Account

Name

George

Username

Theofanidis

Joined

Dec. 18, 2011, 12:41 p.m.

Points

208,721

Rank

Trophies

Progress

85 / 92

116 / 177

7 / 75

1 / 18

Links

Forum profile

Active Challenges (8)

Name	Attempts	Date
The SZ42 Challenge — Part 10	9 / 15	Jan. 24, 2023, 6:06 p.m.
The Heavy T52 Sturgeon Challenge — Part 2	1 / 15	Sept. 15, 2022, 10:19 p.m.
World Record Challenge: Break 65 Bits of AES	1 / 50	Feb. 19, 2021, 10:45 p.m.
The SIGABA Challenge — Part 1	1 / 15	April 7, 2020, 10:44 a.m.
Cryptanalysis Hacking Puzzles — Part 1	5 / 15	Feb. 19, 2019, 11:28 a.m.
Double-Column Transposition/Granit — Part 1	1 / 15	July 4, 2015, 10:31 p.m.
Handycipher — Part 1	2 / 15	March 11, 2015, 9:27 p.m.
Enigma Messages	1 / 15	Feb. 17, 2013, 5:11 p.m.

Solved Challenges (209)

Name	Points	Date
The Hutton Cipher – Part 2	1,824	June 6, 2023, 9:56 p.m.
The Hutton Cipher – Part 1	1,660	May 6, 2023, 8:58 a.m.
The Josse Challenge – Part 3	1,725	March 29, 2023, 6:08 p.m.
Spirale — Part 3	1,089	March 27, 2023, 12:04 a.m.
Spirale — Part 1	1,089	March 11, 2023, 12:56 a.m.
Spirale — Part 2	1,089	March 10, 2023, 11:02 p.m.
The Josse Challenge – Part 2	1,824	Feb. 26, 2023, 7:42 p.m.
The Josse Challenge – Part 1	1,444	Feb. 22, 2023, 8:07 p.m.
Polyhomophonic Substitution — Part 3	1,117	Jan. 27, 2023, 6:42 p.m.
Flawed Usage of a OTP Cipher by the BND	1,090	Dec. 14, 2022, 1:11 a.m.
ASAC — A Strong(er) ADFGVX Cipher — Part 1	1,093	Dec. 10, 2022, 12:34 a.m.
Hill Cipher	1,235	Dec. 7, 2022, 9:24 p.m.
The Syllabary Cipher – Part 4	1,324	Nov. 30, 2022, 7:56 p.m.
The Syllabary Cipher – Part 5	1,327	Nov. 29, 2022, 9:36 p.m.
The Syllabary Cipher – Part 3	1,327	Nov. 29, 2022, 3:07 p.m.
The Heavy T52 Sturgeon Challenge — Part 5	13,697	Nov. 28, 2022, 12:01 a.m.
Not-so-Secret Message from Malawi — Part II (ECC)	1,079	Nov. 23, 2022, 10:34 p.m.
Merkle-Hellman Knapsack Challenge — Part 2	1,353	Nov. 8, 2022, 5:34 p.m.
Lattice Part 1	1,079	Nov. 7, 2022, 9:05 p.m.
The Syllabary Cipher – Part 2	1,523	Nov. 5, 2022, 3:52 a.m.
The Syllabary Cipher – Part 1	200	Oct. 28, 2022, 2:34 p.m.
Merkle-Hellman Knapsack Challenge - Part 1	150	Oct. 15, 2022, 9:21 p.m.
The Heavy T52 Sturgeon Challenge — Part 7	13,745	Sept. 6, 2022, 1:45 a.m.
The T52 Sturgeon Challenge — Part 10	1,115	Aug. 31, 2022, 7:26 p.m.
The T52 Sturgeon Challenge — Part 12	1,115	Aug. 22, 2022, 6:35 p.m.
The T52 Sturgeon Challenge — Part 4	1,115	July 20, 2022, 2:40 a.m.
The T52 Sturgeon Challenge — Part 9	1,116	June 28, 2022, 5:41 p.m.
Alberti Challenge — Part 2	1,385	June 2, 2022, 7:43 p.m.
Spanish Strip Cipher — Part 2	1,087	May 29, 2022, 4:03 p.m.
AES ECB Wrong Encoding	1,104	May 14, 2022, 11:35 p.m.
The T52 Sturgeon Challenge — Part 11	1,118	May 12, 2022, 11:20 p.m.
Polyhomophonic Substitution — Part 2	1,129	April 7, 2022, 8 p.m.
Lunchtime Attack on the Fully Homomorphic Encryption Scheme	1,080	April 3, 2022, 6:52 p.m.
Alberti Challenge — Part 1	200	March 27, 2022, 12:24 a.m.
Factorization Cipher — Part 3	1,082	March 26, 2022, 2:11 a.m.
Cascading Encryption — Part 2/3	1,085	March 18, 2022, 5:34 p.m.
The SZ42 Challenge — Part 3	1,138	March 16, 2022, 8:14 p.m.
The T52 Sturgeon Challenge — Part 8	1,120	March 2, 2022, 11:08 p.m.
Modified Vigenère Cipher	1,349	Feb. 20, 2022, 1:08 a.m.
Wheatstone Cryptograph — Part 2	1,182	Dec. 29, 2021, 1:54 p.m.
The SZ42 Challenge — Part 13	1,725	Oct. 8, 2021, 11:29 p.m.
The SZ42 Challenge — Part 12	1,725	Oct. 8, 2021, 8:26 p.m.
The SZ42 Challenge — Part 2	1,151	Sept. 30, 2021, 12:09 a.m.
The SZ42 Challenge — Part 1	1,152	Sept. 5, 2021, 5:54 p.m.
The SZ42 Challenge — Part 9	1,178	Aug. 16, 2021, 2:18 a.m.
The SZ42 Challenge — Part 6	1,167	July 28, 2021, 9:08 p.m.
The SZ42 Challenge — Part 7	1,173	July 18, 2021, 3:54 p.m.
The SZ42 Challenge — Part 5	1,164	July 17, 2021, 12:04 a.m.
The SZ42 Challenge — Part 4	1,163	July 16, 2021, 10:52 a.m.
The SZ42 Challenge — Part 8	1,174	July 15, 2021, 5:11 a.m.
The T52 Sturgeon Challenge — Part 3	1,130	June 30, 2021, 11:28 a.m.
The T52 Sturgeon Challenge — Part 2	1,131	June 20, 2021, 2:04 p.m.
The T52 Sturgeon Challenge — Part 1	1,130	June 15, 2021, 11:06 p.m.
Wheatstone Cryptograph — Part 1	150	April 23, 2021, 12:31 a.m.
M-138 — Part 4	1,094	March 21, 2021, 11:21 p.m.
Find the right route — Part 3	107	Jan. 8, 2021, 7:40 p.m.
Find the right route — Part 2	106	Jan. 3, 2021, 8:42 p.m.
Find the right route — Part 1	104	Nov. 21, 2020, 10:35 p.m.
Modular Sequences	100	Oct. 20, 2020, 4:35 p.m.
Lightweight Introduction to Lattices — Part 2	101	Aug. 29, 2020, 9:12 p.m.
Lightweight Introduction to Lattices — Part 3	1,824	July 17, 2020, 7:54 p.m.
Lightweight Introduction to Lattices — Part 1	117	May 21, 2020, 10:11 p.m.
Polyhomophonic Substitution — Part 1	107	April 5, 2020, 4:16 p.m.
RSA Factoring Challenge: RSA-232	0	March 12, 2020, 9:24 p.m.
RSA Factoring Challenge: RSA-250	0	March 12, 2020, 9:20 p.m.
Polyphonic Substitution Cipher — Part 2	1,284	March 4, 2020, 9:43 p.m.
Polyphonic Substitution Cipher — Part 1	1,229	March 1, 2020, 8:01 p.m.
Cipher ID — Part 1	1,252	Feb. 2, 2020, 8:21 a.m.
RSA Factoring Challenge: RSA-240	0	Dec. 15, 2019, 10:40 p.m.
Homophonic Encryption — Part 4	1,196	Oct. 27, 2019, 8 p.m.
A Cloaked Substitution Cipher — Part 2	1,576	Aug. 31, 2019, 12:32 a.m.
A Cloaked Substitution Cipher — Part 1	1,660	Aug. 24, 2019, 7:27 p.m.
Homophonic Encryption — Part 3	1,310	June 15, 2019, 11:35 p.m.
Spanish Strip Cipher — Part 1	1,099	June 11, 2019, 9:41 p.m.
Handycipher made in love — Part 2	1,725	May 23, 2019, 11 p.m.
Homophonic Encryption — Part 2	1,469	May 19, 2019, 4:12 p.m.
Homophonic Encryption — Part 1	1,824	May 5, 2019, 7:47 p.m.
Cryptanalysis Hacking Puzzles — Part 2	133	Jan. 11, 2019, 6:10 p.m.
Number Sequence — Part 9	100	Jan. 9, 2019, 7:20 p.m.
Image Noise	100	Jan. 7, 2019, 6:24 p.m.
News from Castle Mansfeld	100	Dec. 24, 2018, 1:35 p.m.
Strange Message from Thessaloniki	100	Dec. 20, 2018, 7:45 p.m.
RSA Factoring Challenge: RSA-230	0	Nov. 7, 2018, 6:49 p.m.
Weakened ElsieFour — Part 1	1,200	Oct. 6, 2018, 8:53 p.m.
Autokey Cipher	120	Sept. 29, 2018, 5:44 p.m.
Advent Challenge — Part 3	1,190	July 2, 2018, 10:33 p.m.
Trendy Messenger	1,523	June 19, 2018, 7:26 p.m.
Summer Job	1,613	June 17, 2018, 11:54 a.m.
Fastest in the West	1,660	June 15, 2018, 8:11 p.m.
Number Sequence — Part 10	103	May 27, 2018, 5:04 p.m.
Number Sequence — Part 6	100	April 6, 2018, 10:51 a.m.
The Einstein Enigma	1,613	Feb. 12, 2018, 8:34 p.m.
Advent Challenge — Part 4	1,302	Jan. 31, 2018, 6:24 p.m.
Advent-Challenge — Part 2	1,469	Dec. 26, 2017, 8:17 p.m.
Advent-Challenge — Part 1	107	Dec. 22, 2017, 6:26 p.m.
RSA Factoring Challenge: RSA-220	0	July 22, 2017, 1:24 p.m.
New Year's Greetings — Part 4	100	Oct. 10, 2016, 8:39 p.m.
New Year's Greetings — Part 3	100	Oct. 9, 2016, 6:21 p.m.
New Year's Greetings — Part 2	100	Oct. 9, 2016, 4:36 p.m.
New Year's Greetings — Part 1	101	Sept. 29, 2016, 4:46 p.m.
Weakened Granit — Part 1	104	Oct. 19, 2015, 8:53 a.m.
Number Sequence — Part 7	102	May 7, 2015, 4:55 p.m.
M-138 — Part 3	1,613	Dec. 28, 2014, 10:36 p.m.
Purple 1	1,105	Dec. 27, 2014, 9:52 a.m.
M-138 — Part 2	1,824	Dec. 25, 2014, 2:43 a.m.
M-138 — Part 1	200	Dec. 24, 2014, 8:37 p.m.
An 'unhearable' message	100	Dec. 17, 2014, 9:25 p.m.
An Invisible Message	100	Nov. 18, 2014, 4:59 p.m.
Double Column Transposition — Part 5	1,211	Nov. 5, 2014, 1:45 p.m.
Double Column Transposition — Part 1	1,185	Nov. 1, 2014, 10:52 a.m.
Heartbleed — Part 2	103	Oct. 5, 2014, 9:32 a.m.
Heartbleed — Part 1	103	Oct. 4, 2014, 8:38 p.m.
The Last Note	111	Sept. 30, 2014, 11:05 p.m.
Double Column Transposition — Part 4	1,305	June 29, 2014, 11:55 a.m.
Double Column Transposition — Part 3	1,283	June 22, 2014, 7:35 p.m.
Monoalphabetic Substitution with Camouflage — Part 5	1,125	June 9, 2014, 4:23 p.m.
Monoalphabetic substitution with camouflage — Part 3	1,121	June 7, 2014, 9:16 p.m.
Monoalphabetic substitution with camouflage — Part 2	1,121	June 6, 2014, 10:15 p.m.
Double Column Transposition — Part 2	1,660	May 5, 2014, 8:22 p.m.
Enigma Messages with Repeated Letters — Part 4	125	March 9, 2014, 8:56 a.m.
Enigma Messages with Repeated Letters — Part 3	133	March 8, 2014, 10:06 a.m.
Enigma Messages with Repeated Letters — Part 5	200	March 5, 2014, 9:01 p.m.
RSA with Special d	13,568	Feb. 27, 2014, 5:15 p.m.
Unusual encryption using a diophantine equation	1,122	Feb. 5, 2014, 8:13 p.m.
Ku Klux Klan	1,050	Jan. 21, 2014, 3:05 a.m.
Keyshanc — Part 2	1,136	Jan. 19, 2014, 2:12 p.m.
Monoalphabetic substitution with camouflage — Part 4	100	Dec. 29, 2013, 7:41 p.m.
CMEA 2	13,616	Dec. 27, 2013, 9:39 p.m.
A really long number sequence	1,124	Dec. 21, 2013, 11:58 a.m.
Smartcard RSA	1,114	Dec. 7, 2013, 1:03 p.m.
CMEA 1	1,115	Dec. 6, 2013, 11:51 a.m.
RSA Factoring Challenge: RSA-210	0	Dec. 2, 2013, 6:54 p.m.
Monoalphabetic substitution with camouflage — Part 1	100	Nov. 29, 2013, 12:02 a.m.
RSA Factoring Challenge: RSA-704	0	Nov. 24, 2013, 9 a.m.
Pigpen with a twist — Part 3	1,126	Nov. 10, 2013, 12:45 p.m.
Enigma Messages with Repeated Letters — Part 2	108	Nov. 9, 2013, 11:09 p.m.
Zodiac Cipher	100	Nov. 2, 2013, 10:39 a.m.
Trifid Cipher	120	Nov. 1, 2013, 11:38 p.m.
Pigpen with a twist — Part 2	1,126	Oct. 28, 2013, 11:38 a.m.
Music Code — Part 2	1,122	Oct. 20, 2013, 9:36 p.m.
Playfair Encryption	100	Oct. 6, 2013, 9:02 p.m.
Enigma Messages with Repeated Letters — Part 1	200	Sept. 26, 2013, 8:04 p.m.
Music Code — Part 1	100	Sept. 9, 2013, 8:29 p.m.
From Russia with Love	200	Sept. 4, 2013, 7:36 p.m.
Hill Cipher with Sudoku Key	200	Sept. 4, 2013, 6:43 p.m.
Nils away on travel	200	Aug. 8, 2013, 9:19 p.m.
Not-so-Secret Message from Malawi — Part I (RSA)	1,117	Aug. 7, 2013, 7:30 p.m.
Unconcealed RSA messages	1,137	June 17, 2013, 10:16 p.m.
ORYX Stream Cipher — Part 3 (revised)	2,000	June 7, 2013, 5:16 a.m.
Typex — Part 1	1,256	May 10, 2013, 6:12 a.m.
Typex — Part 2	1,362	April 27, 2013, 11:56 a.m.
Snow White and the seven dwarfs	120	April 24, 2013, 10:39 p.m.
Cascading Encryption — Part 1/3	101	April 10, 2013, 3:05 p.m.
Enigma Part 2	1,122	April 4, 2013, 8:40 p.m.
Enigma Part 1	1,122	March 15, 2013, 2:30 p.m.
ORYX Stream Cipher Part II	1,123	March 12, 2013, 12:17 a.m.
Reserve Hand Procedure — Part 1	200	March 7, 2013, 12:02 p.m.
How do you become a big cryptographer?	100	Feb. 25, 2013, 8:35 p.m.
ORYX Stream Cipher Part I	1,125	Jan. 20, 2013, 1:55 p.m.
Number Sequence — Part 5	100	Jan. 10, 2013, 8:01 a.m.
Molehunt (Part 3/3)	1,127	Dec. 2, 2012, 8:32 p.m.
Recycled One-Time Pad	109	Nov. 30, 2012, 8:34 p.m.
A Secret Message from Castle Mansfeld	100	Nov. 27, 2012, 5:29 p.m.
Monoalphabetic Substitution	100	Nov. 19, 2012, 1:38 p.m.
Cracking SHA1-Hashed Passwords	1,138	Nov. 6, 2012, 8:37 a.m.
Kaskade-S/T — Part 3	1,136	Nov. 3, 2012, 10:55 p.m.
Factorization Cipher — Part 2	1,161	Oct. 30, 2012, 3:43 a.m.
Letter to the Templars — Part 3	2,000	Oct. 10, 2012, 2:15 p.m.
Enigma Combinatorics	100	Sept. 11, 2012, 7:54 a.m.
¿No Hablas Español? No problemo!	101	Sept. 10, 2012, 4:22 p.m.
The Book Code: A Challenge for Bookworms	101	Aug. 30, 2012, 5:35 p.m.
Partial Key Exposure with RSA — Part 1	1,187	Aug. 30, 2012, 8:15 a.m.
Kaskade-S/T — Part 2	1,141	Aug. 24, 2012, 7:51 p.m.
AES key — encoded in the machine readable zone of a European ePassport	1,184	Aug. 16, 2012, 6:40 p.m.
Beaver Code	200	Aug. 13, 2012, 11:38 p.m.
Letter to the Templars — Part 2	200	July 30, 2012, 9:47 p.m.
Brute-Force-Attack on Triple-DES with Reduced Key Space	1,133	July 29, 2012, 6:07 p.m.
Keyshanc — Part 1	1,259	July 29, 2012, 4:49 p.m.
Letter to the Templars — Part 1	150	July 18, 2012, 12:55 a.m.
Kaskade-S/T — Part 1	100	July 4, 2012, 4:58 p.m.
Hybrid Encryption I	1,136	June 29, 2012, 7:10 p.m.
Broadcasting and low exponent — RSA Attack	1,163	June 10, 2012, 11:32 p.m.
Alice's Birthday Party (Part 1)	1,137	May 31, 2012, 8:41 a.m.
Alice's Birthday Party (Part 2)	1,137	May 31, 2012, 12:24 a.m.
Modified Caesar Cipher	100	May 25, 2012, 7:40 p.m.
Classical Ciphers^3	100	May 22, 2012, 11:42 a.m.
RSA: Two different keys — same ciphertext	1,173	May 5, 2012, 7:18 p.m.
Number Sequence — Part 4	113	April 26, 2012, 1:31 p.m.
Turing Bombe Enigma I	101	April 23, 2012, 6:16 p.m.
Factorization Cipher — Part 1	101	April 22, 2012, 6:36 p.m.
ECDH-Key Exchange for Beginners	102	April 16, 2012, 11:44 p.m.
Letter from the Alleged Countess Julie von Ortenburg	100	April 16, 2012, 11 p.m.
Molehunt (Part 1/3)	100	April 11, 2012, 12:50 p.m.
Molehunt (Part 2/3)	100	April 11, 2012, 11:05 a.m.
Number Sequence — Part 3	125	April 3, 2012, 2:12 p.m.
Double Columnar Transposition	101	March 21, 2012, 7:51 p.m.
A modified homophonic cipher with reduced alphabets — Part 2	100	March 15, 2012, 2:41 p.m.
One-Time Pad with Flaws	100	March 13, 2012, 7:50 p.m.
A modified homophonic cipher with reduced alphabets — Part 1	100	March 10, 2012, 9:15 a.m.
ADFGVX — Part 1	100	March 7, 2012, 1:20 p.m.
Pigpen with a twist — Part 1	101	March 6, 2012, 12:33 p.m.
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1	100	Feb. 25, 2012, 4:57 p.m.
ADFGVX — Part 2	101	Feb. 20, 2012, 11:04 a.m.
Grille Cipher	101	Feb. 1, 2012, 9:56 p.m.
Caesar Encryption	100	Jan. 19, 2012, 4:30 p.m.
Number Sequence — Part 2	101	Jan. 14, 2012, 2:03 p.m.
Number Sequence	100	Jan. 14, 2012, 12:49 p.m.
Affine Codes / Modulo Arithmetic with N / Extended Euclid	101	Jan. 12, 2012, 7:27 p.m.
Original Caesar Cipher	100	Dec. 22, 2011, 3:34 p.m.

Submitted Challenges (10)

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