decrypt
verb [ T ]
uk/dɪˈkrɪpt/ us IT
to change electronic information that was written in code (= a system of letters, numbers, or symbols) back into a form that you can understand and use normally:
The main element of the new software is the creation of a pair of numbers that work like keys to encrypt or decrypt data.
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encrypt
decryption
noun [ C or U ]
a decryption key/program
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encryption