gabriel-messas/computer-science-information-repository

Repository containing information about various and diverse topics throughout the universe of Computer Science

Computer Science Information Repository (CSIR)

Repository containing information about various and diverse topics throughout the universe of Computer Science

• Security

  • Criptography

    • Perfect Secrecy

      • Using the same key, the probability of a message M0, when encrypted, being the cyphertext C is the same as the probability that another message M1, when encrypted, is the cyphertext C.

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      • The probability of a given message being X, considering that the cyphertext is Y, is the same as the probability of a given message being X.

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      • The key should be, at least, as long as the message and be used uniquely with a probability 1/|K| where |K| is the key space.

      • An example of this concept is the One-Time Pad (OTP) cipher.

    • Diffusion

      • Spreading statistical structural characteristics of the plaintext throughout the ciphertext.

    • Confusion

      • Making the relationship between the ciphertext and the key way too complex to be discovered.