cryptographic cypher theme

A technique for secure communication in the presence a third party is featured. A collection of more or less complicated algorithms for encryption. These are strategies for writing messages such that they can only be read by those who know the secret to decoding them.

Examples

Sherlock Holmes and Watson cracked a book cipher in sherlock1x02 "The Blind Banker".

4 total · 4 minor

StoryLevelMotivation
novel: Journey to the Center of the Earth (1867) minor Professor Lidenbrock and Alex broke Arne Saknussemm's variant on a transposition cipher to read the 16th century Icelandic alchemist's encrypted message describing how he'd made it to the center of the Earth and back.
sherlock1x02 minor Holmes and Watson cracked a book cipher.
sherlock3x01 minor Mary received a text in a "skip code" telling her that John has been kidnapped by unknown assailants and would die if he were not rescued in time, along with a coded location.
voy4x18 minor Janeway and Tuvok decoded an encrypted message sent from Allied High Command, and the general principles that make ciphers useful were rudimentarily explained.