enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Affine cipher - Wikipedia

    en.wikipedia.org/wiki/Affine_cipher

    The affine cipher is a type of monoalphabetic substitution cipher, where each letter in an alphabet is mapped to its numeric equivalent, encrypted using a simple mathematical function, and converted back to a letter. The formula used means that each letter encrypts to one other letter, and back again, meaning the cipher is essentially a ...

  3. Public-key cryptography - Wikipedia

    en.wikipedia.org/wiki/Public-key_cryptography

    The shared secret can be used, for instance, as the key for a symmetric cipher, which will be, in essentially all cases, much faster. In an asymmetric key encryption scheme, anyone can encrypt messages using a public key, but only the holder of the paired private key can decrypt such a message.

  4. Differential cryptanalysis - Wikipedia

    en.wikipedia.org/wiki/Differential_cryptanalysis

    Differential cryptanalysis is a general form of cryptanalysis applicable primarily to block ciphers, but also to stream ciphers and cryptographic hash functions. In the broadest sense, it is the study of how differences in information input can affect the resultant difference at the output.

  5. Deniable encryption - Wikipedia

    en.wikipedia.org/wiki/Deniable_encryption

    She constructs a cipher-text C out of both messages, M1 and M2, and emails it to Carl. Carl uses his key to decrypt M2 (and possibly M1, in order to read the fake message, too). Bob finds out about the email to Carl, becomes suspicious and forces Alice to decrypt the message. Alice uses the sacrificial key and reveals the innocuous message M1 ...

  6. Known-plaintext attack - Wikipedia

    en.wikipedia.org/wiki/Known-plaintext_attack

    Classical ciphers are typically vulnerable to known-plaintext attack. For example, a Caesar cipher can be solved using a single letter of corresponding plaintext and ciphertext to decrypt entirely. A general monoalphabetic substitution cipher needs several character pairs and some guessing if there are fewer than 26 distinct pairs.

  7. Linear cryptanalysis - Wikipedia

    en.wikipedia.org/wiki/Linear_cryptanalysis

    In cryptography, linear cryptanalysis is a general form of cryptanalysis based on finding affine approximations to the action of a cipher. Attacks have been developed for block ciphers and stream ciphers. Linear cryptanalysis is one of the two most widely used attacks on block ciphers; the other being differential cryptanalysis.

  8. Atbash - Wikipedia

    en.wikipedia.org/wiki/Atbash

    The Atbash cipher can be seen as a special case of the affine cipher. Under the standard affine convention, an alphabet of m letters is mapped to the numbers 0, 1, ... , m − 1. (The Hebrew alphabet has m = 22, and the standard Latin alphabet has m = 26). The Atbash cipher may then be enciphered and deciphered using the encryption function for ...

  9. Chosen-plaintext attack - Wikipedia

    en.wikipedia.org/wiki/Chosen-plaintext_attack

    The following attack on a one-time pad allows full recovery of the secret key. Suppose the message length and key length are equal to n. The adversary sends a string consisting of n zeroes to the oracle. The oracle returns the bitwise exclusive-or of the key with the string of zeroes. The string returned by the oracle is the secret key.