What is the internal structure of DES?

What is the process of converting encrypted data back to its original form in DES called?

What is the key length of DES?

What is the main concern regarding the security of DES?

What is the algorithm of ceasar's cipher?

What is symmetric encryption?

The process of converting plaintext to ciphertext.

A string of text that has been converted to a secure form using encryption.

hello has been encrypted with Caesar cipher to khoor. The key used was:

Consider the process of encoding and decoding a message using the following Caesar cipher encoding scheme in which the plaintext and ciphertext alphabets are offset by four positions, as shown below:

^{Plaintext: a b c d e f g h i j k l m n o p q r s t u v w x y z}

^{Ciphertext: w x y z a b c d e f g h i j k l m n o p q r s t u v}

Which of the following encoded ciphertext strings decodes to an original plaintext message of "secret"?

What is encryption?

What do you call the algorithm used to encrypt data?

What do we call scrambled, encrypted data?

What do we call unscrambled, readable data?

Who used the Caesar Cipher?

Who worked out how to break the German Enigma code?

Which engineer designed and built Colossus, the Lorenz cipher cracking computer?

Which two fictional characters are used to describe encryption scenarios and algorithms?

Which protocol should you use if shopping online?

Which of these do you need to keep secret?

Encryption converts plain text into cipher text.

Encryption requires an encryption algorithm that must be secret.

The same key used to encrypt must be used to decrypt.

Asymmetric encryption begins with a receiver having a public key and a private key.

An individual can have many public keys.

Match each word with the correct explanation.

Nothing should happen to prevent the receiver from receiving the transmission.

Match each word with the correct explanation.

Only the intended recipient should be able to decrypt the ciphertext.

Match each word with the correct explanation.

The receiver must be certain who sent the ciphertext.

Match each word with the correct explanation.

Neither sender nor receiver should be

able to deny involvement in the transmission.

Match each word with the correct explanation.

The ciphertext must not be modified

during transmission

AES uses a key size of __________ bits.

Like DES, AES also uses Feistel Structure.

How many rounds does the AES-192 perform?

Amongst which of the following is / are true with reference to the rounds in AES –

The process of decryption of an AES ciphertext is similar to the encryption process in the ______.

AES uses a blocking size of?

The acronym AES stands for?

Which algorithm among - MARS, Blowfish, RC6 and Rijndael - was chosen as the AES algorithm?

The 4×4 byte matrices in the AES algorithm are called

The word 'encryption' means to ----------- a message so that no one else can understand it.

The word---------- means to unscramble a message so that it makes sense again.

The original message is sometimes called--------- , and the encrypted message is sometimes called------------

The is a special value used in encryption. Knowing this value should make it easy to decrypt a message. Not knowing it should make it very difficult.

_____ is a type of encryption. Knowing which ______ was used is essential if you want to turn it back into a readable message.

True or false? The Atbash Cipher uses a key, which the person receiving the message must use to decrypt it.

True or false? When using the Atbash Cipher, the letters of the alphabet are written out twice, once forwards and once backwards.

Encrypt this plaintext message: BACK

Decrypt this ciphertext message: HKRVH

True or false? The Caesar Cipher uses a key which the person receiving the message must use to decrypt it.

True or false? When using the Caesar Cipher the letters in the ciphertext row should be shifted to the right

Use the Caesar Cipher with Key 1 to encrypt this plaintext message: CODES

Use the Caesar Cipher with Key 3 to decrypt this ciphertext message: HDVLOB

DES follows

Data Encryption Standard (DES) uses a __________.

In the DES algorithm, although the key size is 64 bits only 48bits are used for the encryption procedure, the rest are parity bits.

In the DES algorithm the round key is __________ bit and the Round Input is ____________bits.

In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via ____________

The number of unique substitution boxes in DES after the 48 bit XOR operation are

In the DES algorithm the 64 bit key input is shortened to 56 bits by ignoring every 4th bit.

"Technique of combining words to hide information "

What is the above statement referring to?

In cryptography, plaintext is also known as

Using cryptography techniques, plaintext is converted to

The method of hiding the actual meaning of plaintext is called

The method of the meaning of ciphertext is recovered is called

Who is the person that used cryptography in sending message to his generals?

Method of encrypting text is known as

The two types of cipher are

Using table above for Caesar Cipher, convert the plaintext "GORENG" to ciphertext

Using table above for Caesar Cipher, convert the plaintext "DUDUK" to ciphertext

Encrypted text that will appear to be a random string.

It is a value that is known to the sender.

It is also called as private key cryptography.

It is a science that applies complex

mathematics and logic to design strong encryption

methods.

It is pair of algorithms that take a key and convert plaintext to ciphertext and

back.

The original message in its original legible form.

One key is used for data encryption and another for data decryption.

In hardware-based cryptography, it is dependent on the operating system.

In software-based cryptography, it uses shared hardware, thus slower to execute.

In software-based cryptography, software implementations can be easily reverse engineered.

It is a method used in telecommunication to encode text characters as standardized sequences of two different signal durations, called dots and dashes or dits and dahs.