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Concepts

59 concepts

The ideas the research turns on, defined in the site's own words, with every answer and method that uses them.

Cryptography
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Clear
AllABCDEFGHIJKLMNOPQRSTUVWXYZ#

C 1

C
CribA piece of plaintext known or guessed to sit at a particular place in a cipher text.

F 1

FA
Frequency analysisReading a cipher by counting how often each sign appears and matching the counts to a language.

G 1

GC
Gromark cipherA cipher that shifts each letter by a running numeric key made from a short seed.

H 1

HS
Homophonic substitutionA cipher in which one plaintext letter can be written as any of several cipher signs.

K 1

KA
Keyed alphabetA cipher alphabet that starts with a key word and continues with the letters not yet used.

N 1

N
NomenclatorA cipher that pairs a substitution alphabet with a list of code groups for whole words and names.

R 1

RC
Running-key cipherA polyalphabetic cipher whose key is a long text rather than a repeating word.

S 1

S
SteganographyHiding a message so that nobody knows there is one, as distinct from making it unreadable.

T 1

TC
Transposition cipherA cipher that keeps the plaintext's letters and changes their order.

V 1

VC
Vigenère cipherA substitution cipher that shifts each letter by a key word's letters in turn.