WGU D830 Complete Study Guide, Practice Questions & Answers
WGU D830
Study online at https://quizlet.com/_j66cok
1. Cryptology The study of cryptography
and cryptanalysis togeth-
er.
2. Cryptography The practice of creat-
ing secure communication
systems.
3. Cryptanalysis The practice of breaking
cryptographic systems.
4. Plaintext Original readable data
before encryption.
5. Ciphertext Encrypted, unreadable
data.
6. Key A secret value used to en-
crypt or decrypt data.
7. Cipher An algorithm used for en-
cryption and decryption.
8. Encryption The process of converting
plaintext into ciphertext.
9. Decryption The process of converting
ciphertext back into plain-
text.
10. Kerckhoffs's Principle A cryptosystem should be
secure even if the algo-
rithm is public; only the
key must remain secret.
, WGU D830 Complete Study Guide, Practice Questions & Answers
WGU D830
Study online at https://quizlet.com/_j66cok
11. Symmetric Cryptography A type of encryption where
the same key is used for
encryption and decryp-
tion.
12. Asymmetric Cryptography A type of encryption that
uses a public key and a
private key.
13. Public Key A key that is shared pub-
licly and used to encrypt
data.
14. Private Key A secret key used to de-
crypt data or create digital
signatures.
15. One-Way Function A function that is easy to
compute but difficult to
reverse.
16. Trapdoor Function A one-way function that
can be reversed using se-
cret information.
17. Caesar Cipher A substitution cipher that
shifts letters by a fixed
number.
18. Substitution Cipher A cipher that replaces
plaintext symbols with
other symbols.
, WGU D830 Complete Study Guide, Practice Questions & Answers
WGU D830
Study online at https://quizlet.com/_j66cok
19. Polyalphabetic Cipher A cipher that uses multiple
substitution alphabets.
20. Transposition Cipher A cipher that rearranges
plaintext characters with-
out replacing them.
21. One-Time Pad A cipher that uses a ran-
dom key equal in length
to the message and used
only once.
22. Confusion A property that hides the
relationship between the
key and ciphertext.
23. Diffusion A property that spreads
plaintext influence across
ciphertext.
24. Block Cipher A symmetric cipher that
encrypts fixed-size blocks
of data.
25. Padding Extra bits added to fill a
block when plaintext is too
short.
26. AES (Advanced Encryption Standard) A modern symmetric
block cipher using 128-bit
blocks.
27. DES (Data Encryption Standard) A legacy symmetric block
cipher using 56-bit keys.
WGU D830
Study online at https://quizlet.com/_j66cok
1. Cryptology The study of cryptography
and cryptanalysis togeth-
er.
2. Cryptography The practice of creat-
ing secure communication
systems.
3. Cryptanalysis The practice of breaking
cryptographic systems.
4. Plaintext Original readable data
before encryption.
5. Ciphertext Encrypted, unreadable
data.
6. Key A secret value used to en-
crypt or decrypt data.
7. Cipher An algorithm used for en-
cryption and decryption.
8. Encryption The process of converting
plaintext into ciphertext.
9. Decryption The process of converting
ciphertext back into plain-
text.
10. Kerckhoffs's Principle A cryptosystem should be
secure even if the algo-
rithm is public; only the
key must remain secret.
, WGU D830 Complete Study Guide, Practice Questions & Answers
WGU D830
Study online at https://quizlet.com/_j66cok
11. Symmetric Cryptography A type of encryption where
the same key is used for
encryption and decryp-
tion.
12. Asymmetric Cryptography A type of encryption that
uses a public key and a
private key.
13. Public Key A key that is shared pub-
licly and used to encrypt
data.
14. Private Key A secret key used to de-
crypt data or create digital
signatures.
15. One-Way Function A function that is easy to
compute but difficult to
reverse.
16. Trapdoor Function A one-way function that
can be reversed using se-
cret information.
17. Caesar Cipher A substitution cipher that
shifts letters by a fixed
number.
18. Substitution Cipher A cipher that replaces
plaintext symbols with
other symbols.
, WGU D830 Complete Study Guide, Practice Questions & Answers
WGU D830
Study online at https://quizlet.com/_j66cok
19. Polyalphabetic Cipher A cipher that uses multiple
substitution alphabets.
20. Transposition Cipher A cipher that rearranges
plaintext characters with-
out replacing them.
21. One-Time Pad A cipher that uses a ran-
dom key equal in length
to the message and used
only once.
22. Confusion A property that hides the
relationship between the
key and ciphertext.
23. Diffusion A property that spreads
plaintext influence across
ciphertext.
24. Block Cipher A symmetric cipher that
encrypts fixed-size blocks
of data.
25. Padding Extra bits added to fill a
block when plaintext is too
short.
26. AES (Advanced Encryption Standard) A modern symmetric
block cipher using 128-bit
blocks.
27. DES (Data Encryption Standard) A legacy symmetric block
cipher using 56-bit keys.
