管玄乐团
发表于 2025-3-21 18:16:42
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藕床生厌倦
发表于 2025-3-21 22:51:03
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Neutropenia
发表于 2025-3-22 03:39:52
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morale
发表于 2025-3-22 04:43:40
Random Numbers used, the Vigenère method (and also other polyalphabetic ciphers) produces ciphertext with a uniform distribution of letters. The only way to decipher such ciphertext, even if the encryption method is known, is to try all possible keys. This, however, is impractical even with the help of a fast com
PANG
发表于 2025-3-22 10:26:06
The Enigmacy and have constructed machines and instruments of various types to produce fast, reliable encryption. This chapter concentrates on the most famous of those machines, namely the German Enigma, used during the Second World War. Following a short discussion of simple rotor encryption machines (Sectio
吼叫
发表于 2025-3-22 13:49:09
Stream Ciphersital computer which uses binary numbers, secure codes had to be based on bits. If the plaintext is text, then it is represented internally either in ASCII, with eight bits per character (seven code bits and one parity bit) or in Unicode, with 16 bits per character.
吼叫
发表于 2025-3-22 19:56:04
Block Ciphersrning each block of plain-text (plainblock) into a block of ciphertext (cipherblock) that has the same size. The same algorithm is used to encrypt all the blocks, and this algorithm should preferably be reversible. A reversible algorithm simplifies any implementations (software or hardware) because
white-matter
发表于 2025-3-22 22:41:33
Quantum Cryptographyk RSA-encrypted messages. In the future, however, this situation may change. After hundreds of years of effort, no efficient factoring algorithm has been found, so the chance that such an algorithm exists seems slim. However, until it is proved that such an algorithm does not exist, the possibility
CRUDE
发表于 2025-3-23 03:11:08
Data Hiding in Images.. This approach has two disadvantages: the information hiding capacity of a cover file is small, so a large cover file is needed to hide a substantial amount of data; and once data are hidden in an image or audio file, any lossy compression destroys the embedded data. It seems that such an image sh
cylinder
发表于 2025-3-23 09:17:28
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