The message written in secret code was decipherable by using a cipher key.
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Decipherable literally means something that's is able to be deciphered (decoded, unravelled, found out etc.)
The German's had sent the message in code, but it turned out to be easily decipherable by the Army's cryptologists.
The professor had made sure his notes would only be decipherable by him and his son, as they had created the secret code together.
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How bad High School Musical is.
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OSH software does not return any easily decipherable or clear
results on Google. From what was observed, OSH Software MAY be
dealing with occupational health and safety interfaces and
tools.
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The military utilized Navajo men who fashioned a secret code
from their ancient Navejo language to relay messages of vital
importance to the war effort. Navajo language was not decipherable
to enemy