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Book 3 SANS 301 Questions and Answers Fully Solved $14.99   Add to cart

Exam (elaborations)

Book 3 SANS 301 Questions and Answers Fully Solved

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Exam of 10 pages for the course SANS at SANS (Book 3 SANS 301)

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  • August 3, 2024
  • 10
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • SANS
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julianah420
Book 3 SANS 301

Cryptography - answerart of private communication in a public environment

not that the definition does not contain the word "encryption"
some cryptographic methods simply hide the message; they don't encipher it in any way

plaintext - answerhuman readable- has not been encrypted.

encryption - answertransform readable to nonreadable.

decryption - answertransform nonreadable back to original readable.

Key - answera numeric value of a given length expressed in bits. The changing part of
the encryption algorithm that you must protect

Keyspace - answerthe range of values that can be used to construct a key given a
particular length.

algorithm - answerpublic knowledge set of rules behind cryptography

cryptanalysis - answerart and science of breaking cryptography

called cryptanalytic attack

Why do you provide cryptography? - answerconfidentiality - information kept private and
secure
integrity - data not modified, deleted or added
availability- systems available to whom requires them
authenticity- providing verification or identities
accountability- assurance by recording identities and activities

nonrepudiation - answerthe person that sent a message cannot deny doing so

steganography - answerthe art and science of hiding information by embedding
messages within other, seemingly harmless messages

today it's hiding messages inside a picture, movie, or similar type of file.

cryptography vs. steganography - answercryptography is scrambled

steganography- hidden

, steghide - answera tool to put text inside of a message

if the message is first encrypted, can it be discovered? - answerno

encryption vs. steganography - answerencryption- provides confidentiality of
communication. it does not provide for secrecy of communication like steganography
does.

using encryption itself- people cannot tell what you are saying but you can tell you are
talking privately.

transposition - answertransposes the order of letters (or of groups of letters or of whole
words in some cases).

it's a type of cryptography.

also known as obfuscation and permutation

Scytale - answerA tool used to perform a transposition cipher, consisting of a cylinder
with a strip of parchment wound around it on which is written a message

means staff in Greek.

another example of transposition

column shift - answeran example of transposition

substitution ciphers - answerreplace the letters of a message using some formula. some
replace letters with other letters.
some replace letters with numbers

monoalphabetic ciphers - answerworks by the simple expediency of replacing the
plaintext alphabet with a ciphertext alphabet. any number of methods for creating the
ciphertext alphabet are employed.

best example if Atbash/ would turn the alphabet backwards. instead of ABC it was ZYX.

Caesar Cipher - answera technique for encryption that shifts the alphabet by some
number of characters. rotates by 3 positions

alphabet is rotated...aka rotational substitution cipher.

ROT 13 - answerRotate all charachters 13 letters through the alphabet ( A becomes N,
B becomes O ... ) - Mono-Alphabet Substitution Cipher

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