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Cosa (chi) è symmetric block cipher - definizione

CIPHER THAT WORKS ON FIXED-SIZE BLOCKS OF BITS

Codebook algorithm; Block ciphers; Block cyphers; Block crypto; Block cypher; Symmetric block cipher; Block Cipher; Tweakable block cipher; ARX cipher

Block cipher

In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called blocks. They are specified elementary components in the design of many cryptographic protocols and are widely used to encrypt large amounts of data, including in data exchange protocols. It uses blocks as an unvarying transformation.

https://en.wikipedia.org/wiki/Block_cipher

symmetric key cryptography

ALGORITHM

Symmetric Algorithms; Symmetric key; Symmetric encryption; Symmetric key cryptography; Symmetric cypher; Shared key; Symmetric cipher; Symmetric-key cipher; Symmetric key algorithms; Symmetric cryptography; Private-key cryptography; Symmetric key encryption; Symmetric key algorithm; Reciprocal cipher; Reciprocal encipherment; Private key cryptography; Symmetric-key encryption algorithm; Symmetric-key cryptography; Private-key; Symmetric algorithm; Private-key encryption; Symmetrical encryption

<cryptography> A cryptography system in which both parties have the same encryption key, as in {secret key cryptography}. Opposite: public-key cryptography. (1998-06-09)

private-key cryptography

ALGORITHM

Symmetric Algorithms; Symmetric key; Symmetric encryption; Symmetric key cryptography; Symmetric cypher; Shared key; Symmetric cipher; Symmetric-key cipher; Symmetric key algorithms; Symmetric cryptography; Private-key cryptography; Symmetric key encryption; Symmetric key algorithm; Reciprocal cipher; Reciprocal encipherment; Private key cryptography; Symmetric-key encryption algorithm; Symmetric-key cryptography; Private-key; Symmetric algorithm; Private-key encryption; Symmetrical encryption

<cryptography> As opposed to public-key cryptography, a cryptographic method in which the same key is used to encrypt and decrypt the message. Private-key algorithms include the obsolescent Data Encryption Standard (DES), triple-DES (3DES), the Advanced Encryption Standard (AES), also known as Rijndael, Blowfish, Twofish RC2, RC4, RC5 and RC6. A problem with private-key cryptography is that the sender and the recipient of the message must agree on a common key via some alternative secure channel. Public-key cryptography gives an answer to this problem. (2008-02-07)

Wikipedia

Block cipher

In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called blocks. Block ciphers are specified elementary components in the design of many cryptographic protocols and are widely used to encrypt large amounts of data, including in data exchange protocols. A block cipher uses blocks as an unvarying transformation.

Even a secure block cipher is suitable for the encryption of only a single block of data at a time, using a fixed key. A multitude of modes of operation has been designed to allow their repeated use in a secure way to achieve the security goals of confidentiality and authenticity. However, block ciphers may also feature as building blocks in other cryptographic protocols, such as universal hash functions and pseudorandom number generators.

https://en.wikipedia.org/wiki/Block cipher