Osnovni tipovi enkripcija / Kriptografija i Kriptoanaliza / Tutorial

American Cryptogram Association
http://www.cryptogram.org/cdb/aca.info/aca.and.you/contents.html

Opisi razlicitih tipova enkripcija :
http://www.und.nodak.edu/org/crypto/crypto/.chap08.html

ARISTOCRATS, PATRISTOCRATS and XENOCRYPT SUBSTITUTIONS
CRYPTARITHMS
AMSCO (period times 8-12 lines deep)
AUTOKEY (40-50 letters)
BACONIAN (25-letter plaintext maximum)
BAZERIES (200-250 letters)
BEAUFORT (width of period times 12-15 lines deep)
BIFID (125-150 letters)
BIFID Contd: TWIN BIFID (125-150 letters each, 25 letter minimum repeat)
BIFID contd: CM BIFID (Conjugated Matrix Bifid) (150-200 letters)
BIFID contd: 6x6 BIFID (125-150 letters)
CADENUS (period not over 6)
CHECKERBOARD (40-50 pairs)
COMPLETE COLUMNAR TRANSPOSITION (period times 8-15 lines deep)
FOURSQUARE (50-60 pairs)
FRACTIONATED MORSE (110-150 plaintext letters)
GRANDPRE (150-200 letters)
GRILLE (12x12 square maximum)
GROMARK (100-150 letters)
PERIODIC GROMARK (75-100 letters)
GRONSFELD (width of period times 12-15 lines deep)
HOMOPHONIC (50-75 pairs)
INCOMPLETE COLUMNAR (period times 15-18 lines deep)
INTERRUPTED KEY (40-50 letters)
KEY PHRASE (75-100 letters)
MORBIT (50-75 letters)
MYSZKOWSKI (period times 12-15 lines deep)
NICODEMUS (width of period times 15-18 lines deep)
NIHILIST SUBSTITUTION
NIHILIST TRANSPOSITION (10x10 maximum)
NULL (25-letter plaintext maximum)
PHILLIPS (4 rows deep maximum, 160 letters)
PLAYFAIR (40-50 pairs)
SERIATED PLAYFAIR (10-15 groups paired)
POLLUX (155-385 letters)
PORTA (width of period times 12-15 lines deep)
PORTAX (width of period times 16-24 lines deep, 8-12 lines paired)
PROGRESSIVE KEY (100-150 letters)
QUAGMIRE I (width of period times 15-18 lines deep)
QUAGMIRE II (width of period times 15-18 lines deep)
QUAGMIRE III (width of period times 20-25 lines deep)
QUAGMIRE IV (width of period times 25-30 lines deep)
RAGBABY (80-150 letters)
RAILFENCE (3-7 rails, 10-15 times number of rails)
REDEFENCE (3-7 rails, 10-15 times the number of rails)
ROUTE (8x8 square maximum, 8x10 recatangle maximum)
RUNNING KEY (40-50 letters)
SLIDEFAIR (period times 15-18 lines deep)
TRI-DIGITAL (75-100 letters)
TRIFID (120-150 letters)
TRI-SQUARE (100-125 groups)
TWO-SQUARE (40-50 pairs)
VARIANT (width of period times 12-15 lines deep)
VIGENERE (width of period times 12-15 lines deep)

Programi :
http://ipgpp.veniece.com/cgi-b...ography/Programming_Libraries/


Classical Cryptography Lessons by LANAKI (Jako dobro za pocetnike :))
http://members.aol.com/jpeschel/lessons.htm


Ako ima tko jos koje dobre linkove moze da jih postuje ovdje.
Vech unaprijed hvala

Potpis

Pozdrav StratOS
"Multitasking - ability to f##k up several things at once."
"It works better if you plug it in."
"As a rule, software systems do not work well until they have been used, and have failed repeatedly, in real applications."
"The one who is digging the hole for the other to fall in is allready in it."

A Cryptographic Compendium :
http://fn2.freenet.edmonton.ab.ca/~jsavard/crypto/jscrypt.htm

http://www.faqs.org/faqs/cryptography-faq/
http://members.aol.com/jpeschel/index.htm
http://www.und.nodak.edu/org/crypto/crypto/resources.html
http://www.und.nodak.edu/org/crypto/crypto/
http://fn2.freenet.edmonton.ab.ca/~jsavard/crypto/intro.htm

Potpis

Pozdrav StratOS
"Multitasking - ability to f##k up several things at once."
"It works better if you plug it in."
"As a rule, software systems do not work well until they have been used, and have failed repeatedly, in real applications."
"The one who is digging the hole for the other to fall in is allready in it."

Besplatan demo program za sifrovanje i desifrovanje tekstualnih poruka koji se moze i koristiti na adresi:
http://www.generalelektronik.web1000.com/kripto.html

Jeli zna neko knjigu od kriptografiji na nasem jeziku a da je dovoljno jasno i interesantno za pocetnika napisana .


pozdrav .

Potpis

open your mind

Cao,

evo jos jedna Knjiga(ali na engleskom) Handbook of Applied Cryptogaphy

http://www.cacr.math.uwaterloo.ca/hac/

pozdrav

Krajem 70-tih izdana je knjiga Šifranti protiv špijuna u nekoliko dijelova. Tamo je opisana povijest kriptografije. Meni je to zanimljiva knjiga ali joj fali malo suvremenijih poglavlja (npr. o diferencijalnij kriptoanalizi, DES-u...). Knjiga ima nekoliko dijelova i popriličan broj stranica.
A možeš otići i na http://www.math.hr/~duje/kript/kriptografija.html

ima li iko da bi mi mogao dati neki kratki text o enkripciji u winxp-u? mucim se sa seminarskim koji ima 20 razlicitih podnaslova, pa i jos se moram s tim patiti. moze i meki link sa textom na nasem jeziku. sa engleskog sam prevela veci dio seminarskog, pa mi se vise smucilo od njega.

Evo popisa literature ...


http://www.math.hr/~duje/kript/kriptoref.html

Potpis

BobMarley (me) ...the legend

knjigu sam dobio kao rodjendanski poklon i nisam je ostavio dok je nisam skroz iscitao.

Sajmon Sing: Knjiga o siframa, Umece tajnih komunikacija od drevnog Egipta
do kvantne kriptografije

original
Simon Singh:
The Code Book, The Secret History of Codes and Codebreaking

Ostavite se knjiga tako necete nikad nista nauciti samo ce te postat gotovani. Kriptografija se ne cita nego uci. Kriptografija se svodi na samo razmisljanje od pocetka do kraja dakle knjiga nije potrebna da bi znali kriptografiju (ne morate cak znati sto znaci rijec kriptografija).

Uzmite list papira, ukljucite mozak i ucite sami (bez knjige).

Potpis

~ Adr-1 ~

Evo jos jedne dobre knjige:

Bruce Schneier: Applied Cryptoography, John Willey & Sons

Jel zna neko da li ima negde da se nabavi ta knjiga u PDFu, PSu, DVI, ... ?
Nesto mi se ne daje $60 + postarina

Potpis

... and the aliens sent an android down to earth, to slow down mankind's development
... and they named it Bill Gates.

Imam ja u html-u oko 2.5 mb oces?

hocu, jel imas negde da okacis na net? ili mi posalji na [email protected]

Potpis

... and the aliens sent an android down to earth, to slow down mankind's development
... and they named it Bill Gates.

Ako moze posaljite tu knjigu na [email protected]
Thanks!

upravo ti saljem. proveri mejl za par minuta.

Potpis

... and the aliens sent an android down to earth, to slow down mankind's development
... and they named it Bill Gates.

Ajde okaci to negde da ti ne dosadjujemo, ili ako ti ne predstavlja problem
posalji i na [email protected]

Ok znam da tje pitanje biti glupo ali me zaista interesuje. Shta je tachno kriptografija, shta je poenta te prica i kako to funkcionise?

Zamolio bih ljude da mi u par rechenica to kaze kako bih znao makar uvod u celu pricu!

Potpis

Real power is never given,
it is taken!

Kako misliš „šta je to kriptografija“??? Ne razumem o čemu pričaš? Kriptografija je kad nešto enkriptuješ, što će reći kad ga predstaviš na drugačiji način koji nije jasno čitljiv. Jednostavan primer kriptografije je npr. akrostih. Prva slova svake strofe zajedno čine neki tekst (obično je to jedna reč ili eventualno rečenica). Svaki tip kritovanja se svodi na to da zameniš nešto (običan tekst, npr) sa nečim drugim i onda npr. pošalješ nekome, ko to vrati u prvobitan oblik. Na taj način samo ti i taj neko drugi možete da čitate šta je tu napisano, za razliku od svih drugih koji ne mogu.

Pogledaj na primer ovu temu i naćićeš dosta primera kriptovanja i kriptografije.

Potpis

... and the aliens sent an android down to earth, to slow down mankind's development
... and they named it Bill Gates.

Najkrace objasnjenje toga sta je kriptografija:
The science of keeping information secure.

Malo 'duze' objasnjenje:
A process associated with scrambling plaintext (ordinary text, or cleartext) into ciphertext (a process called encryption), then back again (known as decryption). Cryptography concerns itself with four objectives:
1) Confidentiality (the information cannot be understood by anyone for whom it was unintended)
2) Integrity (the information cannot be altered in storage or transit between sender and intended receiver without the alteration being detected)
3) Non-repudiation (the creator/sender of the information cannot deny at a later stage his or her intentions in the creation or transmission of the information)
4) Authentication (the sender and receiver can confirm each other

Ljudi hvala vam na ovim odgovorima pomogli ste mi dosta zaista.
Dobio sam ideju da sam smislim neki algoritam za kriptovanje i da napravim svoj program za enkripciju/dekripciju!

Potpis

Real power is never given,
it is taken!