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http://csrc.nist.gov/publications/nistpubs/800-38C/SP800-38C.pdf

SP 800-38C, Recommendation for Block Cipher Modes of Operation: the CCM Mode for Authentication and Confidentiality | CSRC You are viewing this page in an unauthorized frame window. This is a potential security issue, you are being redirected to https://csrc.nist.gov . Official w…

https://en.wikipedia.org/wiki/M-209

Mechanical cipher machine The M-209 In cryptography , the M-209 , designated CSP-1500 by the United States Navy ( C-38 by the manufacturer) is a portable, mechanical cipher machine used by the US military primarily in World War II , though it remained in active use through the Ko…

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

…rd, or phrase by reading it as a number , or sometimes by using an alphanumeric cipher . The letters of the alphabets involved have standard numerical values, but a word can yield several values if a cipher is used. According to Aristotle (384–322 BCE), isopsephy , based on the G…