Science, research, development #25

CRYPTOGRAPHY AND STEGANOGRAPHY
O’rinov Nodirbek Toxirjonovich
Teacher, Department of Informatics Methods of teaching at Andijan State 
[e-mail]
Umarova Ra’no Ubaydullayevna
Teacher, Department of Informatics Methods of teaching at Andijan State University
Annotation: 
Cryptography is one way to protect this information with encryption. 
And the shorthand is to hide classified information. The use of cryptography and short-
hand can be achieved by hiding information.
Key words:
Crypto, target, shorthand, cryptography, secret.

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179
SCIENCE, RESEARCH, DEVELOPMENT
№25
steganography. Only the first is closely 
related to cryptography. Tech nical forms 
of steganography can be outlined quickly: 
invisible ink was used since the time of 
Pliny. Onion juice and milk have proved 
effective and have been popular in the 
Length SRI centuries (initially invisible 
on paper, they acquire a brown color by 
heat or ultraviolet radiation). Other class 
-classical examples – hollow heels and 
suitcases with false bottoms.
Among the modern methods of techni-
cal steganography noteworthy – High tele-
graph, transmission volley prepainted ritel-
no recorded on magnetic tape Morse code 
sequence of 20 characters per second, and 
the rearrangement of the frequency sub-
bands (“skrem blirovanie”) spectrum of the 
speech signal in the case of telephone com-
munication, widely used today for com-
mercial purposes. During the Second 
World War research unit 
Forschungsstelle 
German Reyhspochty headed by Kurt E. 
Vetterleynom eavesdrop on supposedly 
from March 1942 secret radiotelephone 
conversations between Franklin Delano 
Roosevelt that, and Winston Churchill, 
including a conversation on 29 July 1943, 
directly before the truce with Italy. Through 
Schellenberg, these conversations were re-
ported to Himmler.
Transmission of confidential written 
communications has revolutionized mi-
crograph: 
microdots 
the size of a speck of 
dirt may contain reap a whole page of 
text. Microdots – this extraordinary de-
velopment “ macropoint « Histiaesa 
1 
), 
who shaved the head of his slave, writes a 
message on it, and then waited for the 
hair grow back again. Microdots were in-
vented in the 1920s by Emmanuel Gold-
berg. Soviet reconnaissance snip Rudolf 
Abel gets in their microdots on the film 
for a spectroscope, being able to buy it 
without attracting undue attention. 
Another Soviet spy, Gordon Arnold Lon-
sdale, hid his microdots in bound ware-
house invoices. Microdots used German 
E in World War II, have a size allowing 
them to be used as a point in printed 
document.
References
1. M. Abadi and R. Needham, “Prudent En-
gineering Practice for Cryptographic Pro-
tocols,” Research Report 125, Digital 
Equipment Corp Systems Research Cent-
er, Jun 1994.
2. ANSI X9.8, “American National Standard 
for Personal Information Number (PIN) 
Management and Security, “ American 
Bankers Association, 1982.
3. W.G. Barker, Cryptanalysis of the Hagelin 
Cryptograph, Aegean Park Press, 1977.

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