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2. Ring signature - Wikipedia

   en.wikipedia.org/wiki/Ring_signature

   In cryptography, a ring signature is a type of digital signature that can be performed by any member of a set of users that each have keys. Therefore, a message signed with a ring signature is endorsed by someone in a particular set of people.

3. Keyring (cryptography) - Wikipedia

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

   This cryptography-related article is a stub. You can help Wikipedia by expanding it.

4. Cryptographic key types - Wikipedia

   en.wikipedia.org/wiki/Cryptographic_key_types

   One key might be used to start an automobile, while another might be used to open a safe deposit box. The automobile key will not work to open the safe deposit box and vice versa. This analogy provides some insight on how cryptographic key types work. These keys are categorized in respect to how they are used and what properties they possess.

5. Non-commutative cryptography - Wikipedia

   en.wikipedia.org/wiki/Non-commutative_cryptography

   One of the earliest applications of a non-commutative algebraic structure for cryptographic purposes was the use of braid groups to develop cryptographic protocols. Later several other non-commutative structures like Thompson groups , polycyclic groups , Grigorchuk groups , and matrix groups have been identified as potential candidates for ...

6. Keychain - Wikipedia

   en.wikipedia.org/wiki/Keychain

   A key can be added to a keyring by forcing an end of the loop open and sliding the key along the spiral. A keyring or "split ring" is a circle cotter that holds keys and other small items sometimes connected to keychains. Other types of keyrings are made of leather, wood and rubber.

7. Secret decoder ring - Wikipedia

   en.wikipedia.org/wiki/Secret_decoder_ring

   A secret decoder ring (or secret decoder) is a device that allows one to decode a simple substitution cipher—or to encrypt a message by working in the opposite direction. [ 1 ] As inexpensive toys, secret decoders have often been used as promotional items by retailers, as well as radio and television programs, from the 1930s through to the ...