Last Updated
：2025/11/21
substitution cipher
Noun
(cryptography)
A
method
of
encryption
by
which
units
of
plaintext
are
substituted
with
ciphertext
according
to
a
regular
system;
the
"units"
may
be
single
letters
(the
most
common),
pairs
of
letters,
triplets
of
letters,
mixtures
of
the
above,
and
so
forth.
The
receiver
deciphers
the
text
by
performing
an
inverse
substitution.
Japanese Meaning
置換暗号：平文の各単位（単一文字、文字の組み合わせなど）を一定の規則に従って対応する暗号文の単位に置き換える暗号化手法 / 暗号解読：受信者は逆の置換操作を行うことで元の平文を復元できる方式
Sense（1）
(cryptography)
A
method
of
encryption
by
which
units
of
plaintext
are
substituted
with
ciphertext
according
to
a
regular
system;
the
"units"
may
be
single
letters
(the
most
common),
pairs
of
letters,
triplets
of
letters,
mixtures
of
the
above,
and
so
forth.
The
receiver
deciphers
the
text
by
performing
an
inverse
substitution.
（ plural ）
Quizzes for review
(cryptography) A method of encryption by which units of plaintext are substituted with ciphertext according to a regular system; the units
may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by performing an inverse substitution.
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See correct answer
substitution cipher
The archaeologist used a substitution cipher to decode the merchant's ancient letters.
See correct answer
The archaeologist used a substitution cipher to decode the merchant's ancient letters.
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