Pythagoras0: /* 메타데이터 */ 새 문단

2022-09-18T06:00:38Z

메타데이터: 새 문단

Pythagoras0: /* 노트 */ 새 문단

2022-09-18T06:00:35Z

노트: 새 문단

새 문서

== 노트 ==

===말뭉치===
# The first recorded description of the Playfair cipher was in a document signed by Wheatstone on 26 March 1854.<ref name="ref_b2ed2f31">[https://en.wikipedia.org/wiki/Playfair_cipher Playfair cipher]</ref>
# The Playfair cipher uses a 5 by 5 table containing a key word or phrase.<ref name="ref_b2ed2f31" />
# A different approach to tackling a Playfair cipher is the shotgun hill climbing method.<ref name="ref_b2ed2f31" />
# The Playfair cipher is a written code or symmetric encryption technique that was the first substitution cipher used for the encryption of data.<ref name="ref_2d06685f">[https://www.techopedia.com/definition/29770/playfair-cipher#:~:text=Techopedia%20Explains%20Playfair%20Cipher,-Created%20by%20Sir&text=The%20Playfair%20cipher's%20essential%20method,message%20into%20two%2Dletter%20bits. What is the Playfair Cipher?]</ref>
# The Playfair cipher's essential method involves creating key tables that arrange the letters of the alphabet into a square grid.<ref name="ref_2d06685f" />
# As an example of the Playfair cipher, begin with the following message text: HELLO WORLD.<ref name="ref_2d06685f" />
# The Playfair cipher was invented in 1854 by Charles Wheatstone, but named after lord Playfair who heavily promoted the use of the cipher.<ref name="ref_951dd169">[https://www.boxentriq.com/code-breaking/playfair-cipher Playfair Cipher (online tool)]</ref>
# Instead of encrypting single letters, the Playfair cipher encrypts pairs of letter (digrams or bigrams).<ref name="ref_951dd169" />
# next → ← prev Playfair Cipher Program in Java Playfair cipher is proposed by Charles Whetstone in 1889.<ref name="ref_df7d395b">[https://www.javatpoint.com/playfair-cipher-program-in-java#:~:text=In%20comparison%20to%20monoalphabetic%20cipher,262%20(676)%20digraphs. Playfair Cipher Program in Java]</ref>
# In this section, we will discuss Playfair cipher along with its implementation in a Java program.<ref name="ref_df7d395b" />
# Playfair Cipher Playfair cipher is an encryption algorithm to encrypt or encode a message.<ref name="ref_df7d395b" />
# Since Playfair cipher encrypts the message digraph by digraph.<ref name="ref_df7d395b" />
# In playfair cipher, initially a key table is created.<ref name="ref_2dabac93">[https://www.tutorialspoint.com/cryptography/traditional_ciphers.htm Traditional Ciphers]</ref>
# The Play-Fair algorithm uses a 5x5 matrix of letters called Playfair square or Wheatston-square, constructed using keyword.<ref name="ref_f0e8e277">[https://www.educative.io/answers/encryption-using-playfair-cipher Encryption using Playfair Cipher]</ref>
# Below is an example of a Playfair cipher, solved by Lord Peter Wimsey in Dorothy L. Sayers’s Have His Carcase (1932).<ref name="ref_2e588872">[https://www.britannica.com/topic/Playfair-cipher Playfair cipher | data encryption]</ref>
# The loss of a significant part of the plaintext frequency distribution, however, makes a Playfair cipher harder to cryptanalyze than a monoalphabetic cipher.<ref name="ref_2e588872" />
# The coastwatchers regularly used the Playfair system.<ref name="ref_b38730e1">[http://www.practicalcryptography.com/ciphers/playfair-cipher/ Practical Cryptography]</ref>
# Cryptanalysis of the playfair cipher is much more difficult than normal simple substitution ciphers, because digraphs (pairs of letters) are being substituted instead of monographs (single letters).<ref name="ref_b38730e1" />
# 12 Example: Playfair Cipher Program le for this chapter: playfair This project investigates a cipher that is somewhat more complicated than the simple substitution cipher of Chapter 11.<ref name="ref_1b93c6c2">[https://people.eecs.berkeley.edu/~bh/pdf/v1ch12.pdf 12]</ref>
# Advantages to Digraphic Ciphers Kahn, in his discussion of the Playfair Cipher, points out several advantages of the digraphic (enciphering letter pairs) ciphers: 1.<ref name="ref_5a23f982">[https://www.nku.edu/~christensen/1402%20Playfair%20cipher.pdf Spring 2015]</ref>
# The Playfair cipher encrypts pairs of letters, called bigrams.<ref name="ref_2400a7c4">[https://privacycanada.net/playfair-cipher/ Detailed Guide 2022]</ref>
# In this study, the authors proposed an enhanced key security of Playfair cipher algorithm using Playfair cipher 16x16 matrix, XOR, two's complement, and bit swapping.<ref name="ref_e7ef0553">[https://dl.acm.org/doi/abs/10.1145/3316615.3316689 An Enhanced Key Security of Playfair Cipher Algorithm]</ref>
# Also, the proposed method is faster than the existing key security of Playfair cipher algorithm.<ref name="ref_e7ef0553" />
# The Playfair Cipher is a simple pencil-and-paper cipher which doesn't suffer from some of the common weaknesses with simple substitution ciphers.<ref name="ref_83ca1967">[https://chrome.google.com/webstore/detail/playfair-cipher/igmiiphijligfkpgioddalhdipioegca?hl=en Playfair Cipher]</ref>
# In the Playfair cipher, there are many letters that will stand for an E, making it much harder to crack!<ref name="ref_c79cac58">[https://www.popularmechanics.com/science/math/a40706789/playfair-cipher-puzzle/ Can You Solve This Playfair Cipher Puzzle?]</ref>
# Throughout my upbringing, I often heard of detectives and spies using the Playfair cipher as a way to encode/decode messages’ meanings.<ref name="ref_89dcf64c">[https://hankeringforhistory.com/history-of-the-playfair-cipher/ History of the Playfair Cipher]</ref>
# The Playfair cipher is notable because it is one of the first ciphers that paired letters (also known as a digraph) instead of using a single letter cipher.<ref name="ref_89dcf64c" />
# The Playfair cipher was originally thought by the British Foreign Office as too complex; they feared that using this cipher would take too much time and would be ineffective in the field.<ref name="ref_89dcf64c" />
# The Playfair cipher was predominantly used by British forces during the Second Boer War (1899-1902) and World War I (1914-1918).<ref name="ref_89dcf64c" />
# The first block cipher we will discuss is the Playfair Cipher which dates back to the 1800's.<ref name="ref_d06879c6">[http://facweb1.redlands.edu/fac/Tamara_Veenstra/cryptobook/playfair.html Playfair Cipher]</ref>
# Usually a Playfair cipher uses a keyword to arrange the alphabet in a five-by-five grid.<ref name="ref_d06879c6" />
# To encipher a message using the Playfair square we first break our message into blocks of two letters.<ref name="ref_d06879c6" />
# For the second block in the plaintext we find E and T in the Playfair square.<ref name="ref_d06879c6" />
# This is a C Program to implement Playfair cipher.<ref name="ref_8fa496d0">[https://www.sanfoundry.com/c-program-encode-message-using-playfair-cipher/ Playfair Cipher Encryption Program in C]</ref>
# Here is the source code of the C Program to Encode a Message Using Playfair Cipher.<ref name="ref_8fa496d0" />
# The encryption key for a Playfair cipher is a word, i.e., a nite sequence of characters taken from the set of plaintext characters.<ref name="ref_0fad4328">[https://math.asu.edu/sites/default/files/playfair.pdf Playfair ciphers]</ref>
# and we want to encrypt the message rocky mountain meadow using a Playfair cipher with this keyword.<ref name="ref_0fad4328" />
# Playfair cipher is the first and best-known digraph substitution cipher, which uses the technique of symmetry encryption.<ref name="ref_8e3f376f">[https://www.linkedin.com/pulse/playfair-cipher-jahnavi-redrouthu?trk=pulse-article_more-articles_related-content-card PLAYFAIR CIPHER]</ref>
# The Playfair cipher is relatively fast and doesn’t require special equipment.<ref name="ref_8e3f376f" />
# The Playfair Cipher uses digraphs to encrypt and decrypt from a 5x5 matrix constructed from a sequence key of 25 unique letters.<ref name="ref_ba0fa829">[https://github.com/damiannolan/simulated-annealing-playfair-cipher-breaker/blob/master/README.md simulated-annealing-playfair-cipher-breaker/README.md at master · damiannolan/simulated-annealing-playfair-cipher-breaker]</ref>
# Playfair cipher have made significant progress on improving its security, but little attention was given to optimize or maintain the original time and space efficiency.<ref name="ref_d461cd70">[https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12167/121671M/Hybrid-Playfair--a-modified-Playfair-cipher-combining-2D-and/10.1117/12.2628650.full Hybrid Playfair: a modified Playfair cipher combining 2D and 3D Playfair]</ref>
# To close the gap, this paper proposes Hybrid Playfair, a modified Playfair cipher using a three-dimensional key and 2-character message pairs for encryption and decryption.<ref name="ref_d461cd70" />
# This paper exhibits a variation in the implementation of a classical cipher technique, the Playfair cipher.<ref name="ref_466b8022">[https://people.cis.fiu.edu/gubbisadashiva/wp-content/uploads/sites/9/2019/11/A-Variation-in-the-Working-of-Playfair-Cipher.pdf A variation in the working of playfair cipher]</ref>
# Sections II and III discuss the classical Playfair cipher technique and other related works in this domain.<ref name="ref_466b8022" />
# Matrix formed with key phrase HELLO WORLD as per Playfair cipher letters from the alphabet (Fig. 2).<ref name="ref_466b8022" />
# Plaintext enciphered to ciphertext as per Playfair cipher with assumed inputs 3.<ref name="ref_466b8022" />
===소스===
<references />

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	===소스===		===소스===
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		+
		+	== 메타데이터 ==
		+
		+	===위키데이터===
		+	* ID : [https://www.wikidata.org/wiki/Q829915 Q829915]
		+	===Spacy 패턴 목록===
		+	* [{'LOWER': 'playfair'}, {'LEMMA': 'square'}]
		+	* [{'LOWER': 'playfair'}, {'LOWER': 'cipher'}]
		+	* [{'LOWER': 'playfair'}, {'LEMMA': 'system'}]

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Pythagoras0: /* 메타데이터 */ 새 문단

Pythagoras0: /* 노트 */ 새 문단