advancedsubstitutioncipher
nounUK /ədˈvɑːnst ˌsʌbstɪˈtjuːʃən ˈsaɪfə/
US /ədˈvænst ˌsʌbstɪˈtuːʃən ˈsaɪfər/
A secret code that swaps each letter for another letter in a tricky way.
The spy used an advanced substitution cipher to hide the message from enemies.
RELATED WORDS
OTHER MEANINGS
2. A substitution cipher that uses multiple alphabets or shifting rules to make decoding harder.
The puzzle used an advanced substitution cipher with a different alphabet for each word.
3. A polyalphabetic cipher in which letter replacements change according to position or a keyword.
Breaking the advanced substitution cipher required knowing the repeating keyword.
4. Any letter-replacement code strengthened with extra steps such as transposition or nulls.
The agent added random letters to the advanced substitution cipher to confuse codebreakers.