FINALS Flashcards
The process of converting the ciphertext message back into plaintext so that it can be readily understood.
Decryption
a simple substitution cipher in which letters of an original message (plaintext) are substituted by geometric symbols creating a coded message
(ciphertext).
Pigpen Cipher
also known as the shift cipher, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.
Caesar Cipher
The science concerned with data communication and storage in secure and usually secret form.
Encompasses cryptography and cryptanalysis.
Cryptology
also known as concealment cipher, is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material.
Today it is regarded as a simple form of steganography, which can be used to hide ciphertext.
Null Cipher
An encrypted message without knowing the algorithms and keys used to perform the
encryption.
Ciphertext
Greek words kryptos, meaning “hidden”, and graphien, meaning “to write”.
The process of making and using codes to secure the transmission of information.
Cryptography
a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dash.
Morse Code
Cryptanalysis is the process of obtaining the original message.
Plaintext
The process of converting an original message into a form that is unreadable to unauthorized individual.
Encryption
Null Cipher
Ciphertext:
WALK IN NEW NAP EARLS ROLLY SWINGS NEVER EVER VAILS ETIQUETTE RIGHTS QUAILS UNICORN IN THIS SHOES
What is the Plaintext?
Plaintext : WINNERS NEVER QUITS
Morse Code
– / .. - / -. — .–
What is the Plaintext?
Do It Now
Morse Code
Encrypt plaintext:
Yes You Can
-.– . … / -.– — ..- / -.-. .- -.
Caesar
Decrypt ciphertext:
rfd yfrf pf lmtwq
K = 5 LEFT
Plaintext: may tama ka ghorl
CAESAR
CAESAR
Decrypt the ciphertext, “DOO LV ZHOO” using the key of 3 shift
to the left.
K = 3 LEFT
What is the Plaintext?
Plaintext: ALL IS WELL
Rail Fence Cipher
W I T R S E N S
H N T E S A D U T L E A D E T
E G H J S P R
What is the Plaintext?
Plaintext: WHEN IT GETS HARD JUST SLEEP AND REST
Null Cipher
Decrypt the ciphertext:
BIG FRY PETS BALL ALIVE ALIGN CYCLONE
FLOAT POT EVER AEGIS
ACHIEVE VALENZUELA STATE ESCAPE
What is the Plaintext?
Plaintext: I REALLY LOVE CATS
Caesar Cipher
Decrypt the ciphertext:
Wlsa xli xefpi sj qettmrk.
K = 4 left
Plaintext: Show the table of mapping
Morse Code
Decrypt:
.-.. .- -… .- -. / .-.. .- -. –. / -. –. / .-.. .- -… .- -. /
Plaintext: Laban lang ng laban
Binary cipher
Decrypt:
01111 01110 00101 10000 01001 00101 00011 00101
Plaintext: One piece
Caesar
Encypt plaintext:
Sige nga encrypt mo to
K = 7 RIGHT
Decrypted: Zpnl unh lujyfwa tv av
Binary cipher
Ecypt plaintext:
Sana pumasa
Decrypt:
10011 00001 01110 00001 10000 10101 01101 00001 10011 00001
Morse Code
Encypt the plaintext.
Every adventure requires a step
. …- . .-. -.– / .- -.. …- . -. - ..- .-. . / .-. . –.- ..- .. .-. . … / .- / … - . .–.
Null Cipher
Decrypt cipher:
BOB ANCHOR KITE INTAKE TOOK BOBBY ASIST
KOPI OPPO NERVE ACCESS GOAT INFLUENCE TOMORROW
What is the Plaintext?
Plaintext: BAKIT BA KO NAG IT
Rail Fence cipher
Decrypt cipher:
A I O A M G A
K S B T N B K L A A M H L
O A G A P A
Plaintext: Ako si batong bakal mapagmahal
