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2. Substitution cipher - Wikipedia

   en.wikipedia.org/wiki/Substitution_cipher

   t. e. In cryptography, a substitution cipher is a method of encrypting in which units of plaintext are replaced with the ciphertext, in a defined manner, with the help of a key; the "units" may be single letters (the most common), pairs of letters, triplets of letters, mixtures of the above, and so forth. The receiver deciphers the text by ...

3. Telephone keypad - Wikipedia

   en.wikipedia.org/wiki/Telephone_keypad

   A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s – this replaced rotary dialing, that had been developed for ...

4. Key management - Wikipedia

   en.wikipedia.org/wiki/Key_management

   Key management. Key management refers to management of cryptographic keys in a cryptosystem. This includes dealing with the generation, exchange, storage, use, crypto-shredding (destruction) and replacement of keys. It includes cryptographic protocol design, key servers, user procedures, and other relevant protocols. [1][2]

5. British and American keyboards - Wikipedia

   en.wikipedia.org/wiki/British_and_American_keyboards

   The UK keyboard has 1 more key than the U.S. keyboard (UK=62, US=61, on the typewriter keys, 102 v 101 including function and other keys, 105 vs 104 on models with Windows keys) The extra key is added next to the Enter key to accommodate # (number sign) and ~ (tilde) The Alt key to the right of the space bar is replaced by an AltGr key.

6. Electronic Key Management System - Wikipedia

   en.wikipedia.org/wiki/Electronic_Key_Management...

   The Electronic Key Management System (EKMS) is a United States National Security Agency led program responsible for Communications Security (COMSEC) key management, accounting, and distribution. Specifically, EKMS generates and distributes electronic key material for all NSA encryption systems whose keys are loaded using standard fill devices ...

7. Triple DES - Wikipedia

   en.wikipedia.org/wiki/Triple_DES

   Triple DES. In cryptography, Triple DES (3DES or TDES), officially the Triple Data Encryption Algorithm (TDEA or Triple DEA), is a symmetric-key block cipher, which applies the DES cipher algorithm three times to each data block. The 56-bit key of the Data Encryption Standard (DES) is no longer considered adequate in the face of modern ...