Account

Name
Ralf Stephan
Username
rwst
Joined
Oct. 17, 2010, 9:54 a.m.

Rank
82
Points
25,229
Trophies
Gold1
Silver0
Bronze3

Active Challenges (3)

LevelNameAttemptsDate
Nils away on travel1 / 15April 16, 2019, 8:47 a.m.
Partial Key Exposure with RSA — Part 11 / 15June 25, 2012, 10:13 a.m.
Enigma Combinatorics5 / 20Nov. 16, 2010, 11:28 a.m.

Solved Challenges (48)

LevelNamePointsDate
Factorization Cipher — Part 31,090April 17, 2019, 4:12 p.m.
M-138 — Part 21,104April 16, 2019, 6:34 p.m.
M-138 — Part 1100April 16, 2019, 8:39 a.m.
Advent-Challenge — Part 1100April 16, 2019, 7:50 a.m.
Number Sequence — Part 8100April 16, 2019, 7:35 a.m.
Factorization Cipher — Part 21,126Feb. 9, 2014, 10:49 a.m.
Unusual encryption using a diophantine equation1,122Feb. 9, 2014, 8:30 a.m.
From Russia with Love101Feb. 8, 2014, 5:55 p.m.
RSA Factoring Challenge: RSA-7040Aug. 1, 2013, 10:15 a.m.
BCR code (Book-Caesar-RSA)1,163July 31, 2013, 12:34 p.m.
Hybrid Encryption I1,118July 30, 2013, 12:16 p.m.
RSA: Two different keys — same ciphertext1,130July 29, 2013, 10:23 a.m.
How do you become a big cryptographer?100July 27, 2013, 11:36 a.m.
Reserve Hand Procedure — Part 1101July 27, 2013, 9:30 a.m.
Snow White and the seven dwarfs101July 26, 2013, 10:25 a.m.
Grille Cipher100July 15, 2013, 10:26 a.m.
A hidden word101July 10, 2013, 11:54 a.m.
Pigpen with a twist — Part 1100Oct. 20, 2012, 7:46 a.m.
Beaver Code102Oct. 18, 2012, 12:34 p.m.
Letter to the Templars — Part 31,502Oct. 18, 2012, 12:02 p.m.
Letter to the Templars — Part 2101Oct. 18, 2012, 11:42 a.m.
Letter to the Templars — Part 1101Oct. 18, 2012, 11:22 a.m.
Broadcasting and low exponent — RSA Attack1,160July 1, 2012, 11:02 a.m.
Not-so-Secret Message from Malawi — Part I (RSA)1,135June 24, 2012, 5:14 p.m.
Cracking SHA1-Hashed Passwords1,149June 23, 2012, 6:39 p.m.
Modified Caesar Cipher100June 23, 2012, 1:07 p.m.
Affine Codes / Modulo Arithmetic with N / Extended Euclid100June 23, 2012, 11:20 a.m.
One-Time Pad with Flaws100June 23, 2012, 11:04 a.m.
Number Sequence — Part 4102June 23, 2012, 10 a.m.
Number Sequence — Part 3101June 23, 2012, 9:57 a.m.
Factorization Cipher — Part 1101Feb. 17, 2012, 4:43 p.m.
A really long number sequence1,199Feb. 17, 2012, 4:20 p.m.
Number Sequence — Part 2100Feb. 16, 2012, 6:07 p.m.
Original Caesar Cipher106Jan. 1, 2011, 11:35 a.m.
Zodiac Cipher109Oct. 24, 2010, 8:16 p.m.
Enigma Part 21,485Oct. 23, 2010, 5:30 p.m.
A modified homophonic cipher with reduced alphabets — Part 1200Oct. 22, 2010, 10:55 a.m.
A modified homophonic cipher with reduced alphabets — Part 2200Oct. 22, 2010, 10:45 a.m.
Enigma Part 11,523Oct. 22, 2010, 9:32 a.m.
Caesar Encryption200Oct. 22, 2010, 8:58 a.m.
Brute-Force-Attack on Triple-DES with Reduced Key Space1,547Oct. 20, 2010, 7:07 p.m.
Alice's Birthday Party (Part 2)1,613Oct. 19, 2010, 9:52 a.m.
Alice's Birthday Party (Part 1)1,613Oct. 18, 2010, 8:06 p.m.
A Secret Message from Castle Mansfeld120Oct. 18, 2010, 6:16 p.m.
Classical Ciphers^3120Oct. 18, 2010, 4:54 p.m.
Letter from the Alleged Countess Julie von Ortenburg125Oct. 17, 2010, 8:44 p.m.
Monoalphabetic Substitution125Oct. 17, 2010, 5:50 p.m.
Number Sequence133Oct. 17, 2010, 12:04 p.m.

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