Account

Name
George
Username
Theofanidis
Joined
Dec. 18, 2011, 12:41 p.m.

Rank
14
Points
137,118
Trophies
Gold3
Silver2
Bronze2

Active Challenges (7)

LevelNameAttemptsDate
The SZ42 Challenge — Part 31 / 15Sept. 11, 2021, 9:43 p.m.
World Record Challenge: Break 65 Bits of AES1 / 50Feb. 19, 2021, 10:45 p.m.
The SIGABA Challenge — Part 11 / 15April 7, 2020, 10:44 a.m.
Cryptanalysis Hacking Puzzles — Part 15 / 15Feb. 19, 2019, 11:28 a.m.
Double-Column Transposition/Granit — Part 11 / 15July 4, 2015, 10:31 p.m.
Handycipher — Part 12 / 15March 11, 2015, 9:27 p.m.
Enigma Messages1 / 15Feb. 17, 2013, 5:11 p.m.

Solved Challenges (169)

LevelNamePointsDate
The SZ42 Challenge — Part 131,725Oct. 8, 2021, 11:29 p.m.
The SZ42 Challenge — Part 121,725Oct. 8, 2021, 8:26 p.m.
The SZ42 Challenge — Part 21,151Sept. 30, 2021, 12:09 a.m.
The SZ42 Challenge — Part 11,152Sept. 5, 2021, 5:54 p.m.
The SZ42 Challenge — Part 91,178Aug. 16, 2021, 2:18 a.m.
The SZ42 Challenge — Part 61,167July 28, 2021, 9:08 p.m.
The SZ42 Challenge — Part 71,173July 18, 2021, 3:54 p.m.
The SZ42 Challenge — Part 51,164July 17, 2021, 12:04 a.m.
The SZ42 Challenge — Part 41,163July 16, 2021, 10:52 a.m.
The SZ42 Challenge — Part 81,174July 15, 2021, 5:11 a.m.
The T52 Sturgeon Challenge — Part 31,130June 30, 2021, 11:28 a.m.
The T52 Sturgeon Challenge — Part 21,131June 20, 2021, 2:04 p.m.
The T52 Sturgeon Challenge — Part 11,130June 15, 2021, 11:06 p.m.
Wheatstone Cryptograph — Part 1150April 23, 2021, 12:31 a.m.
M-138 — Part 41,094March 21, 2021, 11:21 p.m.
Find the right route — Part 3107Jan. 8, 2021, 7:40 p.m.
Find the right route — Part 2106Jan. 3, 2021, 8:42 p.m.
Find the right route — Part 1104Nov. 21, 2020, 10:35 p.m.
Modular Sequences100Oct. 20, 2020, 4:35 p.m.
Lightweight Introduction to Lattices — Part 2101Aug. 29, 2020, 9:12 p.m.
Lightweight Introduction to Lattices — Part 31,824July 17, 2020, 7:54 p.m.
Lightweight Introduction to Lattices — Part 1117May 21, 2020, 10:11 p.m.
Polyhomophonic Substitution — Part 1107April 5, 2020, 4:16 p.m.
RSA Factoring Challenge: RSA-2320March 12, 2020, 9:24 p.m.
RSA Factoring Challenge: RSA-2500March 12, 2020, 9:20 p.m.
Polyphonic Substitution Cipher — Part 21,284March 4, 2020, 9:43 p.m.
Polyphonic Substitution Cipher — Part 11,229March 1, 2020, 8:01 p.m.
Cipher ID — Part 11,252Feb. 2, 2020, 8:21 a.m.
RSA Factoring Challenge: RSA-2400Dec. 15, 2019, 10:40 p.m.
Homophonic Encryption — Part 41,196Oct. 27, 2019, 8 p.m.
A Cloaked Substitution Cipher — Part 21,576Aug. 31, 2019, 12:32 a.m.
A Cloaked Substitution Cipher — Part 11,660Aug. 24, 2019, 7:27 p.m.
Homophonic Encryption — Part 31,310June 15, 2019, 11:35 p.m.
Spanish Strip Cipher — Part 11,099June 11, 2019, 9:41 p.m.
Handycipher made in love — Part 21,725May 23, 2019, 11 p.m.
Homophonic Encryption — Part 21,469May 19, 2019, 4:12 p.m.
Homophonic Encryption — Part 11,824May 5, 2019, 7:47 p.m.
Cryptanalysis Hacking Puzzles — Part 2133Jan. 11, 2019, 6:10 p.m.
Number Sequence — Part 9100Jan. 9, 2019, 7:20 p.m.
Image Noise100Jan. 7, 2019, 6:24 p.m.
News from Castle Mansfeld100Dec. 24, 2018, 1:35 p.m.
Strange Message from Thessaloniki100Dec. 20, 2018, 7:45 p.m.
RSA Factoring Challenge: RSA-2300Nov. 7, 2018, 6:49 p.m.
Weakened ElsieFour — Part 11,200Oct. 6, 2018, 8:53 p.m.
Autokey Cipher120Sept. 29, 2018, 5:44 p.m.
Advent Challenge — Part 31,190July 2, 2018, 10:33 p.m.
Trendy Messenger1,523June 19, 2018, 7:26 p.m.
Summer Job1,613June 17, 2018, 11:54 a.m.
Fastest in the West1,660June 15, 2018, 8:11 p.m.
Number Sequence — Part 10103May 27, 2018, 5:04 p.m.
Number Sequence — Part 6100April 6, 2018, 10:51 a.m.
The Einstein Enigma1,613Feb. 12, 2018, 8:34 p.m.
Advent Challenge — Part 41,302Jan. 31, 2018, 6:24 p.m.
Advent-Challenge — Part 21,469Dec. 26, 2017, 8:17 p.m.
Advent-Challenge — Part 1107Dec. 22, 2017, 6:26 p.m.
RSA Factoring Challenge: RSA-2200July 22, 2017, 1:24 p.m.
New Year's Greetings — Part 4100Oct. 10, 2016, 8:39 p.m.
New Year's Greetings — Part 3100Oct. 9, 2016, 6:21 p.m.
New Year's Greetings — Part 2100Oct. 9, 2016, 4:36 p.m.
New Year's Greetings — Part 1101Sept. 29, 2016, 4:46 p.m.
Weakened Granit — Part 1104Oct. 19, 2015, 8:53 a.m.
Number Sequence — Part 7102May 7, 2015, 4:55 p.m.
M-138 — Part 31,613Dec. 28, 2014, 10:36 p.m.
Purple 11,105Dec. 27, 2014, 9:52 a.m.
M-138 — Part 21,824Dec. 25, 2014, 2:43 a.m.
M-138 — Part 1200Dec. 24, 2014, 8:37 p.m.
An 'unhearable' message100Dec. 17, 2014, 9:25 p.m.
An Invisible Message100Nov. 18, 2014, 4:59 p.m.
Double Column Transposition — Part 51,211Nov. 5, 2014, 1:45 p.m.
Double Column Transposition — Part 11,185Nov. 1, 2014, 10:52 a.m.
Heartbleed — Part 2103Oct. 5, 2014, 9:32 a.m.
Heartbleed — Part 1 103Oct. 4, 2014, 8:38 p.m.
The Last Note111Sept. 30, 2014, 11:05 p.m.
Double Column Transposition — Part 41,305June 29, 2014, 11:55 a.m.
Double Column Transposition — Part 31,283June 22, 2014, 7:35 p.m.
Monoalphabetic Substitution with Camouflage — Part 51,125June 9, 2014, 4:23 p.m.
Monoalphabetic substitution with camouflage — Part 31,121June 7, 2014, 9:16 p.m.
Monoalphabetic substitution with camouflage — Part 21,121June 6, 2014, 10:15 p.m.
Double Column Transposition — Part 21,660May 5, 2014, 8:22 p.m.
Enigma Messages with Repeated Letters — Part 4125March 9, 2014, 8:56 a.m.
Enigma Messages with Repeated Letters — Part 3133March 8, 2014, 10:06 a.m.
Enigma Messages with Repeated Letters — Part 5200March 5, 2014, 9:01 p.m.
RSA with Special d13,568Feb. 27, 2014, 5:15 p.m.
Unusual encryption using a diophantine equation1,122Feb. 5, 2014, 8:13 p.m.
Ku Klux Klan1,050Jan. 21, 2014, 3:05 a.m.
Keyshanc — Part 21,136Jan. 19, 2014, 2:12 p.m.
Monoalphabetic substitution with camouflage — Part 4100Dec. 29, 2013, 7:41 p.m.
CMEA 213,616Dec. 27, 2013, 9:39 p.m.
A really long number sequence1,124Dec. 21, 2013, 11:58 a.m.
Smartcard RSA1,114Dec. 7, 2013, 1:03 p.m.
CMEA 11,115Dec. 6, 2013, 11:51 a.m.
RSA Factoring Challenge: RSA-2100Dec. 2, 2013, 6:54 p.m.
Monoalphabetic substitution with camouflage — Part 1100Nov. 29, 2013, 12:02 a.m.
RSA Factoring Challenge: RSA-7040Nov. 24, 2013, 9 a.m.
Pigpen with a twist — Part 31,126Nov. 10, 2013, 12:45 p.m.
Enigma Messages with Repeated Letters — Part 2108Nov. 9, 2013, 11:09 p.m.
Zodiac Cipher100Nov. 2, 2013, 10:39 a.m.
Trifid Cipher120Nov. 1, 2013, 11:38 p.m.
Pigpen with a twist — Part 21,126Oct. 28, 2013, 11:38 a.m.
Music Code — Part 21,122Oct. 20, 2013, 9:36 p.m.
Playfair Encryption100Oct. 6, 2013, 9:02 p.m.
Enigma Messages with Repeated Letters — Part 1200Sept. 26, 2013, 8:04 p.m.
Music Code — Part 1100Sept. 9, 2013, 8:29 p.m.
From Russia with Love200Sept. 4, 2013, 7:36 p.m.
Hill Cipher with Sudoku Key200Sept. 4, 2013, 6:43 p.m.
Nils away on travel200Aug. 8, 2013, 9:19 p.m.
Not-so-Secret Message from Malawi — Part I (RSA)1,117Aug. 7, 2013, 7:30 p.m.
Unconcealed RSA messages1,137June 17, 2013, 10:16 p.m.
ORYX Stream Cipher — Part 3 (revised)2,000June 7, 2013, 5:16 a.m.
Typex — Part 11,256May 10, 2013, 6:12 a.m.
Typex — Part 21,362April 27, 2013, 11:56 a.m.
Snow White and the seven dwarfs120April 24, 2013, 10:39 p.m.
Cascading Encryption — Part 1/3101April 10, 2013, 3:05 p.m.
Enigma Part 21,122April 4, 2013, 8:40 p.m.
Enigma Part 11,122March 15, 2013, 2:30 p.m.
ORYX Stream Cipher Part II1,123March 12, 2013, 12:17 a.m.
Reserve Hand Procedure — Part 1200March 7, 2013, 12:02 p.m.
How do you become a big cryptographer?100Feb. 25, 2013, 8:35 p.m.
ORYX Stream Cipher Part I1,125Jan. 20, 2013, 1:55 p.m.
Number Sequence — Part 5100Jan. 10, 2013, 8:01 a.m.
Molehunt (Part 3/3)1,127Dec. 2, 2012, 8:32 p.m.
Recycled One-Time Pad109Nov. 30, 2012, 8:34 p.m.
A Secret Message from Castle Mansfeld100Nov. 27, 2012, 5:29 p.m.
Monoalphabetic Substitution100Nov. 19, 2012, 1:38 p.m.
Cracking SHA1-Hashed Passwords1,138Nov. 6, 2012, 8:37 a.m.
Kaskade-S/T — Part 31,136Nov. 3, 2012, 10:55 p.m.
Factorization Cipher — Part 21,161Oct. 30, 2012, 3:43 a.m.
Letter to the Templars — Part 32,000Oct. 10, 2012, 2:15 p.m.
Enigma Combinatorics100Sept. 11, 2012, 7:54 a.m.
¿No Hablas Español? No problemo!101Sept. 10, 2012, 4:22 p.m.
The Book Code: A Challenge for Bookworms101Aug. 30, 2012, 5:35 p.m.
Partial Key Exposure with RSA — Part 11,187Aug. 30, 2012, 8:15 a.m.
Kaskade-S/T — Part 21,141Aug. 24, 2012, 7:51 p.m.
AES key — encoded in the machine readable zone of a European ePassport1,184Aug. 16, 2012, 6:40 p.m.
Beaver Code200Aug. 13, 2012, 11:38 p.m.
Letter to the Templars — Part 2200July 30, 2012, 9:47 p.m.
Brute-Force-Attack on Triple-DES with Reduced Key Space1,133July 29, 2012, 6:07 p.m.
Keyshanc — Part 11,259July 29, 2012, 4:49 p.m.
Letter to the Templars — Part 1150July 18, 2012, 12:55 a.m.
Kaskade-S/T — Part 1100July 4, 2012, 4:58 p.m.
Hybrid Encryption I1,136June 29, 2012, 7:10 p.m.
Broadcasting and low exponent — RSA Attack1,163June 10, 2012, 11:32 p.m.
Alice's Birthday Party (Part 1)1,137May 31, 2012, 8:41 a.m.
Alice's Birthday Party (Part 2)1,137May 31, 2012, 12:24 a.m.
Modified Caesar Cipher100May 25, 2012, 7:40 p.m.
Classical Ciphers^3100May 22, 2012, 11:42 a.m.
RSA: Two different keys — same ciphertext1,173May 5, 2012, 7:18 p.m.
Number Sequence — Part 4113April 26, 2012, 1:31 p.m.
Turing Bombe Enigma I101April 23, 2012, 6:16 p.m.
Factorization Cipher — Part 1101April 22, 2012, 6:36 p.m.
ECDH-Key Exchange for Beginners102April 16, 2012, 11:44 p.m.
Letter from the Alleged Countess Julie von Ortenburg100April 16, 2012, 11 p.m.
Molehunt (Part 1/3)100April 11, 2012, 12:50 p.m.
Molehunt (Part 2/3)100April 11, 2012, 11:05 a.m.
Number Sequence — Part 3125April 3, 2012, 2:12 p.m.
Double Columnar Transposition101March 21, 2012, 7:51 p.m.
A modified homophonic cipher with reduced alphabets — Part 2100March 15, 2012, 2:41 p.m.
One-Time Pad with Flaws100March 13, 2012, 7:50 p.m.
A modified homophonic cipher with reduced alphabets — Part 1100March 10, 2012, 9:15 a.m.
ADFGVX — Part 1100March 7, 2012, 1:20 p.m.
Pigpen with a twist — Part 1101March 6, 2012, 12:33 p.m.
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1100Feb. 25, 2012, 4:57 p.m.
ADFGVX — Part 2101Feb. 20, 2012, 11:04 a.m.
Grille Cipher101Feb. 1, 2012, 9:56 p.m.
Caesar Encryption100Jan. 19, 2012, 4:30 p.m.
Number Sequence — Part 2101Jan. 14, 2012, 2:03 p.m.
Number Sequence100Jan. 14, 2012, 12:49 p.m.
Affine Codes / Modulo Arithmetic with N / Extended Euclid101Jan. 12, 2012, 7:27 p.m.
Original Caesar Cipher100Dec. 22, 2011, 3:34 p.m.

Submitted Challenges (10)

LevelNameDate
The LoRa Cipher: Logic Randomness — Part 1Feb. 19, 2020, 8:31 p.m.
Handycipher made in love — Part 1Feb. 16, 2019, 12:29 p.m.
Monoalphabetic Substitution with Nostradamus FlavorFeb. 16, 2019, 12:28 p.m.
Number Sequence — Part 8Sept. 14, 2015, 8:54 a.m.
A hidden word — Part 2April 16, 2015, 4:47 p.m.
Multilingual Monoalphabetic SubstitutionJan. 30, 2013, 2:27 p.m.
Enigma MessagesJan. 23, 2013, 3:32 p.m.
Playfair with hints about the gridJan. 16, 2013, noon
A hidden wordJan. 6, 2013, 2:32 p.m.
BCR code (Book-Caesar-RSA)Sept. 12, 2012, 6:35 p.m.

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