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  2. Symmetric-key algorithm - Wikipedia

    en.wikipedia.org/wiki/Symmetric-key_algorithm

    Symmetric-key encryption: the same key is used for both encryption and decryption. Symmetric-key algorithms [a] are algorithms for cryptography that use the same cryptographic keys for both the encryption of plaintext and the decryption of ciphertext. The keys may be identical, or there may be a simple transformation to go between the two keys. [1]

  3. Key (cryptography) - Wikipedia

    en.wikipedia.org/wiki/Key_(cryptography)

    A key in cryptography is a piece of information, usually a string of numbers or letters that are stored in a file, which, when processed through a cryptographic algorithm, can encode or decode cryptographic data. Based on the used method, the key can be different sizes and varieties, but in all cases, the strength of the encryption relies on ...

  4. Cryptographic key types - Wikipedia

    en.wikipedia.org/wiki/Cryptographic_key_types

    Symmetric authorization key Symmetric authorization keys are used to provide privileges to an entity using a symmetric cryptographic method. The authorization key is known by the entity responsible for monitoring and granting access privileges for authorized entities and by the entity seeking access to resources.

  5. Cryptography - Wikipedia

    en.wikipedia.org/wiki/Cryptography

    Symmetric-key cryptography, where a single key is used for both encryption and decryption. Symmetric-key cryptography refers to encryption methods in which both the sender and receiver share the same key (or, less commonly, in which their keys are different, but related in an easily computable way).

  6. Diffie–Hellman key exchange - Wikipedia

    en.wikipedia.org/wiki/Diffie–Hellman_key_exchange

    With Diffie–Hellman key exchange, two parties arrive at a common secret key, without passing the common secret key across the public channel. Diffie–Hellman ( DH ) key exchange [ nb 1 ] is a mathematical method of securely generating a symmetric cryptographic key over a public channel and was one of the first public-key protocols as ...

  7. Key authentication - Wikipedia

    en.wikipedia.org/wiki/Key_authentication

    For key authentication using the traditional symmetric key cryptography, this is the problem of assuring that there is no man-in-the-middle attacker who is trying to read or spoof the communication. There are various algorithms used now-a-days to prevent such attacks.

  8. Key exchange - Wikipedia

    en.wikipedia.org/wiki/Key_exchange

    Historically, before the invention of public-key cryptography (asymmetrical cryptography), symmetric-key cryptography utilized a single key to encrypt and decrypt messages. For two parties to communicate confidentially, they must first exchange the secret key so that each party is able to encrypt messages before sending, and decrypt received ones.

  9. Key generation - Wikipedia

    en.wikipedia.org/wiki/Key_generation

    Symmetric-key algorithms use a single shared key; keeping data secret requires keeping this key secret. Public-key algorithms use a public key and a private key. The public key is made available to anyone (often by means of a digital certificate). A sender encrypts data with the receiver's public key; only the holder of the private key can ...