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2025-02-23T21:20:43Z

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			== Cryptography ==
			<gallery>
			File:Lorenz-SZ42-2.jpg\|Lorenz SZ42
			File:Caesar_cipher_left_shift_of_3.svg\|Caesar cipher left shift of 3
			File:Skytala&EmptyStrip-Shaded.png\|Skytale
			File:Al-kindi_cryptographic.png\|Al-Kindi cryptographic
			File:16th_century_French_cypher_machine_in_the_shape_of_a_book_with_arms_of_Henri_II.jpg\|16th century French cypher machine in the shape of a book with arms of Henri II
			File:Encoded_letter_of_Gabriel_Luetz_d_Aramon_after_1546_with_partial_deciphering.jpg\|Encoded letter of Gabriel Luetz d'Aramon after 1546 with partial deciphering
			File:Symmetric_key_encryption.svg\|Symmetric key encryption
			File:International_Data_Encryption_Algorithm_InfoBox_Diagram.svg\|International Data Encryption Algorithm InfoBox Diagram
			File:Public_key_encryption.svg\|Public key encryption
			File:Diffie_and_Hellman.jpg\|Diffie and Hellman
			File:Private_key_signing.svg\|Private key signing
			File:Enigma.jpg\|Enigma
			</gallery>

Prab: CSV import

2024-02-22T05:15:26Z

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'''Cryptography''' is the practice and study of techniques for secure communication in the presence of third parties called adversaries. More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages; various aspects in information security such as data confidentiality, data integrity, authentication, and non-repudiation are central to modern cryptography.

== History ==

Cryptography prior to the modern age was effectively synonymous with [[encryption]], the conversion of information from a readable state to apparent nonsense. The originator of an encrypted message shared the decoding technique needed to recover the original information only with intended recipients, thereby precluding unwanted persons from doing the same.

== Modern Cryptography ==

Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions, making such algorithms hard to break in practice by any adversary. It is theoretically possible to break such a system, but it is infeasible to do so by any known practical means.

== Cryptographic Algorithms ==

Cryptographic algorithms are divided into two categories: symmetric key algorithms (Private-key cryptography) and public key algorithms. In a symmetric key algorithm, the sender and receiver must have a shared key set up in advance and kept secret from all other parties; the sender uses this key for encryption, and the receiver uses the same key for decryption. In a public key algorithm, there are two keys: a public key, which is known to all, and a private key, which is known only to the recipient of the messages.

== Cryptanalysis ==

Cryptanalysis is the study of methods for obtaining the meaning of encrypted information, without access to the secret information that is normally required to do so. Typically, this involves knowing how the system works and finding a secret key. Cryptanalysis is also referred to as codebreaking or cracking the code.

== Cryptography in the World ==

Cryptography is used in many applications like banking transactions cards, computer passwords, and e-commerce transactions.

== See Also ==

* [[Encryption]]
* [[Decryption]]
* [[Symmetric key algorithm]]
* [[Public key algorithm]]
* [[Cryptanalysis]]

[[Category:Cryptography]]
[[Category:Computer Science]]
[[Category:Security]]

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← Older revision		Revision as of 21:20, 23 February 2025
Line 34:		Line 34:

	{{stub}}		{{stub}}
			== Cryptography ==
			<gallery>
			File:Lorenz-SZ42-2.jpg\|Lorenz SZ42
			File:Caesar_cipher_left_shift_of_3.svg\|Caesar cipher left shift of 3
			File:Skytala&EmptyStrip-Shaded.png\|Skytale
			File:Al-kindi_cryptographic.png\|Al-Kindi cryptographic
			File:16th_century_French_cypher_machine_in_the_shape_of_a_book_with_arms_of_Henri_II.jpg\|16th century French cypher machine in the shape of a book with arms of Henri II
			File:Encoded_letter_of_Gabriel_Luetz_d_Aramon_after_1546_with_partial_deciphering.jpg\|Encoded letter of Gabriel Luetz d'Aramon after 1546 with partial deciphering
			File:Symmetric_key_encryption.svg\|Symmetric key encryption
			File:International_Data_Encryption_Algorithm_InfoBox_Diagram.svg\|International Data Encryption Algorithm InfoBox Diagram
			File:Public_key_encryption.svg\|Public key encryption
			File:Diffie_and_Hellman.jpg\|Diffie and Hellman
			File:Private_key_signing.svg\|Private key signing
			File:Enigma.jpg\|Enigma
			</gallery>

Cryptography - Revision history

Prab: CSV import

Prab: CSV import