The mathematician helped crack Nazi Germany’s Enigma encryption machine — a turning point in the war — and is considered a father of modern computing.
Controversy Over Dutch University Cracking Oyster Code
Researchers claim to have broken the electronic security used in the Oyster
card on the London Underground.
The DW-WORLD Article
crack (GET INTO) Show phonetics
1 to break something open, especially in order to reach or use what is inside:
Crack three eggs into a bowl and mix them together.
He cracked (open) the nuts with his hands.
2 to find a solution to a problem:
They cracked the code and read the secret message.
UK I've been trying to solve this problem all week, but I still haven't cracked it.
3 (ALSO crack into sth) to get into someone else's computer system without permission and obtain information or do something illegal
4 INFORMAL to copy computer programs or recorded material illegally
crack Show phonetics
noun [C] INFORMAL
a method of cracking someone else's computer system:
Find cracks for your shareware programs.
crack：動詞，指破解（密碼）、解開（難題等），如They cracked the code and read the secret message.（他們破解了密碼，讀取秘密訊息。）
turn the tide：片語，指造成局勢逆轉，如The government had planned cuts in the armed forces, but when war broke out, the military saw a chance to turn the tide.（政府原打算裁軍，但隨後戰爭爆發，軍方發現了逆轉情勢的機會。）
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Support through a difficult period, as in I asked my brother for $100 to tide me over until payday. This expression alludes to the way the tide carries something. [Early 1800s]