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InfoSec

Upma Sharma 62 preguntas

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Preguntas del test (62)

  1. 1Cryptography: the process of making and using codes to secure information. Beyond confidentiality concerns, integrity checking, sender/receiver identity authentication, digital signatures involved.
    1. AVerdadero
    2. BFalso
  2. 2Cryptanalysis: the process of obtaining the plaintext message (decrypt) from a ciphertext (encrypted) message without knowing the keys used to perform the encryption.
    1. AVerdadero
    2. BFalso
  3. 3cipher - algorithm for transforming plaintext into ciphertext, and vice versa
    key - info used in cipher known only to sender and/or receiver
    1. AVerdadero
    2. BFalso
  4. 4Typical Threats Cryptography can help with are:
    1. AFabrication (Authenticity Attack) – unauthorized assumption of other's identity
    2. BInterference (Integrity Attack) - inserting bogus message, corrupting messages
    3. CEavesdropping (Attack on Confidentiality) – unauthorized access to information
    4. DRepudiation(Attack on Integrity of information) - unauthorized insertion of corrupted data.
  5. 5Symmetric cipher:
    1. AA single key is used for both encryption and decryption
    2. BBlock cipher: encrypts a block of plaintext at a time (typically 128 bits)
    3. CStream cipher: encrypts data one bit or one byte at a time
    4. DDifferent keys are used for encryption and decryption simultaneously.
    5. ESender and recipient share a common key and must agree on a key before they communicate securely
    6. FSecurity lies with the key
  6. 6Asymmetric Cipher
    Different keys are used for encryption and decryption
    1. AVerdadero
    2. BFalso
  7. 7Main Requirements of ciphers
    1. AConfusion – interceptor cannot predict what will happen to the ciphertext by changing one character in the plaintext. E.g. Substitution cipher: replacing each element of the plaintext with another element.
    2. BDiffusion – information from single plaintext is distributed over the entire ciphertext. Transposition (or permutation) cipher: rearranging the order of the elements of the plaintext.
    3. CTransfusion interceptor cannot predict what will happen to the ciphertext by changing one character in the plaintext.
  8. 8Earliest known confusion cipher. 3 letter alphabet shift. Caesar cipher. Letters can also be mapped to numbers. a = 0 z = 25. Vulnerable to brute force attacks.
    1. AVerdadero
    2. BFalso
  9. 9Choose all cipher techniques:
    1. AMonoalphabetic Substitution cipher: Shuffle the letters and map each plaintext letter to a different random ciphertext letter.
    2. BPolyalphabetic cipher
    3. CVigenère cipher: Matrix of 26x26 alphabet letters shifted.
    4. DBook based cipher: Sherlock Holmes style (page, number, key)
    5. EAnalytic cipher: analyze components of book and mono alphabetic symbols
    6. FRow Transposition ciphers: plain text written row by row. Columns are on cipher.
  10. 10Cryptanalysis is the study of ciphers, ciphertext, or cryptosystems with a view to finding weaknesses in them that will permit retrieval of the plaintext from the ciphertext, without necessarily knowing the key or the algorithm. Two types: brute force, cryptanalytic attack.
    1. AVerdadero
    2. BFalso

Información

Descripción
Test sobre InfoSec, creado por Upma Sharma el 31/10/2018.
Idioma
English
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