Cryptography - Revision history

Murienne at 15:54, 31 May 2022

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	<references />		<references />

	[[Category:~~A&S~~]]		[[Category:Arts and Sciences]]

Ealdthryth at 15:43, 31 March 2020

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	~~[[Category:A&S]]~~

	Cryptography is the science of using codes and ciphers to conceal information. Cryptology is the study of cryptography. Codes and ciphers are terms that are often used interchangeably, but they are distinctly different. A code replaces one piece of information for another entirely different piece of information where the meaning of both is known to both the sender and recipient. A common example of this may be using a phrase such as ''We have contact'' to mean ''We have found the thing we're looking for''. A cipher, on the other hand, modified the information itself to obscure its meaning. A cipher also conceals information but does so by changing the original information (plain text) to cipher text (sometimes referred to as 'black text'). The Polybius Cipher, described below, is an early example of a substitution cipher.		Cryptography is the science of using codes and ciphers to conceal information. Cryptology is the study of cryptography. Codes and ciphers are terms that are often used interchangeably, but they are distinctly different. A code replaces one piece of information for another entirely different piece of information where the meaning of both is known to both the sender and recipient. A common example of this may be using a phrase such as ''We have contact'' to mean ''We have found the thing we're looking for''. A cipher, on the other hand, modified the information itself to obscure its meaning. A cipher also conceals information but does so by changing the original information (plain text) to cipher text (sometimes referred to as 'black text'). The Polybius Cipher, described below, is an early example of a substitution cipher.
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			[[Category:A&S]]

Ealdthryth at 15:42, 31 March 2020

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			[[Category:A&S]]

	Cryptography is the science of using codes and ciphers to conceal information. Cryptology is the study of cryptography. Codes and ciphers are terms that are often used interchangeably, but they are distinctly different. A code replaces one piece of information for another entirely different piece of information where the meaning of both is known to both the sender and recipient. A common example of this may be using a phrase such as ''We have contact'' to mean ''We have found the thing we're looking for''. A cipher, on the other hand, modified the information itself to obscure its meaning. A cipher also conceals information but does so by changing the original information (plain text) to cipher text (sometimes referred to as 'black text'). The Polybius Cipher, described below, is an early example of a substitution cipher.		Cryptography is the science of using codes and ciphers to conceal information. Cryptology is the study of cryptography. Codes and ciphers are terms that are often used interchangeably, but they are distinctly different. A code replaces one piece of information for another entirely different piece of information where the meaning of both is known to both the sender and recipient. A common example of this may be using a phrase such as ''We have contact'' to mean ''We have found the thing we're looking for''. A cipher, on the other hand, modified the information itself to obscure its meaning. A cipher also conceals information but does so by changing the original information (plain text) to cipher text (sometimes referred to as 'black text'). The Polybius Cipher, described below, is an early example of a substitution cipher.

Ealdthryth at 19:34, 17 February 2020

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	[[File:hahalruna.png\|center\|600px\|Runic cipher index system ]]		[[File:hahalruna.png\|center\|600px\|Runic cipher index system ]]

	=~~References~~=		=Notes=
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Ealdthryth at 18:03, 17 February 2020

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	==Runic Ciphers==		==Runic Ciphers==
	[[File:hahalruna.png\|center\|~~400px~~\|Runic cipher index system ]]		[[File:hahalruna.png\|center\|600px\|Runic cipher index system ]]

	=References=		=References=
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Ealdthryth at 18:02, 17 February 2020

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	==Runic Ciphers==		==Runic Ciphers==
	[[File:~~Hahalruna~~.png\|center\|~~200px~~\|Runic cipher index system ]]		[[File:hahalruna.png\|center\|400px\|Runic cipher index system ]]

	=References=		=References=
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Ealdthryth at 18:01, 17 February 2020

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	11 44 31 11 33 44 24 11		11 44 31 11 33 44 24 11

			==Runic Ciphers==
			[[File:Hahalruna.png\|center\|200px\|Runic cipher index system ]]
	=References=		=References=
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Ealdthryth at 17:55, 17 February 2020

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	A transposition cipher moves elements of the plain text and reorders the message so that it is unreadable without knowing the pattern<ref>Baun, Kevin W. “Transposition Ciphers.” History of Crypto. Accessed February 17, 2020. http://crypto.houseblueheron.com/transposition.php.</ref>.		A transposition cipher moves elements of the plain text and reorders the message so that it is unreadable without knowing the pattern<ref>Baun, Kevin W. “Transposition Ciphers.” History of Crypto. Accessed February 17, 2020. http://crypto.houseblueheron.com/transposition.php.</ref>.

			Example:
	This is a rail fence cipher		This is a rail fence cipher
	T I A E C E		T I A E C E
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	===Polybius Cipher===		===Polybius Cipher===
	This grid cipher substitution cipher is attributed to the Cleoxenus and Democleitus but was improved by and so attributed to Polybius in ''The Histories'' <ref>Citation needed</ref>. The basic operation of the 5x5 grid is to find the row and collum of each letter to produce an index value. Each index will have exactly two numbers for its index so spacing is not relevant to the code itself.		This grid cipher substitution cipher is attributed to the Cleoxenus and Democleitus but was improved by and so attributed to Polybius in ''The Histories'' <ref>Citation needed</ref>. The basic operation of the 5x5 grid is to find the row and collum of each letter to produce an index value. Each index will have exactly two numbers for its index so spacing is not relevant to the code itself.

	~~A T L A N T I A~~
	~~11 44 31 11 33 44 24 11~~

	{\| class="wikitable"		{\| class="wikitable"
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	\| 5 \|\| V \|\| W \|\| X \|\| Y \|\| Z		\| 5 \|\| V \|\| W \|\| X \|\| Y \|\| Z
	\|}		\|}

			Example:
			A T L A N T I A
			11 44 31 11 33 44 24 11

	=References=		=References=
	<references />		<references />

Ealdthryth at 17:53, 17 February 2020

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	Cryptography is the science of using codes and ciphers to conceal information. Cryptology is the study of cryptography. Codes and ciphers are terms that are often used interchangeably, but they are distinctly different. A code replaces one piece of information for another entirely different piece of information where the meaning of both is known to both the sender and recipient. A common example of this may be using a phrase such as ''We have contact'' to mean ''We have found the thing we're looking for''. A cipher, on the other hand, modified the information itself to obscure its meaning. A cipher also conceals information but does so by changing the original information (plain text) to cipher text (sometimes referred to as 'black text'). The Polybius Cipher, described below, is an early example of a substitution cipher.		Cryptography is the science of using codes and ciphers to conceal information. Cryptology is the study of cryptography. Codes and ciphers are terms that are often used interchangeably, but they are distinctly different. A code replaces one piece of information for another entirely different piece of information where the meaning of both is known to both the sender and recipient. A common example of this may be using a phrase such as ''We have contact'' to mean ''We have found the thing we're looking for''. A cipher, on the other hand, modified the information itself to obscure its meaning. A cipher also conceals information but does so by changing the original information (plain text) to cipher text (sometimes referred to as 'black text'). The Polybius Cipher, described below, is an early example of a substitution cipher.

	A timeline of cryptography through the middle ages may be found on the [http://crypto.houseblueheron.com/timeline.php House Blue Heron ~~Cryptography~~ website]		A timeline of cryptography through the middle ages may be found on the [http://crypto.houseblueheron.com/timeline.php House Blue Heron cryptography website]
	<ref>Baun, Kevin W. “Cryptography Timeline.” History of Cryptography, February 17, 2020. http://crypto.houseblueheron.com/timeline.php.</ref>.		<ref>Baun, Kevin W. “Cryptography Timeline.” History of Cryptography, February 17, 2020. http://crypto.houseblueheron.com/timeline.php.</ref>.

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	==Substitution Ciphers==		==Substitution Ciphers==

			A wide variety of substitution ciphers were used through the SCA Period. More information on the basic operation of substitution ciphers can be found on the [http://crypto.houseblueheron.com/substitution.php House Blue Heron cryptography website]<ref>Baun, Kevin W. “Substitution Ciphers.” History of Cryptography, February 17, 2020. http://crypto.houseblueheron.com/substitution.php</ref>.

	===Polybius Cipher===		===Polybius Cipher===

Ealdthryth at 17:47, 17 February 2020

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	==Transposition Ciphers==		==Transposition Ciphers==
	A transposition cipher moves elements of the plain text and reorders the message so that it is unreadable without knowing the pattern<ref>~~Citation Needed~~</ref>.		A transposition cipher moves elements of the plain text and reorders the message so that it is unreadable without knowing the pattern<ref>Baun, Kevin W. “Transposition Ciphers.” History of Crypto. Accessed February 17, 2020. http://crypto.houseblueheron.com/transposition.php.</ref>.

	This is a rail fence cipher		This is a rail fence cipher