01 What is authentication?

Authentication is the process of proving that you are authorized to participate in processes/information etc.

Example: The radio station KEULE wants to check whether the radio station EREMIT is authorized for the radio circuit:

EREMIT, KEULE here, what is the authentication for YANKEE, come.
KEULE here, copy that.

How does the armed forces authenticate?

Authentication is done with the

  • Alias
  • Authentication Code
  • Numeral Code


  • The radio station chooses a letter from its code name which is available in the first column of the authentication table.
    • EREMIT => I
  • A two-digit number is determined from the letter of the code name and the letter to be authenticated using the authentication code.
    • I, Y => 80
  • The letter is encrypted with the numeral code.
    • I => JC or CJ or BD or DB
  • The number is divided into its two digits and each digit is encrypted with the numeral code.
    • 8 => OD or DO or ZG or GZ or JE … UL …
    • 0 => OI or IO or ZI or IZ or JS … WK …
  • The three pairs of letters are transmitted back.
    • JC UL WK

Structure of the tables

Authentication code

  • The header line always consists of the letters V, W, X, Y, Z
  • The left margin column always contains the letters A, D, E, G, H, I, L, N, O, R, S, T, U
  • The table contains 65 randomly selected different numbers from the range 00 .. 99

Numeral Code

  • The alphabet with its 26 letters is randomly distributed on the header line and the left margin column.
  • The content and arrangement of the table remain unchanged.