Read the summary and the most important questions on Cryptographic Security

• 1 Security and cryptography

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• How does one formulate risk?

  Risk= Likelihood x damage

• How does one formulate likelihood?

  likelihood=  threat x vulnerability

• what are security requirements?

  precise descriptions of acceptable levels of security à should be formulated before security measures are taken.

• What is data integrity?

  the requirement that the data itself is not modified

• 1.5 Kerckhoff's Principle

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• What is Kerckhoff's Principle?

  prescribes that any cryptographic system should stay entirely secure even if it falls into the hands of the enemy. 

• What is proprietary cryptography?

  a secret algorithm

• 1.6 Cryptanalysis

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• What is a Key space exhaustion attack/ brute force attack

  try out the decryption algorithm with all possible keys and see if some outcome produces understandable text --> when the key space is small this is not that hard.

• 2 Symmetric Cryptography

• 2.1 Introduction, bits and bytes

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• What means symmetric cryptography?

  The symmetry refers to the fact that the same key is used to encrypt and decrypt.

• What is a big advantage of symmetric cryptography?

  these systems can be designed with speed in mind: very high performance is possible.

• 3 Asymmetric Cryptography

• 3.1 Introduction: Public Key Encryption

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• What are the advantages of Asymmetric cryptography?

  ·No trusted channel is needed at all
  ·It is very well scalable. The number of keys is not quadratic anymore but linear.