英和和英

secret documents―confidential despatches

confidential papers

write in cipher

to cipher a message

enclosed documents

a unit used for gene information, called codon

Please don't encrypt your file.

the structure of a secret code

a cipher-key

break the code

to decipher a code

break a code

in a cryptographic manner

in cipher

a cryptograph

a cryptogram

a line of business dealing with secret codes

Crack a code

a scrap-book

a bundle of papers

a code called Playfair cipher

a spelling-book

a speller

a password

a password

the charge for registration

seal the letter

clean copy

cursive script

a message written in code