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Illustration of "Cryptology"

Cryptology embraces two branche: Cryptanalysis & Cryptography

6 mains concepts of cryptography:

  • Confidentiality/Secrecy: Only the destination can read the message
  • Authentication: The destination can be sure the message is sent by the sender
  • Integrity: The message cannot be changed during the transmission
  • Source nonrepudiation: The source cannot deny sending the message
  • Destination nonrepudiation: The destination cannot deny receiving the message
  • Signatures: Third parties can be sure that the message is sent by the sender
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Illustration of "Number, bases. How to convert decimal, hexadecimal and binary ?"


A base is a set of symbols (digits) that can be used to represent a value (number).

  • Decimal base = 0 1 2 3 4 5 6 7 8 9
  • Hexadecimal base = 0 1 2 3 4 5 6 7 8 9 A B C D E F (a = 10, b = 11, ...)

The significance of each digit depends on its position (power of N, where N is the number of digits in the base).

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Illustration of "Data security"


Security is Confidentiality, Integrity, Availability, Authentication, Nonrepudiation.

The assets must be protected (Physical support, Files, Software). Furthermore, network must be secured too because the data must be protected during the transmission itself.

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57 posts found