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Cryptography. Cryptography, or cryptology (from Ancient Greek: κρυπτός, romanized : kryptós "hidden, secret"; and γράφειν graphein, "to write", or -λογία -logia, "study", respectively [ 1] ), is the practice and study of techniques for secure communication in the presence of adversarial behavior. [ 2]
CrypTool. CrypTool is an open-source project [ 1] that is a free e-learning software for illustrating cryptographic and cryptanalytic concepts . According to "Hakin9", [ 2] CrypTool is worldwide the most widespread e-learning software in the field of cryptology. [ 3][ 4] CrypTool implements more than 400 algorithms. [ 5]
History of cryptography. Cryptography, the use of codes and ciphers to protect secrets, began thousands of years ago. [ 1] Until recent decades, it has been the story of what might be called classical cryptography — that is, of methods of encryption that use pen and paper, or perhaps simple mechanical aids.
Caesar cipher. The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of 3, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext. In cryptography, a Caesar cipher, also known as Caesar's ...
A cryptographic hash function ( CHF) is a hash algorithm (a map of an arbitrary binary string to a binary string with a fixed size of bits) that has special properties desirable for a cryptographic application: [ 1] the probability of a particular. n {\displaystyle n} -bit output result ( hash value) for a random input string ("message") is.
Encryption. In cryptography, encryption is the process of transforming (more specifically, encoding) information in a way that, ideally, only authorized parties can decode. This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Despite its goal, encryption does not ...
Johannes Trithemius ' Polygraphiae (1518) is the first printed book on cryptology. Books on cryptography have been published sporadically and with highly variable quality for a long time. This is despite the tempting, though superficial, paradox that secrecy is of the essence in sending confidential messages – see Kerckhoffs' principle .
Learning with errors. In cryptography, learning with errors ( LWE) is a mathematical problem that is widely used to create secure encryption algorithms. [ 1] It is based on the idea of representing secret information as a set of equations with errors. In other words, LWE is a way to hide the value of a secret by introducing noise to it. [ 2]
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