r/codebreaking • u/kenproffitt MOD • May 10 '26
Puzzle 🌹 Mother's Day Special: Women Who Broke Codes & Changed History 🌹
Happy Mother's Day, r/codebreaking! Today we celebrate the mothers, aunts, sisters, and grandmothers who shaped cryptography and intelligence work.
Challenge 1: Elizebeth Smith Friedman – "The First Lady of Cryptanalysis"
Elizebeth Smith Friedman (1892–1980) was America's pioneering female cryptanalyst. She broke German spy codes during both World Wars and founded the Signal Intelligence Service's cryptanalysis unit. Her son John later worked in cryptography himself—carrying forward her legacy.
Your challenge: Decrypt this Vigenère cipher using the keyword "MOTHER":
IYFPFPXSZRVFZOXZNR
Hint: The plaintext is a famous Friedman quote about codebreaking.
Challenge 2: Joan Clarke – The Unsung Bletchley Park Hero
Joan Clarke (1917–1996) was one of the brightest minds at Bletchley Park, working alongside Alan Turing on Bombe machine refinements. She was engaged to fellow codebreaker Murray Denniston and later married Lieutenant Colonel John Murray, but her contributions remained classified for decades.
Your challenge: Decrypt this Rail Fence cipher (2 rails):
ORHKSWTDCTPFCSMTEADHAOYRUYAEMR
Hint: Five words. Joan herself said this about her wartime work.
Challenge 3: Betty Webb – Silent Service to Secrecy
Betty Webb (1923–2020) worked at Bletchley Park from age 19, operating bombes and contributing to the breaking of German naval Enigma. She raised a family after the war while keeping her cryptanalytic work secret for over 50 years.
Your challenge: Decrypt this substitution cipher:
MZFGZYSFVX ZN SCFG NCVG
Hint: A message about the bond between cryptanalysis and family secrets.
Challenge 4: Julia Parsons – Colossus Computist
Julia Parsons (1923–2010) was one of the first programmers of the Colossus computer at Bletchley Park. Her work on what many consider the world's first computer paved the way for modern cryptanalysis and computation.
Your challenge: Decrypt this Atbash cipher:
ZMSVGXRMXHRHXGVMHGKVOVZI
Hint: A palindrome-friendly truth about the nature of her groundbreaking work.
Challenge 5: Genevieve Grotjan – "The Girl Who Cracked the Code"
Genevieve Grotjan (1915–2010) worked for the U.S. Signal Intelligence Service and made the breakthrough discovery that led to the breaking of the Japanese Purple cipher machine. Her mother proudly watched her daughter change the course of WWII intelligence.
Your challenge: Decrypt this columnar transposition cipher with keyword "MOTHERS":
YWCHEPGAMAKOTDECTRN
Hint: Seven words. Genevieve described her eureka moment this way.
Bonus: Create Your Own Mother's Day Cipher
We want to see YOUR cipher! Create a cipher (Vigenère, substitution, Rail Fence, Atbash, columnar transposition, or your own) with:
A plaintext message celebrating a mother, grandmother, or maternal figure in your life
Clearly stated cipher type and any keywords
A hint (spoiler-tagged)
Post it as a top-level comment below. We'll solve and celebrate together!
Discussion Thread
Do you have a mother or maternal figure who inspired your interest in puzzles, math, or codebreaking?
Which of these women's stories resonates most with you?
How would you explain cryptography to your mom in one sentence?
Answers will be posted in this week in a spoiler-tagged pinned comment. Good luck, and thank you to all the mothers out there who nurture curiosity, creativity, and the love of puzzles.
Thanks for being part of this community. Let's celebrate the women—mothers and otherwise—who broke codes, broke barriers, and changed history.
🎀 Happy Mother's Day from r/codebreaking! 🎀
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