Account

Name
Em Doulgerakis
Username
Greko
Joined
June 30, 2012, 10:23 a.m.

Rank
10
Points
193,799
Trophies
Gold3
Silver0
Bronze3

Solved Challenges (175)

LevelNamePointsDate
The SIGABA Challenge — Part 414,143May 10, 2021, 11:47 a.m.
Purple 11,082April 23, 2021, 8:27 p.m.
Wheatstone Cryptograph — Part 1200April 21, 2021, 11:31 p.m.
The SIGABA Challenge — Part 314,164April 18, 2021, 10:38 p.m.
Sigaba Part 213,068April 18, 2021, 10:32 p.m.
The SIGABA Challenge — Part 21,152April 17, 2021, 4:43 p.m.
Sigaba Part 11,082April 16, 2021, 6:18 p.m.
The SIGABA Challenge — Part 11,153April 6, 2021, 9:39 a.m.
Double Column Transposition — Part 31,092March 8, 2021, 11:10 p.m.
Breaking a Filter Generator1,122March 7, 2021, 2:14 p.m.
Lightweight Introduction to Lattices — Part 2100March 1, 2021, 6:40 p.m.
New Year's Greetings — Part 4100Feb. 28, 2021, 4:17 p.m.
New Year's Greetings — Part 3100Feb. 28, 2021, 3:44 p.m.
Polyhomophonic Substitution — Part 21,162Feb. 22, 2021, 6:58 p.m.
Polyphonic Substitution Cipher — Part 21,153Feb. 21, 2021, 10:39 p.m.
Polyphonic Substitution Cipher — Part 11,147Feb. 21, 2021, 1:18 p.m.
Pigpen with a twist — Part 31,084Feb. 4, 2021, 11:34 a.m.
M-138 — Part 31,095Jan. 23, 2021, 1:47 p.m.
Handycipher made in love — Part 21,136Jan. 22, 2021, 6:34 p.m.
Handycipher made in love — Part 11,130Jan. 22, 2021, 5:19 p.m.
Image Noise100Jan. 20, 2021, 11:39 p.m.
Number Sequence — Part 7100Jan. 20, 2021, 4:27 p.m.
Find the right route — Part 3107Jan. 9, 2021, 1:39 p.m.
The LoRa Cipher: Logic Randomness — Part 11,164Dec. 29, 2020, 4:24 p.m.
Monoalphabetic Substitution with Nostradamus Flavor1,132Dec. 28, 2020, 5:35 p.m.
Find the right route — Part 2111Dec. 27, 2020, 7:25 p.m.
Find the right route — Part 1102Dec. 27, 2020, 12:57 p.m.
Cipher ID — Part 11,153Dec. 27, 2020, 11:28 a.m.
Lightweight Introduction to Lattices — Part 31,725July 19, 2020, 11:13 a.m.
Polyhomophonic Substitution — Part 1101July 4, 2020, 1:03 p.m.
Lightweight Introduction to Lattices — Part 1102July 2, 2020, 11:25 p.m.
A Cloaked Substitution Cipher — Part 21,252Nov. 8, 2019, 1:51 p.m.
A Cloaked Substitution Cipher — Part 11,262Oct. 25, 2019, 8:45 p.m.
Homophonic Encryption — Part 21,197Oct. 22, 2019, 10:15 p.m.
Homophonic Encryption — Part 41,198Oct. 21, 2019, 7:24 p.m.
Homophonic Encryption — Part 11,197Oct. 21, 2019, 10:10 a.m.
Homophonic Encryption — Part 31,198Oct. 20, 2019, 10:10 p.m.
Cryptanalysis Hacking Puzzles — Part 2100Oct. 19, 2019, 3:54 p.m.
Hilly — Part 21,156Oct. 29, 2018, 9:19 p.m.
Autokey Cipher150Sept. 26, 2018, 8:50 p.m.
Modular Sequences200Sept. 25, 2018, 3:30 p.m.
Hilly — Part 11,139Aug. 7, 2018, 11:17 a.m.
AES ECB Wrong Encoding1,180Aug. 3, 2018, 11:01 a.m.
Advent Challenge — Part 41,181Aug. 2, 2018, 4:48 p.m.
Trendy Messenger1,288July 30, 2018, 4:34 p.m.
Fastest in the West1,288July 30, 2018, 3:10 p.m.
Summer Job1,294July 27, 2018, 3:28 p.m.
The Einstein Enigma1,197July 27, 2018, 2:56 p.m.
Number Sequence — Part 10101July 26, 2018, 5:18 p.m.
Advent Challenge — Part 31,824Dec. 24, 2017, 12:12 p.m.
Advent-Challenge — Part 21,824Dec. 18, 2017, 4:55 p.m.
Advent-Challenge — Part 1133Dec. 11, 2017, 3:18 p.m.
Number Sequence — Part 9108Nov. 29, 2017, 3:59 p.m.
Handycipher — Part 313,977Sept. 13, 2016, 10:59 a.m.
ASAC — A Strong(er) ADFGVX Cipher — Part 11,266Sept. 10, 2016, 8:42 a.m.
Handycipher — Part 21,140Sept. 6, 2016, 10:35 a.m.
Weakened Handycipher — Part 31,152June 24, 2016, 2:59 p.m.
Weakened Handycipher — Part 21,155May 31, 2016, 12:37 p.m.
Weakened Handycipher — Part 11,156May 18, 2016, 1:14 p.m.
Flawed Usage of a OTP Cipher by the BND1,172May 16, 2016, 9:35 a.m.
Spanish Strip Cipher — Part 21,127May 14, 2016, 7:07 p.m.
Spanish Strip Cipher — Part 11,127May 13, 2016, 9:57 p.m.
Zodiac Cipher100May 6, 2016, 7:55 p.m.
Ku Klux Klan1,000May 3, 2016, 5:05 p.m.
Weakened Granit — Part 1101April 9, 2016, 10:31 p.m.
News from Castle Mansfeld101April 8, 2016, 6:38 p.m.
Number Sequence — Part 8100April 3, 2016, 1:38 p.m.
New Year's Greetings — Part 2108April 2, 2016, 6:19 p.m.
New Year's Greetings — Part 1108April 2, 2016, 5:11 p.m.
Heartbleed — Part 31,151Oct. 23, 2015, 1:32 p.m.
Lattice Part 11,102Oct. 17, 2015, 3:34 p.m.
Double Column Transposition — Part 41,146Sept. 6, 2015, 1:03 p.m.
Heartbleed — Part 2100Sept. 1, 2015, 4:38 p.m.
Double Column Transposition — Part 21,145Aug. 31, 2015, 3:27 p.m.
The Last Note100Aug. 31, 2015, 8:29 a.m.
A hidden word — Part 2101Aug. 27, 2015, 2:31 p.m.
Heartbleed — Part 1 100Aug. 27, 2015, 7:06 a.m.
Monoalphabetic substitution with camouflage — Part 21,109Aug. 22, 2015, 11:48 a.m.
Monoalphabetic substitution with camouflage — Part 31,109Aug. 18, 2015, 6:22 p.m.
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 21,104July 23, 2015, 10:07 a.m.
M-138 — Part 21,279Feb. 15, 2015, 8:06 p.m.
M-138 — Part 1102Feb. 12, 2015, 3:29 p.m.
Enigma Messages with Repeated Letters — Part 4101Aug. 31, 2014, 3:18 p.m.
Enigma Messages with Repeated Letters — Part 5200March 6, 2014, 12:13 p.m.
Keyshanc — Part 21,133March 6, 2014, 12:05 p.m.
Enigma Messages with Repeated Letters — Part 3200March 6, 2014, 11:58 a.m.
Pigpen with a twist — Part 21,121March 2, 2014, 6:49 p.m.
Trifid Cipher101Jan. 6, 2014, 3:49 p.m.
CMEA 213,614Jan. 1, 2014, midnight
Lunchtime Attack on the Fully Homomorphic Encryption Scheme1,116Dec. 30, 2013, 6:17 p.m.
A really long number sequence1,124Dec. 30, 2013, 3:30 p.m.
CMEA 11,115Dec. 24, 2013, 5:03 p.m.
Factorization Cipher — Part 21,130Nov. 18, 2013, 10:09 a.m.
RSA with Special d13,613Nov. 13, 2013, 10:14 a.m.
Enigma Messages with Repeated Letters — Part 2200Oct. 29, 2013, 11:32 a.m.
Smartcard RSA1,115Oct. 23, 2013, 5:47 p.m.
Cascading Encryption — Part 3/31,186Oct. 19, 2013, 5:49 p.m.
Enigma Part 21,115Oct. 13, 2013, 11:50 a.m.
Enigma Part 11,115Oct. 8, 2013, 9:13 p.m.
Playfair Encryption100Oct. 4, 2013, 6:02 p.m.
Kaskade-S/T — Part 31,120Oct. 4, 2013, 5:59 p.m.
Music Code — Part 21,123Sept. 28, 2013, 11:59 a.m.
Enigma Messages with Repeated Letters — Part 1200Sept. 26, 2013, 6:21 p.m.
A Secret Message from Castle Mansfeld100Sept. 26, 2013, 2:06 p.m.
Strange Message from Thessaloniki100Sept. 16, 2013, 3:40 p.m.
Cascading Encryption — Part 2/31,195Sept. 14, 2013, 11:30 p.m.
Multilingual Monoalphabetic Substitution100Sept. 10, 2013, 10:07 a.m.
Music Code — Part 1100Sept. 8, 2013, 11:03 a.m.
¿No Hablas Español? No problemo!100Sept. 7, 2013, 4:27 p.m.
From Russia with Love200Sept. 4, 2013, 5:42 p.m.
Monoalphabetic substitution with camouflage — Part 1100Sept. 3, 2013, 7:19 p.m.
Monoalphabetic substitution with camouflage — Part 4100Aug. 13, 2013, 3:19 p.m.
Monoalphabetic Substitution100Aug. 8, 2013, 2:45 p.m.
Nils away on travel200Aug. 8, 2013, 2:39 p.m.
ADFGVX — Part 1100Aug. 7, 2013, 2:48 p.m.
Cascading Encryption — Part 1/3101Aug. 4, 2013, 3:58 p.m.
Snow White and the seven dwarfs101July 29, 2013, 2:59 p.m.
Not-so-Secret Message from Malawi — Part II (ECC)1,118July 17, 2013, 2:15 p.m.
Factorization Cipher — Part 31,139July 15, 2013, 5:09 p.m.
Unusual encryption using a diophantine equation1,132July 14, 2013, 11:38 a.m.
ORYX Stream Cipher Part II1,118July 9, 2013, 2:44 p.m.
Unconcealed RSA messages1,136July 8, 2013, 11:19 a.m.
ORYX Stream Cipher — Part 3 (revised)1,349July 3, 2013, 9:44 a.m.
How do you become a big cryptographer?100March 9, 2013, 12:50 p.m.
Reserve Hand Procedure — Part 1200March 7, 2013, 6:31 p.m.
Enigma Messages103Feb. 23, 2013, 12:29 p.m.
ORYX Stream Cipher Part I1,123Feb. 16, 2013, 9:28 p.m.
Playfair with hints about the grid150Jan. 17, 2013, 11:51 p.m.
Not-so-Secret Message from Malawi — Part I (RSA)1,125Jan. 11, 2013, 11:47 a.m.
A hidden word150Jan. 8, 2013, 11:24 a.m.
Molehunt (Part 3/3)1,126Jan. 3, 2013, 2:25 p.m.
Recycled One-Time Pad103Dec. 23, 2012, 5:38 p.m.
Cracking SHA1-Hashed Passwords1,136Dec. 8, 2012, 5:45 p.m.
The Book Code: A Challenge for Bookworms100Oct. 21, 2012, 1:48 p.m.
Turing Bombe Enigma I100Oct. 20, 2012, 10:16 p.m.
Letter to the Templars — Part 31,660Oct. 13, 2012, 10:56 a.m.
Molehunt (Part 1/3)100Sept. 14, 2012, 4:09 p.m.
Molehunt (Part 2/3)100Sept. 14, 2012, 12:41 p.m.
BCR code (Book-Caesar-RSA)2,000Sept. 13, 2012, 11:06 a.m.
Letter from the Alleged Countess Julie von Ortenburg100Sept. 7, 2012, 6:13 p.m.
Enigma Combinatorics100Sept. 4, 2012, 11:12 a.m.
Kaskade-S/T — Part 21,140Aug. 30, 2012, 3:41 p.m.
Partial Key Exposure with RSA — Part 11,187Aug. 30, 2012, 8:43 a.m.
Post-Quantum Cryptography: Unbalanced Oil and Vinegar System — Part 1100Aug. 29, 2012, 12:17 p.m.
Kaskade-S/T — Part 1100Aug. 25, 2012, 7:40 p.m.
Double Columnar Transposition100Aug. 23, 2012, 11:44 a.m.
Beaver Code200Aug. 14, 2012, 10:19 a.m.
AES key — encoded in the machine readable zone of a European ePassport1,185Aug. 13, 2012, noon
Classical Ciphers^3100Aug. 8, 2012, 9:15 p.m.
A modified homophonic cipher with reduced alphabets — Part 2100Aug. 7, 2012, 8:47 p.m.
A modified homophonic cipher with reduced alphabets — Part 1100Aug. 7, 2012, 1:33 p.m.
Number Sequence — Part 3101Aug. 7, 2012, 9:30 a.m.
Keyshanc — Part 11,256July 31, 2012, 7:41 p.m.
Letter to the Templars — Part 2200July 31, 2012, 10:10 a.m.
Brute-Force-Attack on Triple-DES with Reduced Key Space1,133July 28, 2012, 10:36 a.m.
Hybrid Encryption I1,134July 26, 2012, 9:15 a.m.
ADFGVX — Part 2100July 21, 2012, 7:13 p.m.
One-Time Pad with Flaws100July 21, 2012, 11:32 a.m.
Broadcasting and low exponent — RSA Attack1,157July 19, 2012, 11:28 p.m.
Pigpen with a twist — Part 1100July 18, 2012, 5:05 p.m.
Letter to the Templars — Part 1200July 17, 2012, noon
RSA: Two different keys — same ciphertext1,161July 16, 2012, 4:57 p.m.
Alice's Birthday Party (Part 1)1,134July 13, 2012, 4:11 p.m.
Alice's Birthday Party (Part 2)1,134July 12, 2012, 10:53 a.m.
Grille Cipher100July 11, 2012, 5:53 p.m.
Factorization Cipher — Part 1100July 7, 2012, 1:23 p.m.
ECDH-Key Exchange for Beginners101July 6, 2012, 4:40 p.m.
Modified Caesar Cipher100July 6, 2012, 9:08 a.m.
Number Sequence — Part 5101July 3, 2012, 11:16 p.m.
Caesar Encryption100July 3, 2012, 12:55 p.m.
Original Caesar Cipher100July 2, 2012, 3:57 p.m.
Affine Codes / Modulo Arithmetic with N / Extended Euclid100July 2, 2012, 11:31 a.m.
Number Sequence — Part 4101July 1, 2012, 10:52 p.m.
Number Sequence100June 30, 2012, 4:18 p.m.
Number Sequence — Part 2100June 30, 2012, 4:05 p.m.

Submitted Challenges (1)

LevelNameDate
Hill Cipher with Sudoku KeySept. 4, 2013, 4:27 p.m.

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