FINALS

Question 1

The process of converting the ciphertext message back into plaintext so that it can be readily understood.

Answer 1

Decryption

Question 2

a simple substitution cipher in which letters of an original message (plaintext) are substituted by geometric symbols creating a coded message
(ciphertext).

Answer 2

Pigpen Cipher

Question 3

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.

Answer 3

Caesar Cipher

Question 4

The science concerned with data communication and storage in secure and usually secret form.

Encompasses cryptography and cryptanalysis.

Answer 4

Cryptology

Question 5

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.

Answer 5

Null Cipher

Question 6

An encrypted message without knowing the algorithms and keys used to perform the
encryption.

Answer 6

Ciphertext

Question 7

Greek words kryptos, meaning “hidden”, and graphien, meaning “to write”.

The process of making and using codes to secure the transmission of information.

Answer 7

Cryptography

Question 8

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.

Answer 8

Morse Code

Question 9

Cryptanalysis is the process of obtaining the original message.

Answer 9

Plaintext

Question 10

The process of converting an original message into a form that is unreadable to unauthorized individual.

Answer 10

Encryption

Question 11

Null Cipher

Ciphertext:
WALK IN NEW NAP EARLS ROLLY SWINGS NEVER EVER VAILS ETIQUETTE RIGHTS QUAILS UNICORN IN THIS SHOES

What is the Plaintext?

Answer 11

Plaintext : WINNERS NEVER QUITS

Question 12

Morse Code

– / .. - / -. — .–

What is the Plaintext?

Answer 12

Do It Now

Question 13

Morse Code

Encrypt plaintext:
Yes You Can

Answer 13

-.– . … / -.– — ..- / -.-. .- -.

Question 14

Caesar

Decrypt ciphertext:
rfd yfrf pf lmtwq

K = 5 LEFT

Answer 14

Plaintext: may tama ka ghorl

Question 15

CAESAR

CAESAR
Decrypt the ciphertext, “DOO LV ZHOO” using the key of 3 shift
to the left.

K = 3 LEFT

What is the Plaintext?

Answer 15

Plaintext: ALL IS WELL

Question 16

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?

Answer 16

Plaintext: WHEN IT GETS HARD JUST SLEEP AND REST

Question 17

Null Cipher

Decrypt the ciphertext:

BIG FRY PETS BALL ALIVE ALIGN CYCLONE
FLOAT POT EVER AEGIS
ACHIEVE VALENZUELA STATE ESCAPE

What is the Plaintext?

Answer 17

Plaintext: I REALLY LOVE CATS

Question 18

Caesar Cipher

Decrypt the ciphertext:
Wlsa xli xefpi sj qettmrk.
K = 4 left

Answer 18

Plaintext: Show the table of mapping

Question 19

Morse Code

Decrypt:

.-.. .- -… .- -. / .-.. .- -. –. / -. –. / .-.. .- -… .- -. /

Answer 19

Plaintext: Laban lang ng laban

Question 20

Binary cipher

Decrypt:
01111 01110 00101 10000 01001 00101 00011 00101

Answer 20

Plaintext: One piece

Question 21

Caesar

Encypt plaintext:
Sige nga encrypt mo to

K = 7 RIGHT

Answer 21

Decrypted: Zpnl unh lujyfwa tv av

Question 22

Binary cipher

Ecypt plaintext:
Sana pumasa

Answer 22

Decrypt:
10011 00001 01110 00001 10000 10101 01101 00001 10011 00001

Question 23

Morse Code

Encypt the plaintext.
Every adventure requires a step

Answer 23

. …- . .-. -.– / .- -.. …- . -. - ..- .-. . / .-. . –.- ..- .. .-. . … / .- / … - . .–.

Question 24

Null Cipher

Decrypt cipher:

BOB ANCHOR KITE INTAKE TOOK BOBBY ASIST
KOPI OPPO NERVE ACCESS GOAT INFLUENCE TOMORROW

What is the Plaintext?

Answer 24

Plaintext: BAKIT BA KO NAG IT

Question 25

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

Answer 25

Plaintext: Ako si batong bakal mapagmahal