All Challenges (Compact)

355 published challenges (in level I, II, III and X), sorted by:
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LevelNameNumber of
Solvers
Available
Points
Published on
Number Sequence4298100Oct. 14, 2010
Original Caesar Cipher3015100Dec. 15, 2010
Number Sequence — Part 22110100July 11, 2011
Caesar Encryption1440100Oct. 21, 2010
Beaver Code1186100Aug. 13, 2012
Letter to the Templars — Part 11021100July 16, 2012
Number Sequence — Part 31012100March 30, 2012
Number Sequence — Part 4839100April 18, 2012
A hidden word834100Jan. 6, 2013
Letter to the Templars — Part 2819100July 30, 2012
Letter to the Templars — Part 37051082Oct. 9, 2012
Affine Codes / Modulo Arithmetic with N / Extended Euclid590100Sept. 9, 2011
Monoalphabetic Substitution545100Oct. 14, 2010
Cracking SHA1-Hashed Passwords5451079April 4, 2011
Factorization Cipher — Part 1498100Oct. 17, 2011
Grille Cipher486100Oct. 14, 2011
Advent-Challenge — Part 1463100Dec. 8, 2017
Number Sequence — Part 8394100Sept. 14, 2015
A modified homophonic cipher with reduced alphabets — Part 1391100Oct. 21, 2010
A modified homophonic cipher with reduced alphabets — Part 2338100Oct. 21, 2010
One-Time Pad with Flaws308100Nov. 12, 2010
Alice's Birthday Party (Part 1)3011078Oct. 14, 2010
Snow White and the seven dwarfs291100April 20, 2013
Alice's Birthday Party (Part 2)2891078Oct. 14, 2010
From Russia with Love282100Sept. 4, 2013
Broadcasting and low exponent — RSA Attack2341080July 22, 2011
Modified Caesar Cipher226100Sept. 2, 2011
How do you become a big cryptographer?224100May 28, 2012
M-138 — Part 1214100Dec. 24, 2014
Not-so-Secret Message from Malawi — Part I (RSA)2021078Oct. 14, 2010
Brute-Force-Attack on Triple-DES with Reduced Key Space1981078Oct. 14, 2010
Reserve Hand Procedure — Part 1190100March 6, 2013
Cryptanalysis Hacking Puzzles — Part 2186100Jan. 9, 2019
Classical Ciphers^3183100Oct. 14, 2010
Letter from the Alleged Countess Julie von Ortenburg176100Oct. 14, 2010
Enigma Messages with Repeated Letters — Part 1175100Sept. 26, 2013
Hybrid Encryption I1741078Nov. 2, 2010
Nils away on travel171100Aug. 8, 2013
Autokey Cipher168100Sept. 25, 2018
¿No Hablas Español? No problemo!162100April 18, 2012
Number Sequence — Part 6158100March 23, 2015
RSA: Two different keys — same ciphertext1551080Aug. 15, 2011
Molehunt (Part 1/3)154100Oct. 23, 2010
Pigpen with a twist — Part 1153100Sept. 5, 2011
The Book Code: A Challenge for Bookworms149100March 21, 2012
Image Noise148100Nov. 20, 2015
Factorization Cipher — Part 21471080Dec. 1, 2011
Molehunt (Part 2/3)146100Oct. 23, 2010
M-138 — Part 21351088Dec. 24, 2014
Enigma Part 11291078Oct. 14, 2010
A Secret Message from Castle Mansfeld128100Oct. 14, 2010
Trifid Cipher125100Oct. 28, 2013
ADFGVX — Part 2121100Aug. 15, 2011
Playfair Encryption118100Dec. 22, 2010
A really long number sequence1171080Sept. 5, 2011
Number Sequence — Part 9116100Nov. 16, 2017
ADFGVX — Part 1115100Aug. 15, 2011
Double Columnar Transposition115100Oct. 12, 2011
Number Sequence — Part 10114100April 18, 2018
Playfair with hints about the grid112100Jan. 16, 2013
A hidden word — Part 2109100April 16, 2015
Hill Cipher with Sudoku Key104100Sept. 4, 2013
Kaskade-S/T — Part 1103100March 4, 2011
Enigma Combinatorics101100Nov. 12, 2010
Zodiac Cipher100100Oct. 14, 2010
Alberti Challenge — Part 1100100March 26, 2022
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 197100April 7, 2011
ECDH-Key Exchange for Beginners97100Feb. 24, 2012
The Last Note97100Sept. 22, 2014
Number Sequence — Part 596100April 18, 2012
Factorization Cipher — Part 3941081Jan. 6, 2012
Wheatstone Cryptograph — Part 192100April 21, 2021
Number Sequence — Part 791100March 23, 2015
Heartbleed — Part 1900Aug. 28, 2014
Enigma Part 2881078Oct. 14, 2010
Partial Key Exposure with RSA — Part 1851081Feb. 11, 2012
Enigma Messages with Repeated Letters — Part 282100Oct. 28, 2013
Enigma Messages with Repeated Letters — Part 382100March 5, 2014
Molehunt (Part 3/3)811078Oct. 23, 2010
ORYX Stream Cipher Part I801078Oct. 14, 2010
Find the right route — Part 180100Oct. 27, 2020
AES key — encoded in the machine readable zone of a European ePassport781081Jan. 16, 2012
Enigma Messages77100Jan. 23, 2013
Multilingual Monoalphabetic Substitution77100Jan. 30, 2013
Enigma Messages with Repeated Letters — Part 577100March 5, 2014
Modular Sequences75100Sept. 25, 2018
Smartcard RSA741078Oct. 25, 2010
Enigma Messages with Repeated Letters — Part 473100March 5, 2014
BCR code (Book-Caesar-RSA)721082Sept. 12, 2012
Turing Bombe Enigma I70100Oct. 17, 2011
Cascading Encryption — Part 1/370100Jan. 25, 2013
Recycled One-Time Pad67100Nov. 20, 2012
The Syllabary Cipher – Part 167101Oct. 28, 2022
Unusual encryption using a diophantine equation651080Sept. 2, 2011
Monoalphabetic substitution with camouflage — Part 164100Oct. 27, 2011
RSA Factoring Challenge: RSA-704630July 31, 2013
M-138 — Part 3621088Dec. 24, 2014
The Einstein Enigma611100Feb. 7, 2018
Heartbleed — Part 2600Aug. 28, 2014
RSA Factoring Challenge: RSA-210590Feb. 7, 2012
An Invisible Message58100Oct. 17, 2011
News from Castle Mansfeld57100Nov. 13, 2015
Summer Job561102June 12, 2018
New Year's Greetings — Part 153100March 21, 2016
Lightweight Introduction to Lattices — Part 153100May 16, 2020
Kaskade-S/T — Part 2521079March 4, 2011
Monoalphabetic substitution with camouflage — Part 2521080Dec. 7, 2011
Double Column Transposition — Part 4511086May 19, 2014
Unconcealed RSA messages501080Nov. 2, 2011
Lunchtime Attack on the Fully Homomorphic Encryption Scheme491079Jan. 14, 2011
Strange Message from Thessaloniki49100Dec. 10, 2012
New Year's Greetings — Part 249100March 21, 2016
Advent-Challenge — Part 2491099Dec. 16, 2017
Polyhomophonic Substitution — Part 149100March 22, 2020
ORYX Stream Cipher Part II481078Oct. 14, 2010
Monoalphabetic substitution with camouflage — Part 448100Dec. 21, 2011
Monoalphabetic substitution with camouflage — Part 3471080Dec. 7, 2011
Keyshanc — Part 1471081May 21, 2012
Weakened Granit — Part 147100Sept. 24, 2015
New Year's Greetings — Part 347100March 21, 2016
Double Column Transposition — Part 2451086May 2, 2014
RSA Factoring Challenge: RSA-220440Feb. 7, 2012
New Year's Greetings — Part 444100March 21, 2016
Not-so-Secret Message from Malawi — Part II (ECC)431078Oct. 14, 2010
CMEA 1431079Dec. 6, 2010
Advent Challenge — Part 3431099Dec. 22, 2017
Music Code — Part 142100May 17, 2011
Ku Klux Klan41VariableOct. 14, 2010
Music Code — Part 2411079May 17, 2011
An 'unhearable' message41100June 5, 2012
Advent Challenge — Part 4411099Dec. 21, 2017
Pigpen with a twist — Part 2401080Sept. 2, 2011
Pigpen with a twist — Part 3401080Sept. 2, 2011
Double Column Transposition — Part 3401086May 2, 2014
Homophonic Encryption — Part 1401108May 4, 2019
Keyshanc — Part 2381081May 21, 2012
RSA Factoring Challenge: RSA-230370Feb. 7, 2012
Lightweight Introduction to Lattices — Part 236100June 23, 2020
Kaskade-S/T — Part 3351079March 4, 2011
Homophonic Encryption — Part 2351108May 8, 2019
Homophonic Encryption — Part 3351108May 8, 2019
Merkle-Hellman Knapsack Challenge - Part 135101Oct. 14, 2022
Fastest in the West341102June 12, 2018
Trendy Messenger341102June 12, 2018
Homophonic Encryption — Part 4341108May 8, 2019
Lattice Part 1331079March 11, 2011
Heartbleed — Part 3330Aug. 28, 2014
Monoalphabetic Substitution with Nostradamus Flavor331107Feb. 16, 2019
Lightweight Introduction to Lattices — Part 3331120July 16, 2020
Spanish Strip Cipher — Part 1321086March 27, 2014
Double Column Transposition — Part 1321086April 4, 2014
ORYX Stream Cipher — Part 3 (revised)311084June 6, 2013
Spanish Strip Cipher — Part 2311086March 27, 2014
M-138 — Part 4311088Dec. 24, 2014
Monoalphabetic Substitution with Camouflage — Part 5301081March 9, 2012
Cryptanalysis Hacking Puzzles — Part 130100Oct. 26, 2018
Find the right route — Part 229100Dec. 19, 2020
CMEA 22813010Dec. 6, 2010
Typex — Part 1281083Feb. 28, 2013
Polyhomophonic Substitution — Part 2271117March 28, 2020
Find the right route — Part 327100Dec. 26, 2020
AES ECB Wrong Encoding251099Dec. 16, 2017
Handycipher made in love — Part 1251107Feb. 16, 2019
RSA with Special d2413005Oct. 14, 2010
RSA Factoring Challenge: RSA-232240Feb. 7, 2012
RSA Factoring Challenge: RSA-240240Feb. 7, 2012
Typex — Part 2241083April 3, 2013
The LoRa Cipher: Logic Randomness — Part 1241116Feb. 19, 2020
RSA Factoring Challenge: RSA-250230Feb. 7, 2012
Polyphonic Substitution Cipher — Part 1221113Nov. 21, 2019
Purple 1201078Oct. 27, 2010
Polyphonic Substitution Cipher — Part 2201115Jan. 14, 2020
The Syllabary Cipher – Part 2201230Oct. 28, 2022
ASAC — A Strong(er) ADFGVX Cipher — Part 1191093July 9, 2016
Breaking a Filter Generator191104Sept. 25, 2018
Handycipher made in love — Part 2191109May 21, 2019
The T52 Sturgeon Challenge — Part 1191110July 13, 2019
The T52 Sturgeon Challenge — Part 2181110July 22, 2019
A Cloaked Substitution Cipher — Part 1181111Aug. 21, 2019
Polyhomophonic Substitution — Part 3181117April 6, 2020
Sigaba Part 1171078Oct. 14, 2010
Cascading Encryption — Part 2/3171083March 25, 2013
Flawed Usage of a OTP Cipher by the BND171090Aug. 23, 2015
A Cloaked Substitution Cipher — Part 2171111Aug. 25, 2019
Cipher ID — Part 1171113Nov. 19, 2019
The SZ42 Challenge — Part 1171121July 22, 2020
The SZ42 Challenge — Part 2171121Aug. 5, 2020
Concealed Messages — Vigenère's Night Sky160May 1, 2012
New Year's Greetings — Part 5161092March 21, 2016
The SZ42 Challenge — Part 4161122Aug. 29, 2020
The Syllabary Cipher – Part 3161230Oct. 28, 2022
Weakened Handycipher — Part 1151089May 13, 2015
The SZ42 Challenge — Part 3151122Aug. 15, 2020
The SZ42 Challenge — Part 5151122Sept. 3, 2020
Weakened Handycipher — Part 3141089May 13, 2015
The T52 Sturgeon Challenge — Part 3141110July 22, 2019
Weakened Handycipher — Part 2131089May 13, 2015
The SZ42 Challenge — Part 6131123Oct. 2, 2020
The SZ42 Challenge — Part 8131125Oct. 31, 2020
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2121079April 13, 2011
Cascading Encryption — Part 3/3121083March 29, 2013
ORYX Stream Cipher — Part 4a121086April 14, 2014
The T52 Sturgeon Challenge — Part 4121110July 22, 2019
The SZ42 Challenge — Part 7121124Oct. 27, 2020
The SZ42 Challenge — Part 9121127Dec. 19, 2020
Wheatstone Cryptograph — Part 2121135May 21, 2021
Merkle-Hellman Knapsack Challenge — Part 2121221Oct. 14, 2022
Akelarre Part 1101078Nov. 24, 2010
Kaskade-S/T — Part 5101079May 5, 2011
The SIGABA Challenge — Part 1101116Feb. 29, 2020
Modified Vigenère Cipher101156Jan. 24, 2022
Hill Cipher101202Sept. 4, 2022
The Syllabary Cipher – Part 4101230Oct. 28, 2022
The Syllabary Cipher – Part 5101230Oct. 28, 2022
Double Column Transposition — Part 591086June 23, 2014
Hilly — Part 191095Jan. 25, 2017
The T52 Sturgeon Challenge — Part 891110Aug. 10, 2019
The SIGABA Challenge — Part 291116March 5, 2020
The SZ42 Challenge — Part 1291145Oct. 6, 2021
The T52 Sturgeon Challenge — Part 1181110Aug. 10, 2019
The T52 Sturgeon Challenge — Part 1281110Aug. 10, 2019
The SZ42 Challenge — Part 1381145Oct. 6, 2021
Alberti Challenge — Part 281172May 14, 2022
Handycipher — Part 271088March 3, 2015
Holographic Encryption — Part 171096April 7, 2017
"The Road" — Part 171105Dec. 8, 2018
The T52 Sturgeon Challenge — Part 971110Aug. 10, 2019
The T52 Sturgeon Challenge — Part 1071110Aug. 10, 2019
Handycipher — Part 3613184March 3, 2015
Kaskade-S/T — Part 6 (RansomKaskade Part 1)61097July 2, 2017
Weakened ElsieFour — Part 161101April 28, 2018
The T52 Sturgeon Challenge — Part 561110Aug. 10, 2019
The T52 Sturgeon Challenge — Part 661110Aug. 10, 2019
The T52 Sturgeon Challenge — Part 761110Aug. 10, 2019
The SIGABA Challenge — Part 3613642March 11, 2020
Sigaba Part 2513005Oct. 14, 2010
Handycipher — Part 151088March 3, 2015
Spirale — Part 151090Aug. 23, 2015
Spirale — Part 251090Aug. 23, 2015
Handycipher — Part 5513261June 28, 2016
Handycipher — Part 6513261June 28, 2016
Weakened Handycipher — Part 451093June 28, 2016
Weakened Handycipher — Part 551093June 28, 2016
Weakened Handycipher — Part 651093June 28, 2016
The SIGABA Challenge — Part 4513645March 17, 2020
The Heavy T52 Sturgeon Challenge — Part 7513662April 23, 2020
The SZ42 Challenge — Part 1051129Jan. 30, 2021
Notes of an Italian Soldier40Oct. 14, 2010
Spirale — Part 341090Aug. 23, 2015
Handycipher — Part 4413261June 28, 2016
ElsieFour — Part 1413355Oct. 3, 2017
Weakened ElsieFour — Part 341098Oct. 3, 2017
The Heavy T52 Sturgeon Challenge — Part 4413658April 15, 2020
The Heavy T52 Sturgeon Challenge — Part 5413661April 21, 2020
The SZ42 Challenge — Part 1141129Jan. 30, 2021
Extended Handycipher — Part 131088March 27, 2015
Extended Handycipher — Part 231088March 27, 2015
Extended Handycipher — Part 331088March 27, 2015
Extended Handycipher — Part 4313261June 28, 2016
Extended Handycipher — Part 5313261June 28, 2016
Handycipher — Part 8313300Jan. 21, 2017
Handycipher — Part 9313300Jan. 21, 2017
Holographic Encryption — Part 231096April 7, 2017
The Vatican Challenge — Part 130Feb. 14, 2018
The Vatican Challenge — Part 230Feb. 14, 2018
Christmas Challenge 2019: Differential Cryptanalysis — Part 131114Dec. 22, 2019
Differential Cryptanalysis — Part 231115Jan. 28, 2020
Double Column Transposition20Oct. 14, 2010
Unknown Author2VariableOct. 14, 2010
ORYX Stream Cipher — Part 4b213140April 14, 2014
Extended Handycipher — Part 6213261June 28, 2016
Handycipher — Part 7213300Jan. 21, 2017
Catherine of Aragon's Letter to King Ferdinand, her Father (1509)2VariableNov. 28, 2018
The Heavy T52 Sturgeon Challenge — Part 2213575Oct. 9, 2019
The Heavy T52 Sturgeon Challenge — Part 3213582Oct. 26, 2019
The SIGABA Challenge — Part 5213649March 26, 2020
The Heavy T52 Sturgeon Challenge — Part 6213662April 22, 2020
The Heavy T52 Sturgeon Challenge — Part 9213666April 30, 2020
SIGABA CSP-889 — Part 121136June 1, 2021
SIGABA CSP-889 — Part 221136June 1, 2021
SIGABA CSP-889 — Part 3213926June 1, 2021
SIGABA CSP-2900 — Part 121140July 31, 2021
SIGABA CSP-2900 — Part 221140July 31, 2021
SIGABA CSP-2900 — Part 3213982July 31, 2021
Beale Ciphers1VariableOct. 14, 2010
Substitution Cipher with Non-Prefix Codes113027June 15, 2011
Monoalphabetic Substitution with Camouflage — Part 611082June 30, 2012
ASAC — A Strong(er) ADFGVX Cipher — Part 211093July 9, 2016
Hilly — Part 211098Oct. 17, 2017
Weakened ElsieFour — Part 211101April 28, 2018
"The Road" — Part 211105Dec. 8, 2018
Handycipher — Part 1011109June 25, 2019
The Vatican Challenge — Part 41VariableJuly 7, 2019
The Heavy T52 Sturgeon Challenge — Part 1113572Sept. 30, 2019
The SIGABA Challenge — Part 6113653April 5, 2020
D'Agapeyeff0VariableOct. 14, 2010
Dorabella0VariableOct. 14, 2010
Kryptos0VariableOct. 14, 2010
World Record Challenge: Break 65 Bits of AES013005Oct. 14, 2010
Recovering the Private Key in the Fully Homomorphic Encryption Scheme013013Jan. 14, 2011
Twelve-Year-Old Murder Case0VariableApril 7, 2011
Kaskade-S/T — Part 401079May 5, 2011
Digital Signatures: DSA with Medium Fields013035Sept. 2, 2011
The third ENIGMA M4 message0VariableSept. 21, 2011
RSA Factoring Challenge: RSA-260013050Feb. 7, 2012
RSA Factoring Challenge: RSA-270013050Feb. 7, 2012
RSA Factoring Challenge: RSA-896013050Feb. 7, 2012
RSA Factoring Challenge: RSA-280013050Feb. 7, 2012
RSA Factoring Challenge: RSA-290013050Feb. 7, 2012
RSA Factoring Challenge: RSA-300013050Feb. 7, 2012
RSA Factoring Challenge: RSA-309013050Feb. 7, 2012
RSA Factoring Challenge: RSA-1024013050Feb. 7, 2012
RSA Factoring Challenge: RSA-310013050Feb. 7, 2012
RSA Factoring Challenge: RSA-320013050Feb. 7, 2012
RSA Factoring Challenge: RSA-330013050Feb. 7, 2012
RSA Factoring Challenge: RSA-340013050Feb. 7, 2012
RSA Factoring Challenge: RSA-350013050Feb. 7, 2012
RSA Factoring Challenge: RSA-360013050Feb. 7, 2012
RSA Factoring Challenge: RSA-370013050Feb. 7, 2012
RSA Factoring Challenge: RSA-380013050Feb. 7, 2012
RSA Factoring Challenge: RSA-390013050Feb. 7, 2012
RSA Factoring Challenge: RSA-400013050Feb. 7, 2012
RSA Factoring Challenge: RSA-410013050Feb. 7, 2012
RSA Factoring Challenge: RSA-420013050Feb. 7, 2012
RSA Factoring Challenge: RSA-430013050Feb. 7, 2012
RSA Factoring Challenge: RSA-440013050Feb. 7, 2012
RSA Factoring Challenge: RSA-450013050Feb. 7, 2012
RSA Factoring Challenge: RSA-460013050Feb. 7, 2012
RSA Factoring Challenge: RSA-1536013050Feb. 7, 2012
RSA Factoring Challenge: RSA-470013050Feb. 7, 2012
RSA Factoring Challenge: RSA-480013050Feb. 7, 2012
RSA Factoring Challenge: RSA-490013050Feb. 7, 2012
RSA Factoring Challenge: RSA-500013050Feb. 7, 2012
RSA Factoring Challenge: RSA-617013050Feb. 7, 2012
RSA Factoring Challenge: RSA-2048013050Feb. 7, 2012
ORYX Stream Cipher — Part 4d013104June 27, 2013
Double Column Transposition Reloaded — Part 1013124Dec. 11, 2013
Double Column Transposition Reloaded — Part 2013124Dec. 11, 2013
Double Column Transposition Reloaded — Part 3013124Dec. 11, 2013
Spanish Strip Cipher — Part 30VariableMarch 27, 2014
ORYX Stream Cipher — Part 4c013140April 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 4013209Aug. 23, 2015
Weakened Granit — Part 201090Sept. 24, 2015
Weakened Granit — Part 301090Sept. 24, 2015
ASAC — A Strong(er) ADFGVX Cipher — Part 301093July 9, 2016
ASAC — A Strong(er) ADFGVX Cipher — Part 401093July 9, 2016
ASAC — A Strong(er) ADFGVX Cipher — Part 501093July 9, 2016
"The Road" — Part 301105Dec. 8, 2018
The Vatican Challenge — Part 30VariableJune 25, 2019
The Vatican Challenge — Part 50VariableJuly 7, 2019
The Heavy T52 Sturgeon Challenge — Part 8013663April 24, 2020
A Heavy SZ42 Challenge – Part 14015911Dec. 30, 2022

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