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  2. Hexadecimal - Wikipedia

    en.wikipedia.org/wiki/Hexadecimal

    Hexadecimal (also known as base-16 or simply hex) is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 and "A"–"F" to represent values from ten to fifteen.

  3. Message authentication code - Wikipedia

    en.wikipedia.org/wiki/Message_authentication_code

    Formally, a message authentication code (MAC) system is a triple of efficient [4] algorithms (G, S, V) satisfying: G (key-generator) gives the key k on input 1 n , where n is the security parameter.

  4. Base64 - Wikipedia

    en.wikipedia.org/wiki/Base64

    If there are only two significant input octets (e.g., 'Ma'), or when the last input group contains only two octets, all 16 bits will be captured in the first three Base64 digits (18 bits); the two least significant bits of the last content-bearing 6-bit block will turn out to be zero, and discarded on decoding (along with the succeeding ...

  5. Binary-to-text encoding - Wikipedia

    en.wikipedia.org/wiki/Binary-to-text_encoding

    The 95 isprint codes 32 to 126 are known as the ASCII printable characters. Some older and today uncommon formats include BOO, BTOA , and USR encoding. Most of these encodings generate text containing only a subset of all ASCII printable characters: for example, the base64 encoding generates text that only contains upper case and lower case ...

  6. Format-preserving encryption - Wikipedia

    en.wikipedia.org/wiki/Format-preserving_encryption

    Section 8 of the FIPS 74, Federal Information Processing Standards Publication 1981 Guidelines for Implementing and Using the NBS Data Encryption Standard, [9] describes a way to use the DES encryption algorithm in a manner that preserves the format of the data via modulo-n addition followed by an unbiasing operation. This standard was ...

  7. SHA-1 - Wikipedia

    en.wikipedia.org/wiki/SHA-1

    The number hh is the message digest, which can be written in hexadecimal (base 16). The chosen constant values used in the algorithm were assumed to be nothing up my sleeve numbers: The four round constants k are 2 30 times the square roots of 2, 3, 5 and 10. However they were incorrectly rounded to the nearest integer instead of being rounded ...

  8. Derived unique key per transaction - Wikipedia

    en.wikipedia.org/wiki/Derived_unique_key_per...

    Also, it is common practice in the industry to use only 64-bits of the KSN (probably for reasons pertinent to legacy systems, and DES encryption), which would imply that the full KSN is padded to the left with four ‘f’ hex digits. The remaining 4 hex digits (16-bits) are available, nonetheless, to systems which can accommodate them.

  9. Cocks IBE scheme - Wikipedia

    en.wikipedia.org/wiki/Cocks_IBE_scheme

    Cocks IBE scheme is an identity based encryption system proposed by Clifford Cocks in 2001. [1] The security of the scheme is based on the hardness of the quadratic residuosity problem . Protocol