[HEID 85]

F. P. Heider,

D. Kraus, M. Welschenbach:

Mathematische Methoden der Kryptoanalyse

Vieweg – Verlag, Wiesbaden             1985.

 

[HILL 29]

L.S.Hill:

Cryptography in an algebraic alphabet

Amer. Math. Monthly, 36(1929) 306-312.

 

[HODG 83]

A. Hodges:

Alan Turing: The Enigma

Burner Books Ltd.,     London, 1983.

Német fordítás: R. Herken, E. Lack, Verlag Kammerer Unverzagt, Berlin, 1989.

  [HOFF 95]

L. J. Hoffman:

Building in Big Brother

Springer – Verlag, Berlin, 1995.

[[HOFST 00]

D.R. Hofstadter:

Gödel, Escher, Bach

Egybefont Gondolatok Birodalma

TIPOTEX Könyvkiadó, 2000.

[[HOGG 69]

V.E. Hoggatt, Jr.:

Fibonacci and Lucas Numbers

Houghton Mifflin Company, Boston, 1969.

[[HULE 88]

M. Hule, W. B. Müller:

On the RSA Cryptosystem with wrong keys

Contributions to General Algebra 6. Vienna, Verlag Hölder. Pichler-Tempsky, 1988.,103-109.