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Symme ic enc yp ion algo i hms and me hods o hei e alua ion
Razzako She bek Tog'aymu od ugli
No mu odo Cho i Begaliye ich.
Te mez S a e Uni e si y
Abs ac
This hesis analyzes he mechanisms o ope a ion o mode n symme ic enc yp ion
algo i hms, hei main ypes, and pe o mance indica o s. An analysis was also
conduc ed based on he c i e ia used in he e alua ion o enc yp ion algo i hms - speed,
secu i y, esou ce consump ion, s abili y, and key leng h. The ad an ages and
weaknesses o symme ic enc yp ion algo i hms in ensu ing da a secu i y a e
highligh ed.
Keywo ds Enc yp ion, symme ic algo i hm, AES, DES, da a secu i y, c yp analysis,
e alua ion c i e ia
In oduc ion
In ensu ing in o ma ion secu i y, eliable da a enc yp ion is ex emely impo an .
Enc yp ion algo i hms a e di ided in o wo ypes: "symme ic" and "asymme ic." In
symme ic enc yp ion, bo h enc yp ion and dec yp ion a e pe o med using a single
key. This me hod is dis inguished by i s speed and simplici y.
Basic symme ic algo i hms
The ollowing well-known symme ic enc yp ion algo i hms we e analyzed:
- DES (Da a Enc yp ion S anda d): 64-bi block algo i hm wi h a 56-bi key. Today,
he le el o secu i y is conside ed low.
- AES (Ad anced Enc yp ion S anda d): 128/192/256-bi key, high le el in e ms o
secu i y and speed.
- Blow ish is as , has a lexible w ench leng h, bu is used less equen ly han nuclea
powe plan s.
- RC5/RC6: Simple and pa ame ic algo i hms, in some cases as a he ha dwa e le el.
E alua ion c i e ia
The ollowing c i e ia a e used o e alua e symme ic algo i hms:
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1. Speed (Pe o mance): Da a enc yp ion and dec yp ion speed (ms/MB).
2. Secu i y le el: Resis ance o c yp analysis, key leng h, block size.
3. Resou ce equi emen s: RAM and p ocesso load.
4. Simplici y: So wa e and ha dwa e lexibili y.
5. S abili y: Sensi i i y o small changes (A alanche e ec ).
1. Selec ed algo i hms
Wi hin he amewo k o he s udy, he ollowing symme ic enc yp ion algo i hms
we e selec ed, which a e widely used and conside ed sa e:
• Ad anced Enc yp ion S anda d (AES)
• DES (Da a Enc yp ion S anda d)
3DES (T iple DES)
• Blow ish
• RC4
• ChaCha20
2. Enc yp ion and dec yp ion p ocesses
The ollowing s eps we e ca ied ou o each algo i hm:
• Tex iles ( a ious sizes - 1 KB, 100 KB, 1 MB) we e p epa ed.
Each ile is enc yp ed using selec ed algo i hms.
• The enc yp ed da a is dec yp ed again ( es o ed o i s o iginal s a e).
• Enc yp ion and dec yp ion speeds measu ed.
3. E alua ion c i e ia
To compa e he algo i hms, an assessmen was ca ied ou based on he ollowing
c i e ia:
Ra ing C i e ia Desc ip ion
Speed Enc yp ion and dec yp ion ime (ms, measu ed in seconds)
S o age usage Amoun o RAM used du ing enc yp ion/dec yp ion
Secu i y le el Key leng h, esis ance o analyses (di e en ial and s a is ical analyses)
Block leng h The leng h o each block (in bi s) when he algo i hm wo ks wi h blocks
Adap abili y The sui abili y o he algo i hm o ope a ion on a ious pla o ms and he
possibili y o op imiza ion
4. En i onmen o p ac ical expe ience
The expe imen s we e conduc ed unde he ollowing echnical condi ions:
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• P ocesso : In el Co e i7, 3.2 GHz
• RAM: 16 GB RAM
• Ope a ing sys em: Ubun u 22.04 LTS / Windows 11
• P og amming language: Py hon 3.11 (PyC yp odome, C yp og aphy lib a ies we e
used)
5. S a is ical analysis
Based on he ob ained esul s, s a is ical analysis was ca ied ou . Fo each algo i hm,
he a e age ope a ing ime and he p obabili y o e o we e calcula ed. The esul s
we e isually ep esen ed using g aphs and ables.
Fo a pe ec ly secu e enc yp ion algo i hm, he compu a ional complexi y is he same
as he key ield, which is some imes also called he en opy o he key. The key ield
e e s o he se o all possible keys and ep esen s he o al numbe o hese keys. In
o he wo ds, he key ield ep esen s he o al numbe o combina ions ha can be
c ea ed using all sec e key bi s.
Resul s
As a esul o he analysis, he ollowing conclusions we e made:
Nuclea powe plan s a e conside ed he sa es and mos widely used symme ic
algo i hm.
DES is cu en ly ou da ed and canno mee mode n equi emen s.
Blow ish is con enien o small sys ems, bu no uni e sal.
Acco ding o he assessmen esul s, he NPP algo i hm is he mos op imal choice in
he speed-sa e y a io.
Conclusion
Symme ic enc yp ion algo i hms allow o as and e icien in o ma ion p o ec ion.
When selec ing hem, i is necessa y o ake in o accoun he capabili ies o he sys em
and he needs o he secu i y le el.
In mode n in o ma ion sys ems, i is ecommended o use he AES algo i hm as he
main ool.
Re e ences
1. S allings, W. *C yp og aphy and Ne wo k Secu i y*, Pea son, 2020.
2. Schneie , B. *Applied C yp og aphy*, Wiley, 2015.
3. NIST. *Fede al In o ma ion P ocessing S anda ds (FIPS) 197: AES*, 2001.
4. Beh ouz Fo ouzan. *C yp og aphy and Ne wo k Secu i y*, McG aw-Hill,
2017.
5. Scien i ic a icles and s anda ds on c yp og aphy in Uzbekis an.
