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A substitution cipher is a type of cipher that changes one character or symbol into another consistently across the entire message.

Conditions: The cipher operates on characters or symbols.; The replacement rule is applied to all instances of a given character within the message.

A substitution cipher is a type of cipher that changes one character or symbol into another consistently across the entire message.

Conditions: The cipher operates on characters or symbols.; The replacement rule is applied to all instances of a given character within the message.

A block cipher is a type of cipher that groups bits into blocks of plaintext before applying the encryption, adding complexity by operating on these blocks rather than individual characters.

Conditions: The cipher operates on grouped bits or blocks of plaintext.; The encryption is applied to the blocks.

A block cipher is a type of cipher that groups bits into blocks of plaintext before applying the encryption, adding complexity by operating on these blocks rather than individual characters.

Conditions: The cipher operates on grouped bits or blocks of plaintext.; The encryption is applied to the blocks.