Kontakt a konzultačné hodiny

adresa: Katedra informatiky, FMFI UK, Mlynská dolina, 842 48 Bratislava
miestnosť: M-214
e-mail: stanek@dcs.fmph.uniba.sk
telefón: (+421 2) 60295 101

Konzultačné hodiny: dohodou

Výuka ZS 2023/24

Diplomový seminár (3) (Str 11:30-13:00 M-III)

Kryptológia 1 / Cryptology 1 (Str 16:30-18:00 M-I, Štv 14:00-15:30 M-I)

Lectures:

  1. When, How, and What - pdf, Introduction: Context and Basic Notions - pdf
  2. Cryptanalysis of Classical Ciphers - pdf
  3. Block Ciphers - pdf
  4. Block Ciphers 2 - pdf
  5. Hash Functions - pdf
  6. Message Authentication Codes - pdf (-)

Homework assignments (students):

  1. Find the plaintext (English text) for given ciphertext. We use a transposition cipher on 10 x 10 grid (a torus) that arranges plaintext characters in a spiral. A starting position, initial direction and spin (clockwise or anti-clockwise) are part of the key. Final ciphertext is read from the grid left-right and top-down as usual. An example of such grid is given below. Send your solution by e-mail with subject "Cryptology (1) - HW1". It should contain (1) a brief description of solution, (2) a source code used in analysis, and (3) plaintext.
      14   3   2   9  24  47  78  95  60  33
  15   4   1   8  23  46  77  96  61  34
  16   5   6   7  22  45  76  97  62  35
  17  18  19  20  21  44  75  98  63  36
  38  39  40  41  42  43  74  99  64  37
  67  68  69  70  71  72  73 100  65  66
  88  87  86  85  84  83  82  91  90  89
  55  54  53  52  51  50  81  92  57  56
  30  29  28  27  26  49  80  93  58  31
  13  12  11  10  25  48  79  94  59  32
    Ciphertexts: ct.zip
    Deadline: 29.10.2025 (midnight)