All Challenges (Compact)

359 published challenges (in level I, II, III and X), sorted by:
Show challenges:
LevelNameNumber of
Solvers
Available
Points
Published on
Number Sequence4324100Oct. 14, 2010
Original Caesar Cipher3039100Dec. 15, 2010
Number Sequence — Part 22124100July 11, 2011
Caesar Encryption1454100Oct. 21, 2010
Beaver Code1199100Aug. 13, 2012
Letter to the Templars — Part 11032100July 16, 2012
Number Sequence — Part 31022100March 30, 2012
Number Sequence — Part 4845100April 18, 2012
A hidden word843100Jan. 6, 2013
Letter to the Templars — Part 2828100July 30, 2012
Letter to the Templars — Part 37101081Oct. 9, 2012
Affine Codes / Modulo Arithmetic with N / Extended Euclid595100Sept. 9, 2011
Cracking SHA1-Hashed Passwords5621079April 4, 2011
Monoalphabetic Substitution551100Oct. 14, 2010
Factorization Cipher — Part 1500100Oct. 17, 2011
Grille Cipher490100Oct. 14, 2011
Advent-Challenge — Part 1476100Dec. 8, 2017
Number Sequence — Part 8397100Sept. 14, 2015
A modified homophonic cipher with reduced alphabets — Part 1394100Oct. 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)3041078Oct. 14, 2010
Snow White and the seven dwarfs293100April 20, 2013
Alice's Birthday Party (Part 2)2921078Oct. 14, 2010
From Russia with Love287100Sept. 4, 2013
Broadcasting and low exponent — RSA Attack2371079July 22, 2011
Modified Caesar Cipher228100Sept. 2, 2011
How do you become a big cryptographer?227100May 28, 2012
M-138 — Part 1219100Dec. 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
Cryptanalysis Hacking Puzzles — Part 2196100Jan. 9, 2019
Reserve Hand Procedure — Part 1194100March 6, 2013
Classical Ciphers^3186100Oct. 14, 2010
Letter from the Alleged Countess Julie von Ortenburg180100Oct. 14, 2010
Enigma Messages with Repeated Letters — Part 1178100Sept. 26, 2013
Hybrid Encryption I1761078Nov. 2, 2010
Nils away on travel174100Aug. 8, 2013
Autokey Cipher173100Sept. 25, 2018
¿No Hablas Español? No problemo!166100April 18, 2012
Number Sequence — Part 6161100March 23, 2015
Molehunt (Part 1/3)158100Oct. 23, 2010
RSA: Two different keys — same ciphertext1571079Aug. 15, 2011
Pigpen with a twist — Part 1155100Sept. 5, 2011
Image Noise154100Nov. 20, 2015
The Book Code: A Challenge for Bookworms152100March 21, 2012
Molehunt (Part 2/3)149100Oct. 23, 2010
Factorization Cipher — Part 21491080Dec. 1, 2011
M-138 — Part 21371087Dec. 24, 2014
Enigma Part 11311078Oct. 14, 2010
A Secret Message from Castle Mansfeld130100Oct. 14, 2010
Trifid Cipher126100Oct. 28, 2013
Playfair Encryption124100Dec. 22, 2010
The Syllabary Cipher – Part 1124100Oct. 28, 2022
ADFGVX — Part 2123100Aug. 15, 2011
Alberti Challenge — Part 1121100March 26, 2022
A really long number sequence1201079Sept. 5, 2011
ADFGVX — Part 1119100Aug. 15, 2011
Number Sequence — Part 9118100Nov. 16, 2017
Double Columnar Transposition117100Oct. 12, 2011
Playfair with hints about the grid117100Jan. 16, 2013
Number Sequence — Part 10116100April 18, 2018
A hidden word — Part 2112100April 16, 2015
Enigma Combinatorics107100Nov. 12, 2010
Hill Cipher with Sudoku Key106100Sept. 4, 2013
Kaskade-S/T — Part 1105100March 4, 2011
Zodiac Cipher100100Oct. 14, 2010
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 199100April 7, 2011
The Last Note99100Sept. 22, 2014
ECDH-Key Exchange for Beginners98100Feb. 24, 2012
Number Sequence — Part 598100April 18, 2012
Wheatstone Cryptograph — Part 198100April 21, 2021
Factorization Cipher — Part 3961080Jan. 6, 2012
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 185100Oct. 27, 2020
Molehunt (Part 3/3)821078Oct. 23, 2010
ORYX Stream Cipher Part I801078Oct. 14, 2010
Enigma Messages80100Jan. 23, 2013
Enigma Messages with Repeated Letters — Part 580100March 5, 2014
AES key — encoded in the machine readable zone of a European ePassport791080Jan. 16, 2012
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)731081Sept. 12, 2012
Cascading Encryption — Part 1/372100Jan. 25, 2013
Turing Bombe Enigma I71100Oct. 17, 2011
Unusual encryption using a diophantine equation671079Sept. 2, 2011
Recycled One-Time Pad67100Nov. 20, 2012
Monoalphabetic substitution with camouflage — Part 165100Oct. 27, 2011
RSA Factoring Challenge: RSA-704650July 31, 2013
M-138 — Part 3651087Dec. 24, 2014
The Einstein Enigma621098Feb. 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 Job571100June 12, 2018
Lightweight Introduction to Lattices — Part 156100May 16, 2020
Kaskade-S/T — Part 2531078March 4, 2011
Monoalphabetic substitution with camouflage — Part 2531080Dec. 7, 2011
New Year's Greetings — Part 153100March 21, 2016
Advent-Challenge — Part 2531098Dec. 16, 2017
Polyhomophonic Substitution — Part 153100March 22, 2020
Unconcealed RSA messages521080Nov. 2, 2011
Strange Message from Thessaloniki51100Dec. 10, 2012
Double Column Transposition — Part 4511085May 19, 2014
Monoalphabetic substitution with camouflage — Part 450100Dec. 21, 2011
Lunchtime Attack on the Fully Homomorphic Encryption Scheme491078Jan. 14, 2011
Monoalphabetic substitution with camouflage — Part 3491080Dec. 7, 2011
Weakened Granit — Part 149100Sept. 24, 2015
New Year's Greetings — Part 249100March 21, 2016
ORYX Stream Cipher Part II481078Oct. 14, 2010
Keyshanc — Part 1481081May 21, 2012
Merkle-Hellman Knapsack Challenge - Part 148100Oct. 14, 2022
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 3451098Dec. 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
Music Code — Part 143100May 17, 2011
Advent Challenge — Part 4431098Dec. 21, 2017
Ku Klux Klan42VariableOct. 14, 2010
Music Code — Part 2421079May 17, 2011
Homophonic Encryption — Part 1421106May 4, 2019
Pigpen with a twist — Part 2411079Sept. 2, 2011
Pigpen with a twist — Part 3411079Sept. 2, 2011
An 'unhearable' message41100June 5, 2012
Double Column Transposition — Part 3411085May 2, 2014
Lightweight Introduction to Lattices — Part 240100June 23, 2020
Keyshanc — Part 2391081May 21, 2012
RSA Factoring Challenge: RSA-230380Feb. 7, 2012
Fastest in the West381100June 12, 2018
Homophonic Encryption — Part 2371106May 8, 2019
Kaskade-S/T — Part 3361078March 4, 2011
Monoalphabetic Substitution with Nostradamus Flavor361104Feb. 16, 2019
Homophonic Encryption — Part 3361106May 8, 2019
Homophonic Encryption — Part 4351106May 8, 2019
Lightweight Introduction to Lattices — Part 3351117July 16, 2020
Trendy Messenger341100June 12, 2018
Lattice Part 1331078March 11, 2011
Double Column Transposition — Part 1331085April 4, 2014
Heartbleed — Part 3330Aug. 28, 2014
Monoalphabetic Substitution with Camouflage — Part 5321080March 9, 2012
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
Find the right route — Part 231100Dec. 19, 2020
CMEA 22913000Dec. 6, 2010
Typex — Part 1291082Feb. 28, 2013
Polyhomophonic Substitution — Part 2291114March 28, 2020
Find the right route — Part 329100Dec. 26, 2020
AES ECB Wrong Encoding271098Dec. 16, 2017
The LoRa Cipher: Logic Randomness — Part 1271113Feb. 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 2251082April 3, 2013
Handycipher made in love — Part 1251104Feb. 16, 2019
RSA with Special d2412996Oct. 14, 2010
Polyphonic Substitution Cipher — Part 1241110Nov. 21, 2019
Polyphonic Substitution Cipher — Part 2221112Jan. 14, 2020
The Syllabary Cipher – Part 2221184Oct. 28, 2022
Purple 1201078Oct. 27, 2010
Breaking a Filter Generator201102Sept. 25, 2018
A Cloaked Substitution Cipher — Part 1201108Aug. 21, 2019
ASAC — A Strong(er) ADFGVX Cipher — Part 1191092July 9, 2016
Handycipher made in love — Part 2191106May 21, 2019
The T52 Sturgeon Challenge — Part 1191107July 13, 2019
A Cloaked Substitution Cipher — Part 2191108Aug. 25, 2019
Flawed Usage of a OTP Cipher by the BND181089Aug. 23, 2015
The T52 Sturgeon Challenge — Part 2181108July 22, 2019
Polyhomophonic Substitution — Part 3181114April 6, 2020
Sigaba Part 1171078Oct. 14, 2010
Cascading Encryption — Part 2/3171082March 25, 2013
Cipher ID — Part 1171110Nov. 19, 2019
The SZ42 Challenge — Part 1171117July 22, 2020
The SZ42 Challenge — Part 2171117Aug. 5, 2020
The Syllabary Cipher – Part 3171184Oct. 28, 2022
Concealed Messages — Vigenère's Night Sky160May 1, 2012
New Year's Greetings — Part 5161091March 21, 2016
The SZ42 Challenge — Part 4161118Aug. 29, 2020
Weakened Handycipher — Part 1151088May 13, 2015
The SZ42 Challenge — Part 3151118Aug. 15, 2020
The SZ42 Challenge — Part 5151118Sept. 3, 2020
Weakened Handycipher — Part 3141088May 13, 2015
The T52 Sturgeon Challenge — Part 3141108July 22, 2019
Wheatstone Cryptograph — Part 2141129May 21, 2021
Weakened Handycipher — Part 2131088May 13, 2015
The SZ42 Challenge — Part 6131119Oct. 2, 2020
The SZ42 Challenge — Part 8131120Oct. 31, 2020
Merkle-Hellman Knapsack Challenge — Part 2131181Oct. 14, 2022
The Hutton Cipher – Part 1131353May 2, 2023
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 2121079April 13, 2011
Cascading Encryption — Part 3/3121082March 29, 2013
ORYX Stream Cipher — Part 4a121085April 14, 2014
The T52 Sturgeon Challenge — Part 4121108July 22, 2019
The SZ42 Challenge — Part 7121120Oct. 27, 2020
The SZ42 Challenge — Part 9121122Dec. 19, 2020
The Josse Challenge – Part 1121226Feb. 10, 2023
The Syllabary Cipher – Part 4111184Oct. 28, 2022
The Syllabary Cipher – Part 5111184Oct. 28, 2022
The Josse Challenge – Part 2111237Feb. 25, 2023
Akelarre Part 1101078Nov. 24, 2010
Kaskade-S/T — Part 5101079May 5, 2011
The SIGABA Challenge — Part 1101113Feb. 29, 2020
Modified Vigenère Cipher101145Jan. 24, 2022
Hill Cipher101172Sept. 4, 2022
Double Column Transposition — Part 591085June 23, 2014
Hilly — Part 191094Jan. 25, 2017
The T52 Sturgeon Challenge — Part 891108Aug. 10, 2019
The SIGABA Challenge — Part 291113March 5, 2020
The SZ42 Challenge — Part 1291137Oct. 6, 2021
The Josse Challenge – Part 391268March 27, 2023
The T52 Sturgeon Challenge — Part 1181108Aug. 10, 2019
The T52 Sturgeon Challenge — Part 1281108Aug. 10, 2019
The SZ42 Challenge — Part 1381137Oct. 6, 2021
Alberti Challenge — Part 281156May 14, 2022
Handycipher — Part 271087March 3, 2015
Spirale — Part 171089Aug. 23, 2015
Spirale — Part 271089Aug. 23, 2015
Holographic Encryption — Part 171095April 7, 2017
"The Road" — Part 171103Dec. 8, 2018
The T52 Sturgeon Challenge — Part 971108Aug. 10, 2019
The T52 Sturgeon Challenge — Part 1071108Aug. 10, 2019
Handycipher — Part 3613168March 3, 2015
Kaskade-S/T — Part 6 (RansomKaskade Part 1)61096July 2, 2017
Weakened ElsieFour — Part 161100April 28, 2018
The T52 Sturgeon Challenge — Part 561108Aug. 10, 2019
The T52 Sturgeon Challenge — Part 661108Aug. 10, 2019
The T52 Sturgeon Challenge — Part 761108Aug. 10, 2019
The SIGABA Challenge — Part 3613593March 11, 2020
The Heavy T52 Sturgeon Challenge — Part 7613611April 23, 2020
Sigaba Part 2512996Oct. 14, 2010
Handycipher — Part 151087March 3, 2015
Spirale — Part 351089Aug. 23, 2015
Handycipher — Part 5513242June 28, 2016
Handycipher — Part 6513242June 28, 2016
Weakened Handycipher — Part 451092June 28, 2016
Weakened Handycipher — Part 551092June 28, 2016
Weakened Handycipher — Part 651092June 28, 2016
The SIGABA Challenge — Part 4513595March 17, 2020
The Heavy T52 Sturgeon Challenge — Part 4513607April 15, 2020
The Heavy T52 Sturgeon Challenge — Part 5513610April 21, 2020
The SZ42 Challenge — Part 1051124Jan. 30, 2021
Notes of an Italian Soldier40Oct. 14, 2010
Handycipher — Part 4413242June 28, 2016
ElsieFour — Part 1413330Oct. 3, 2017
Weakened ElsieFour — Part 341097Oct. 3, 2017
Christmas Challenge 2019: Differential Cryptanalysis — Part 141111Dec. 22, 2019
Differential Cryptanalysis — Part 241112Jan. 28, 2020
The Heavy T52 Sturgeon Challenge — Part 6413610April 22, 2020
The SZ42 Challenge — Part 1141124Jan. 30, 2021
Extended Handycipher — Part 131087March 27, 2015
Extended Handycipher — Part 231087March 27, 2015
Extended Handycipher — Part 331087March 27, 2015
Extended Handycipher — Part 4313242June 28, 2016
Extended Handycipher — Part 5313242June 28, 2016
Handycipher — Part 8313279Jan. 21, 2017
Handycipher — Part 9313279Jan. 21, 2017
Holographic Encryption — Part 231095April 7, 2017
The Vatican Challenge — Part 130Feb. 14, 2018
The Vatican Challenge — Part 230Feb. 14, 2018
Double Column Transposition20Oct. 14, 2010
Unknown Author2VariableOct. 14, 2010
ORYX Stream Cipher — Part 4b213125April 14, 2014
Extended Handycipher — Part 6213242June 28, 2016
Handycipher — Part 7213279Jan. 21, 2017
Catherine of Aragon's Letter to King Ferdinand, her Father (1509)2VariableNov. 28, 2018
The Heavy T52 Sturgeon Challenge — Part 2213533Oct. 9, 2019
The Heavy T52 Sturgeon Challenge — Part 3213539Oct. 26, 2019
The SIGABA Challenge — Part 5213599March 26, 2020
The Heavy T52 Sturgeon Challenge — Part 9213614April 30, 2020
SIGABA CSP-889 — Part 121129June 1, 2021
SIGABA CSP-889 — Part 221129June 1, 2021
SIGABA CSP-889 — Part 3213837June 1, 2021
SIGABA CSP-2900 — Part 121133July 31, 2021
SIGABA CSP-2900 — Part 221133July 31, 2021
SIGABA CSP-2900 — Part 3213883July 31, 2021
Beale Ciphers1VariableOct. 14, 2010
Substitution Cipher with Non-Prefix Codes113017June 15, 2011
Monoalphabetic Substitution with Camouflage — Part 611081June 30, 2012
ASAC — A Strong(er) ADFGVX Cipher — Part 211092July 9, 2016
Hilly — Part 211097Oct. 17, 2017
Weakened ElsieFour — Part 211100April 28, 2018
"The Road" — Part 211103Dec. 8, 2018
Handycipher — Part 1011107June 25, 2019
The Vatican Challenge — Part 41VariableJuly 7, 2019
The Heavy T52 Sturgeon Challenge — Part 1113530Sept. 30, 2019
The SIGABA Challenge — Part 6113603April 5, 2020
D'Agapeyeff0VariableOct. 14, 2010
Dorabella0VariableOct. 14, 2010
Kryptos0VariableOct. 14, 2010
World Record Challenge: Break 65 Bits of AES012996Oct. 14, 2010
Recovering the Private Key in the Fully Homomorphic Encryption Scheme013004Jan. 14, 2011
Twelve-Year-Old Murder Case0VariableApril 7, 2011
Kaskade-S/T — Part 401079May 5, 2011
Digital Signatures: DSA with Medium Fields013024Sept. 2, 2011
The third ENIGMA M4 message0VariableSept. 21, 2011
RSA Factoring Challenge: RSA-260013039Feb. 7, 2012
RSA Factoring Challenge: RSA-270013039Feb. 7, 2012
RSA Factoring Challenge: RSA-896013039Feb. 7, 2012
RSA Factoring Challenge: RSA-280013039Feb. 7, 2012
RSA Factoring Challenge: RSA-290013039Feb. 7, 2012
RSA Factoring Challenge: RSA-300013039Feb. 7, 2012
RSA Factoring Challenge: RSA-309013039Feb. 7, 2012
RSA Factoring Challenge: RSA-1024013039Feb. 7, 2012
RSA Factoring Challenge: RSA-310013039Feb. 7, 2012
RSA Factoring Challenge: RSA-320013039Feb. 7, 2012
RSA Factoring Challenge: RSA-330013039Feb. 7, 2012
RSA Factoring Challenge: RSA-340013039Feb. 7, 2012
RSA Factoring Challenge: RSA-350013039Feb. 7, 2012
RSA Factoring Challenge: RSA-360013039Feb. 7, 2012
RSA Factoring Challenge: RSA-370013039Feb. 7, 2012
RSA Factoring Challenge: RSA-380013039Feb. 7, 2012
RSA Factoring Challenge: RSA-390013039Feb. 7, 2012
RSA Factoring Challenge: RSA-400013039Feb. 7, 2012
RSA Factoring Challenge: RSA-410013039Feb. 7, 2012
RSA Factoring Challenge: RSA-420013039Feb. 7, 2012
RSA Factoring Challenge: RSA-430013039Feb. 7, 2012
RSA Factoring Challenge: RSA-440013039Feb. 7, 2012
RSA Factoring Challenge: RSA-450013039Feb. 7, 2012
RSA Factoring Challenge: RSA-460013039Feb. 7, 2012
RSA Factoring Challenge: RSA-1536013039Feb. 7, 2012
RSA Factoring Challenge: RSA-470013039Feb. 7, 2012
RSA Factoring Challenge: RSA-480013039Feb. 7, 2012
RSA Factoring Challenge: RSA-490013039Feb. 7, 2012
RSA Factoring Challenge: RSA-500013039Feb. 7, 2012
RSA Factoring Challenge: RSA-617013039Feb. 7, 2012
RSA Factoring Challenge: RSA-2048013039Feb. 7, 2012
ORYX Stream Cipher — Part 4d013091June 27, 2013
Double Column Transposition Reloaded — Part 1013111Dec. 11, 2013
Double Column Transposition Reloaded — Part 2013111Dec. 11, 2013
Double Column Transposition Reloaded — Part 3013111Dec. 11, 2013
Spanish Strip Cipher — Part 30VariableMarch 27, 2014
ORYX Stream Cipher — Part 4c013125April 14, 2014
Double-Column Transposition/Granit — Part 101088July 1, 2015
Double-Column Transposition/Granit — Part 201088July 1, 2015
Double-Column Transposition/Granit — Part 301088July 1, 2015
Spirale — Part 4013192Aug. 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 301103Dec. 8, 2018
The Vatican Challenge — Part 30VariableJune 25, 2019
The Vatican Challenge — Part 50VariableJuly 7, 2019
The Heavy T52 Sturgeon Challenge — Part 8013611April 24, 2020
A Heavy SZ42 Challenge – Part 14014808Dec. 30, 2022

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