2012
Spanish Strip Cipher — Part 1331084March 27, 2014
Heartbleed — Part 3330Aug. 28, 2014
Cryptanalysis Hacking Puzzles — Part 133100Oct. 26, 2018
Find the right route — Part 233100Dec. 19, 2020
Spanish Strip Cipher — Part 2321084March 27, 2014
Find the right route — Part 332100Dec. 26, 2020
Typex — Part 1311082Feb. 28, 2013
ORYX Stream Cipher — Part 3 (revised)311082June 6, 2013
M-138 — Part 4311086Dec. 24, 2014
CMEA 22912990Dec. 6, 2010
Polyhomophonic Substitution — Part 2291110March 28, 2020
AES ECB Wrong Encoding281096Dec. 16, 2017
The LoRa Cipher: Logic Randomness — Part 1281110Feb. 19, 2020
RSA Factoring Challenge: RSA-232270Feb. 7, 2012
RSA Factoring Challenge: RSA-240270Feb. 7, 2012
RSA Factoring Challenge: RSA-250260Feb. 7, 2012
Handycipher made in love — Part 1261102Feb. 16, 2019
Typex — Part 2251082April 3, 2013
Polyphonic Substitution Cipher — Part 1251108Nov. 21, 2019
RSA with Special d2412986Oct. 14, 2010
The Syllabary Cipher – Part 2241161Oct. 28, 2022
Polyphonic Substitution Cipher — Part 2231109Jan. 14, 2020
Purple 1211077Oct. 27, 2010
A Cloaked Substitution Cipher — Part 1211106Aug. 21, 2019
Breaking a Filter Generator201100Sept. 25, 2018
Handycipher made in love — Part 2201104May 21, 2019
The T52 Sturgeon Challenge — Part 1201105July 13, 2019
A Cloaked Substitution Cipher — Part 2201106Aug. 25, 2019
Cascading Encryption — Part 2/3191082March 25, 2013
Flawed Usage of a OTP Cipher by the BND191088Aug. 23, 2015
ASAC — A Strong(er) ADFGVX Cipher — Part 1191090July 9, 2016
The T52 Sturgeon Challenge — Part 2191105July 22, 2019
The Syllabary Cipher – Part 3191161Oct. 28, 2022
Sigaba Part 1181077Oct. 14, 2010
Polyhomophonic Substitution — Part 3181111April 6, 2020
The SZ42 Challenge — Part 1181113July 22, 2020
The SZ42 Challenge — Part 2181114Aug. 5, 2020
The Hutton Cipher – Part 1181206May 2, 2023
Cipher ID — Part 1171107Nov. 19, 2019
Concealed Messages — Vigenère's Night Sky160May 1, 2012
New Year's Greetings — Part 5161089March 21, 2016
The SZ42 Challenge — Part 3161114Aug. 15, 2020
The SZ42 Challenge — Part 4161114Aug. 29, 2020
The SZ42 Challenge — Part 5161115Sept. 3, 2020
Weakened Handycipher — Part 1151087May 13, 2015
The T52 Sturgeon Challenge — Part 3151105July 22, 2019
Merkle-Hellman Knapsack Challenge — Part 2151160Oct. 14, 2022
The Hutton Cipher – Part 2151222June 5, 2023
Weakened Handycipher — Part 3141087May 13, 2015
The SZ42 Challenge — Part 6141115Oct. 2, 2020
The SZ42 Challenge — Part 8141116Oct. 31, 2020
Wheatstone Cryptograph — Part 2141123May 21, 2021
Weakened Handycipher — Part 2131087May 13, 2015
The T52 Sturgeon Challenge — Part 4131105July 22, 2019
The SZ42 Challenge — Part 7131116Oct. 27, 2020
The SZ42 Challenge — Part 9131118Dec. 19, 2020
The Syllabary Cipher – Part 4131161Oct. 28, 2022
The Syllabary Cipher – Part 5131161Oct. 28, 2022
The Josse Challenge – Part 1131180Feb. 10, 2023
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2121078April 13, 2011
Cascading Encryption — Part 3/3121082March 29, 2013
ORYX Stream Cipher — Part 4a121084April 14, 2014
The Josse Challenge – Part 2121184Feb. 25, 2023
Hill Cipher111155Sept. 4, 2022
The Josse Challenge – Part 3111192March 27, 2023
Akelarre Part 1101077Nov. 24, 2010
Kaskade-S/T — Part 5101078May 5, 2011
The T52 Sturgeon Challenge — Part 8101105Aug. 10, 2019
The SIGABA Challenge — Part 1101110Feb. 29, 2020
Modified Vigenère Cipher101136Jan. 24, 2022
Double Column Transposition — Part 591085June 23, 2014
Hilly — Part 191092Jan. 25, 2017
The T52 Sturgeon Challenge — Part 1191105Aug. 10, 2019
The T52 Sturgeon Challenge — Part 1291105Aug. 10, 2019
The SIGABA Challenge — Part 291110March 5, 2020
The SZ42 Challenge — Part 1291130Oct. 6, 2021
Alberti Challenge — Part 291144May 14, 2022
"The Road" — Part 181101Dec. 8, 2018
The T52 Sturgeon Challenge — Part 981105Aug. 10, 2019
The T52 Sturgeon Challenge — Part 1081105Aug. 10, 2019
The SZ42 Challenge — Part 1381130Oct. 6, 2021
Handycipher — Part 271086March 3, 2015
Spirale — Part 171088Aug. 23, 2015
Spirale — Part 271088Aug. 23, 2015
Holographic Encryption — Part 171093April 7, 2017
The T52 Sturgeon Challenge — Part 571105Aug. 10, 2019
The T52 Sturgeon Challenge — Part 671105Aug. 10, 2019
The T52 Sturgeon Challenge — Part 771105Aug. 10, 2019
The Heavy T52 Sturgeon Challenge — Part 7713561April 23, 2020
Handycipher — Part 3613151March 3, 2015
Kaskade-S/T — Part 6 (RansomKaskade Part 1)61094July 2, 2017
Weakened ElsieFour — Part 161098April 28, 2018
The SIGABA Challenge — Part 3613545March 11, 2020
The Heavy T52 Sturgeon Challenge — Part 4613558April 15, 2020
The Heavy T52 Sturgeon Challenge — Part 5613560April 21, 2020
Sigaba Part 2512986Oct. 14, 2010
Handycipher — Part 151086March 3, 2015
Spirale — Part 351088Aug. 23, 2015
Handycipher — Part 5513222June 28, 2016
Handycipher — Part 6513222June 28, 2016
Weakened Handycipher — Part 451090June 28, 2016
Weakened Handycipher — Part 551090June 28, 2016
Weakened Handycipher — Part 651090June 28, 2016
The SIGABA Challenge — Part 4513547March 17, 2020
The Heavy T52 Sturgeon Challenge — Part 6513561April 22, 2020
The SZ42 Challenge — Part 1051119Jan. 30, 2021
Notes of an Italian Soldier40Oct. 14, 2010
Handycipher — Part 4413222June 28, 2016
ElsieFour — Part 1413305Oct. 3, 2017
Weakened ElsieFour — Part 341095Oct. 3, 2017
Christmas Challenge 2019: Differential Cryptanalysis — Part 141108Dec. 22, 2019
Differential Cryptanalysis — Part 241109Jan. 28, 2020
The SZ42 Challenge — Part 1141119Jan. 30, 2021
The Hutton Cipher – Part 341260July 21, 2023
The Hutton Cipher – Part 441378Sept. 6, 2023
Extended Handycipher — Part 131087March 27, 2015
Extended Handycipher — Part 231087March 27, 2015
Extended Handycipher — Part 331087March 27, 2015
Extended Handycipher — Part 4313222June 28, 2016
Extended Handycipher — Part 5313222June 28, 2016
Handycipher — Part 8313257Jan. 21, 2017
Handycipher — Part 9313257Jan. 21, 2017
Holographic Encryption — Part 231093April 7, 2017
The Vatican Challenge — Part 130Feb. 14, 2018
The Vatican Challenge — Part 230Feb. 14, 2018
The Heavy T52 Sturgeon Challenge — Part 9313564April 30, 2020
Double Column Transposition20Oct. 14, 2010
Unknown Author2VariableOct. 14, 2010
ORYX Stream Cipher — Part 4b213111April 14, 2014
Extended Handycipher — Part 6213222June 28, 2016
Handycipher — Part 7213257Jan. 21, 2017
Catherine of Aragon's Letter to King Ferdinand, her Father (1509)2VariableNov. 28, 2018
"The Road" — Part 221101Dec. 8, 2018
The Heavy T52 Sturgeon Challenge — Part 1213489Sept. 30, 2019
The Heavy T52 Sturgeon Challenge — Part 2213491Oct. 9, 2019
The Heavy T52 Sturgeon Challenge — Part 3213497Oct. 26, 2019
The SIGABA Challenge — Part 5213550March 26, 2020
SIGABA CSP-889 — Part 121124June 1, 2021
SIGABA CSP-889 — Part 221124June 1, 2021
SIGABA CSP-889 — Part 3213755June 1, 2021
SIGABA CSP-2900 — Part 121126July 31, 2021
SIGABA CSP-2900 — Part 221126July 31, 2021
SIGABA CSP-2900 — Part 3213794July 31, 2021
Beale Ciphers1VariableOct. 14, 2010
Substitution Cipher with Non-Prefix Codes113006June 15, 2011
Monoalphabetic Substitution with Camouflage — Part 611080June 30, 2012
ASAC — A Strong(er) ADFGVX Cipher — Part 211090July 9, 2016
Hilly — Part 211095Oct. 17, 2017
Weakened ElsieFour — Part 211098April 28, 2018
Handycipher — Part 1011105June 25, 2019
The Vatican Challenge — Part 41VariableJuly 7, 2019
The SIGABA Challenge — Part 6113554April 5, 2020
D'Agapeyeff0VariableOct. 14, 2010
Dorabella0VariableOct. 14, 2010
Kryptos0VariableOct. 14, 2010
World Record Challenge: Break 65 Bits of AES012986Oct. 14, 2010
Recovering the Private Key in the Fully Homomorphic Encryption Scheme012993Jan. 14, 2011
Twelve-Year-Old Murder Case0VariableApril 7, 2011
Kaskade-S/T — Part 401078May 5, 2011
Digital Signatures: DSA with Medium Fields013013Sept. 2, 2011
The third ENIGMA M4 message0VariableSept. 21, 2011
RSA Factoring Challenge: RSA-260013028Feb. 7, 2012
RSA Factoring Challenge: RSA-270013028Feb. 7, 2012
RSA Factoring Challenge: RSA-896013028Feb. 7, 2012
RSA Factoring Challenge: RSA-280013028Feb. 7, 2012
RSA Factoring Challenge: RSA-290013028Feb. 7, 2012
RSA Factoring Challenge: RSA-300013028Feb. 7, 2012
RSA Factoring Challenge: RSA-309013028Feb. 7, 2012
RSA Factoring Challenge: RSA-1024013028Feb. 7, 2012
RSA Factoring Challenge: RSA-310013028Feb. 7, 2012
RSA Factoring Challenge: RSA-320013028Feb. 7, 2012
RSA Factoring Challenge: RSA-330013028Feb. 7, 2012
RSA Factoring Challenge: RSA-340013028Feb. 7, 2012
RSA Factoring Challenge: RSA-350013028Feb. 7, 2012
RSA Factoring Challenge: RSA-360013028Feb. 7, 2012
RSA Factoring Challenge: RSA-370013028Feb. 7, 2012
RSA Factoring Challenge: RSA-380013028Feb. 7, 2012
RSA Factoring Challenge: RSA-390013028Feb. 7, 2012
RSA Factoring Challenge: RSA-400013028Feb. 7, 2012
RSA Factoring Challenge: RSA-410013028Feb. 7, 2012
RSA Factoring Challenge: RSA-420013028Feb. 7, 2012
RSA Factoring Challenge: RSA-430013028Feb. 7, 2012
RSA Factoring Challenge: RSA-440013028Feb. 7, 2012
RSA Factoring Challenge: RSA-450013028Feb. 7, 2012
RSA Factoring Challenge: RSA-460013028Feb. 7, 2012
RSA Factoring Challenge: RSA-1536013028Feb. 7, 2012
RSA Factoring Challenge: RSA-470013028Feb. 7, 2012
RSA Factoring Challenge: RSA-480013028Feb. 7, 2012
RSA Factoring Challenge: RSA-490013028Feb. 7, 2012
RSA Factoring Challenge: RSA-500013028Feb. 7, 2012
RSA Factoring Challenge: RSA-617013028Feb. 7, 2012
RSA Factoring Challenge: RSA-2048013028Feb. 7, 2012
ORYX Stream Cipher — Part 4d013078June 27, 2013
Double Column Transposition Reloaded — Part 1013097Dec. 11, 2013
Double Column Transposition Reloaded — Part 2013097Dec. 11, 2013
Double Column Transposition Reloaded — Part 3013097Dec. 11, 2013
Spanish Strip Cipher — Part 30VariableMarch 27, 2014
ORYX Stream Cipher — Part 4c013111April 14, 2014
Double-Column Transposition/Granit — Part 101087July 1, 2015
Double-Column Transposition/Granit — Part 201087July 1, 2015
Double-Column Transposition/Granit — Part 301087July 1, 2015
Spirale — Part 4013175Aug. 23, 2015
Weakened Granit — Part 201088Sept. 24, 2015
Weakened Granit — Part 301088Sept. 24, 2015
ASAC — A Strong(er) ADFGVX Cipher — Part 301090July 9, 2016
ASAC — A Strong(er) ADFGVX Cipher — Part 401090July 9, 2016
ASAC — A Strong(er) ADFGVX Cipher — Part 501090July 9, 2016
"The Road" — Part 301101Dec. 8, 2018
The Vatican Challenge — Part 30VariableJune 25, 2019
The Vatican Challenge — Part 50VariableJuly 7, 2019
The Heavy T52 Sturgeon Challenge — Part 8013562April 24, 2020
A Heavy SZ42 Challenge – Part 14014408Dec. 30, 2022

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