D830 Practice Test Question with Verified
Correct Answers
[2.0]
[2.3] Cryptosystem
- The art, techniques, and science of concealing the data and messages to include secrecies,
which protect data and messages from unwanted usages
[2.3] Cryptoanalysis
- The science and technique of analyzing and breaking cryptographic algorithms and
protocols.
[2.3] Cryptology
- The discipline or cryptography and cryptanalysis combined.
[2.3] Ancient Egypt
- The earliest known encrypted text (1900 BC)
- Hieroglyphics
[2.3] Greece
- 500 BC
- Use of a baton (scytale)
[2.3] Rome
- Used the Caesar's Cipher
[2.3] Vigenère's Cipher
,- 1500s
- A 26-by-26 table used to substitute letters
- Prevents same letter from being replaced by the same letter
- Base concept of polyalphabetic ciphers
[2.3] Jefferson's Wheel Cipher
- Composed of 36 disks (or wells), stacked on top of each other around an axle. The 26 Latin
letters are randomly inscribed on each disk. The disks are numbered; they are removable and
can be mounted on the axle in any desired order. The order of disk mounting represents the
secret key.
[2.3] Plaintext
- The data either on a storage device or in transit over a communication network
[2.3] Ciphertext
- The data after encryption
- Not readable without the possession of the decryption key
[2.3] Cryptographic Key (Secret Key)
- A parameter used by encryption and decryption algorithms
[2.3] Static Key
- Intended to be used for a long period of time
[2.3] Ephemeral Key
- Used for a very limited time
[2.3] Encryption Algorithm
, - The process of creating a ciphertext
- Makes use of a key to scramble the input so that the result looks like a noise
[2.3] Decryption Algorithm
- The process of transforming a ciphertext into a plaintext
[2.3] Encryption Key
- The secret value that is known to the sender
[2.3] Decryption Key
- The secret value that is known to the receiver
- Related to the encryption key
[2.3] Symmetric Cryptography Challenges
- Key establishment
- Trust
[2.3] Symmetric-key algorithms advantages
- Faster than asymmetric-key algorithms
- key length shorter for the same security strength
- based on simple bit operations (substitutions, XORing, shifting, swapping)
[2.3] Asymmetric-key algorithms advantages
- based on modular arithmetic and operations over finite fields
- increased security of private keys
- provides digital signatures for authentication
- digital certificates and signatures for non-repudiation
[2.3] Asymmetric Cryptography Classes
Correct Answers
[2.0]
[2.3] Cryptosystem
- The art, techniques, and science of concealing the data and messages to include secrecies,
which protect data and messages from unwanted usages
[2.3] Cryptoanalysis
- The science and technique of analyzing and breaking cryptographic algorithms and
protocols.
[2.3] Cryptology
- The discipline or cryptography and cryptanalysis combined.
[2.3] Ancient Egypt
- The earliest known encrypted text (1900 BC)
- Hieroglyphics
[2.3] Greece
- 500 BC
- Use of a baton (scytale)
[2.3] Rome
- Used the Caesar's Cipher
[2.3] Vigenère's Cipher
,- 1500s
- A 26-by-26 table used to substitute letters
- Prevents same letter from being replaced by the same letter
- Base concept of polyalphabetic ciphers
[2.3] Jefferson's Wheel Cipher
- Composed of 36 disks (or wells), stacked on top of each other around an axle. The 26 Latin
letters are randomly inscribed on each disk. The disks are numbered; they are removable and
can be mounted on the axle in any desired order. The order of disk mounting represents the
secret key.
[2.3] Plaintext
- The data either on a storage device or in transit over a communication network
[2.3] Ciphertext
- The data after encryption
- Not readable without the possession of the decryption key
[2.3] Cryptographic Key (Secret Key)
- A parameter used by encryption and decryption algorithms
[2.3] Static Key
- Intended to be used for a long period of time
[2.3] Ephemeral Key
- Used for a very limited time
[2.3] Encryption Algorithm
, - The process of creating a ciphertext
- Makes use of a key to scramble the input so that the result looks like a noise
[2.3] Decryption Algorithm
- The process of transforming a ciphertext into a plaintext
[2.3] Encryption Key
- The secret value that is known to the sender
[2.3] Decryption Key
- The secret value that is known to the receiver
- Related to the encryption key
[2.3] Symmetric Cryptography Challenges
- Key establishment
- Trust
[2.3] Symmetric-key algorithms advantages
- Faster than asymmetric-key algorithms
- key length shorter for the same security strength
- based on simple bit operations (substitutions, XORing, shifting, swapping)
[2.3] Asymmetric-key algorithms advantages
- based on modular arithmetic and operations over finite fields
- increased security of private keys
- provides digital signatures for authentication
- digital certificates and signatures for non-repudiation
[2.3] Asymmetric Cryptography Classes
