暗

assassination

pitch-dark

light and darkness

implicitly

code

reef

darkness

darkness

tacit

dark clouds

dim

personal identification number

suspicion will raise bogies

memorization

(theatrical) blackout

hint

secret feud

in the dark

prostitute working in clandestine brothel (Edo period)

to lose hope

memorization power

to decide the outcome (e.g. game)

to feel gloomy

shadow cast by a person's hand

secret manoeuvres (maneuvers)

prostitute

dusky

dimness

to lose hope

(looking) very bleak

coincidence

encryption

link-by-link encipherment

Encrypting File System

end-to-end encryption

dark side (of nature, town, etc.)

cryptographic synchronization

encryption

cryptography

cryptography

darkness under the trees

shade under a tree in full leaf

to be shrouded by darkness

a work or subject to be memorized (memorised)

shady

implied expression

cryptogram

cryptography

cryptography

rote memorization (memorisation)

three concealed pungs

scotoma

assassination

assassin

(both) the bright and dark sides

Dark Ages

implicit declaration

cryptography

four concealed triplets (yakuman)

shadowy past

dark place

political assassination

crypto-assets

dark current

scotopic vision

encryption key

cryptographic system

encrypted mail

pairing-based cryptography

cryptographic algorithm

undercurrent

concealed pung

code

pass phrase

Data Encryption Standard

dark figure (esp. of crime)

suggestive therapy

cipher-key

dead of night

secret language

implied addressing

night vision

night-vision scope

it's always darkest before the dawn

eclipse period (in viral lifecycle)

encryption technology

cryptography

to drive black hogs in the dark

cryptographic checkvalue

A Dark Night's Passing (novel by Shiga Naoya)

autosuggestion

cool, dark place

darkroom

terminator

dark space

Dark Continent (i.e. Africa)

dark

dark line (in a spectrum)

transposition cipher

dark adaptation

shadow

(clandestine) brothel (Edo period)

concealed weapon

the dark side

twin propellers

assassination of US President John F. Kennedy (November 22, 1963)

cryptocurrency

substitution cipher

dark-natured

genetic code

assassination of US President John F. Kennedy (November 22, 1963)

body part encryption indication

dark colour

night-vision device

giving an amorous sidelong look

dark matter

groping in the dark

cryptanalysis

dark energy

behind-the-scenes maneuvering

dark red

it is darkest under the lamp post

conventional cryptosystem

conventional cryptosystem

implicit addressing

beautiful scenery of spring

book cipher

concealed pung

foolish ruler

end-to-end encryption

end-to-end encipherment

implicit link (process definition)

understood subject

scent of a flower floating about in the air

implicit

quantum-resistant cryptography

total (utter) darkness

indiscriminate learning by heart

secretly

blackout curtain

cold dark matter

posthypnotic suggestion

darkness

dim

darkness

dark

secretly

darkness

dark clouds gather

suspicion begets monsters