Computer Security Exam 1 with correct
answers
Threat |Vectors |- |correct |answers✔✔1. |Physical
2. |Direct |Network
3. |Virtual
4. |Wireless
5. |Portable |Media |and |Mobile |Devices
CIA |Triad |- |correct |answers✔✔Confidentiality, |Integrity, |Availability
Levels |of |Impact |- |correct |answers✔✔1. |Low |- |limited |adverse |effect
2. |Moderate |- |serious |adverse |effect
3. |High |- |catastrophic |adverse |effect
Active |Attack |- |correct |answers✔✔involves |modification |of |the |data |stream
Passive |Attack |- |correct |answers✔✔eavesdropping |or |monitoring |transmissions
Computer |Security |- |correct |answers✔✔the |protection |afforded |to |an |automated
|information |system |to |preserve |integrity, |availability, |and |confidentiality |of
|information |system |resources
Countermeasure |- |correct |answers✔✔any |means |taken |to |deal |with |a |security
|attack. |Used |to |prevent, |detect, |and |recover.
Symmetric |Encryption |- |correct |answers✔✔technique |using |a |single |key |to |provide
|confidentiality |to |transmitted |and |stored |data
1. |Plaintext
, 2. |Encryption |algorithm
3. |Ciphertext
4. |Secret |key
5. |Decryption |algorithm
Cryptanalysis |- |correct |answers✔✔used |to |attack |symmetric |encryption |and |relies
|on |the |algorithm |and |some |knowledge |of |some |plaintext-ciphertext |pairs
Brute |force |attack |- |correct |answers✔✔used |to |attack |symmetric |encryption |and |is
|done |by |trying |every |possible |key |on |a |piece |of |ciphertext |until |an |intelligible
|message |is |obtained
Data |Encryption |Standard |(DES) |- |correct |answers✔✔Takes |a |64 |bit |plaintext |and
|uses |a |56 |bit |key |to |encrypt. |Key |length |became |an |issue |making |it |less |secure
Triple |DES |(3DES) |- |correct |answers✔✔Involves |repeated |DES |2 |or |3 |times. |This
|makes |keys |of |112 |or |168 |bits. |However, |it |has |sluggish |timing |and |still |has |a |64
|bit |block
Advanced |Encryption |Standard |(AES) |- |correct |answers✔✔Created |due |to |3DES
|drawbacks. |Needed |to |have |security |equal |or |better |than |3DES, |significantly
|improved |efficiency, |and |a |block |length |of |128 |bits |and |key |lengths |of |128, |192,
|and |256 |bits.
Block |Cipher |- |correct |answers✔✔processes |the |input |of |one |block |at |a |time |and
|produces |an |output |block |for |each |input |block
Stream |Cipher |- |correct |answers✔✔encrypts |plain |text |one |byte |at |a |time
|continuously
MAC |- |correct |answers✔✔a |secret |key |used |to |generate |a |small |block |of |data |to
|assure |the |message |isn't |altered, |is |from |the |alleged |sender, |and |includes |a
|sequence |number
answers
Threat |Vectors |- |correct |answers✔✔1. |Physical
2. |Direct |Network
3. |Virtual
4. |Wireless
5. |Portable |Media |and |Mobile |Devices
CIA |Triad |- |correct |answers✔✔Confidentiality, |Integrity, |Availability
Levels |of |Impact |- |correct |answers✔✔1. |Low |- |limited |adverse |effect
2. |Moderate |- |serious |adverse |effect
3. |High |- |catastrophic |adverse |effect
Active |Attack |- |correct |answers✔✔involves |modification |of |the |data |stream
Passive |Attack |- |correct |answers✔✔eavesdropping |or |monitoring |transmissions
Computer |Security |- |correct |answers✔✔the |protection |afforded |to |an |automated
|information |system |to |preserve |integrity, |availability, |and |confidentiality |of
|information |system |resources
Countermeasure |- |correct |answers✔✔any |means |taken |to |deal |with |a |security
|attack. |Used |to |prevent, |detect, |and |recover.
Symmetric |Encryption |- |correct |answers✔✔technique |using |a |single |key |to |provide
|confidentiality |to |transmitted |and |stored |data
1. |Plaintext
, 2. |Encryption |algorithm
3. |Ciphertext
4. |Secret |key
5. |Decryption |algorithm
Cryptanalysis |- |correct |answers✔✔used |to |attack |symmetric |encryption |and |relies
|on |the |algorithm |and |some |knowledge |of |some |plaintext-ciphertext |pairs
Brute |force |attack |- |correct |answers✔✔used |to |attack |symmetric |encryption |and |is
|done |by |trying |every |possible |key |on |a |piece |of |ciphertext |until |an |intelligible
|message |is |obtained
Data |Encryption |Standard |(DES) |- |correct |answers✔✔Takes |a |64 |bit |plaintext |and
|uses |a |56 |bit |key |to |encrypt. |Key |length |became |an |issue |making |it |less |secure
Triple |DES |(3DES) |- |correct |answers✔✔Involves |repeated |DES |2 |or |3 |times. |This
|makes |keys |of |112 |or |168 |bits. |However, |it |has |sluggish |timing |and |still |has |a |64
|bit |block
Advanced |Encryption |Standard |(AES) |- |correct |answers✔✔Created |due |to |3DES
|drawbacks. |Needed |to |have |security |equal |or |better |than |3DES, |significantly
|improved |efficiency, |and |a |block |length |of |128 |bits |and |key |lengths |of |128, |192,
|and |256 |bits.
Block |Cipher |- |correct |answers✔✔processes |the |input |of |one |block |at |a |time |and
|produces |an |output |block |for |each |input |block
Stream |Cipher |- |correct |answers✔✔encrypts |plain |text |one |byte |at |a |time
|continuously
MAC |- |correct |answers✔✔a |secret |key |used |to |generate |a |small |block |of |data |to
|assure |the |message |isn't |altered, |is |from |the |alleged |sender, |and |includes |a
|sequence |number
