IT Sicherheit at RWTH Aachen

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How to generate RSA public Key

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Describe En- and De-cryption from RSA

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name the 5 types of Knowledge of the Attacker
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What is System correctness

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What does CA mean?

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What does the KDC consist of?

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What is a cryptographic hash function
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What are the Advantages of CBC

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How to generate private RSA Key

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What does MAC stand for?

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What is the meaning of CIA
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explain the differences between Security Mechanism and Security Service

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Exemplary flashcards for IT Sicherheit at the RWTH Aachen on StudySmarter:

IT Sicherheit

How to generate RSA public Key
  • choose two prime numbers p,q
  • campute n = p,q
  • Choose e invertible mod phi(n)
    • phi(n) := number of integers relativ prime to n
  • public key (n,e)

IT Sicherheit

Describe En- and De-cryption from RSA
Encription
  • c=m^e mod n
Decyption
  • m=c^d mod n

IT Sicherheit

name the 5 types of Knowledge of the Attacker
  • Ciphertext-only
  • known plaintext (some p-c-pairs)
  • Chosen-plaintext (get c for p of choice)
  • Chosen ciphertext (get p for c of choice)
  • Adaptiv chosen-cipher (decrypt any c, depending on target and result of prev. cipher)

IT Sicherheit

What is System correctness
system reakt as expected, for reasonable input, get reasonable output

IT Sicherheit

What does CA mean?
certification authority

IT Sicherheit

What does the KDC consist of?

  • Kerberos Authentication Server (as)
  • Kerberos ticket granting server (TGS)

IT Sicherheit

What is a cryptographic hash function
a hash function which is preimage resistant and collision resistant

IT Sicherheit

What are the Advantages of CBC
Chiper block chaining
  1. deletion of cipher detection
  2. Re-ordering of cipher detection
  3. Self-synchronizing on transmission error 

IT Sicherheit

How to generate private RSA Key
given p, q, n, e from public key generation

find d with ed = 1 mod phi(n)
d is private key

IT Sicherheit

What does MAC stand for?
Message Authentication Code

IT Sicherheit

What is the meaning of CIA
Confidentiality (only authorized entities get information)
Intercity (Konsistenz der Daten. Keine wiedersprüche/Datenverlust oder änderung)
Availability (data and service needs to be available to autohrized entities)

IT Sicherheit

explain the differences between Security Mechanism and Security Service
A mechanism is designed to detect, prevent or recover from an attack
Security services make use of these mechanisms to enhance the security of data systems and information

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