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Что (кто) такое altered checksum - определение
32-BIT HASH ALGORITHM USED TO DETECT ACCIDENTAL DATA CORRUPTION
Adler32; Adler checksum; Adlers checksum; ADLER32; Adler 32
checksum
![Effect of a typical checksum function (the Unix<code>[[cksum]]</code> utility)](https://commons.wikimedia.org/wiki/Special:FilePath/Checksum.svg?width=200 "Effect of a typical checksum function (the Unix<code>[[cksum]]</code> utility)")
SMALL-SIZE DATUM COMPUTED FROM AN ARBITRARY BLOCK OF DIGITAL DATA FOR THE PURPOSE OF DETECTING ERRORS
Check sum; Check-sum; Checksums; Integrity check value; Checksun; ICV - Integrity Check Value; Checksum algorithm; Header checksum; Modular sum; Fuzzy checksum; Checksum function
<storage, communications> A computed value which depends on
the contents of a block of data and which is transmitted or
stored along with the data in order to detect corruption of
the data. The receiving system recomputes the checksum based
upon the received data and compares this value with the one
sent with the data. If the two values are the same, the
receiver has some confidence that the data was received
correctly.
The checksum may be 8 bits (modulo 256 sum), 16, 32, or some
other size. It is computed by summing the bytes or words of
the data block ignoring overflow. The checksum may be
negated so that the total of the data words plus the checksum
is zero.
Internet packets use a 32-bit checksum.
See also digital signature, cyclic redundancy check.
(1996-03-01)
Checksum
SMALL-SIZE DATUM COMPUTED FROM AN ARBITRARY BLOCK OF DIGITAL DATA FOR THE PURPOSE OF DETECTING ERRORS
Check sum; Check-sum; Checksums; Integrity check value; Checksun; ICV - Integrity Check Value; Checksum algorithm; Header checksum; Modular sum; Fuzzy checksum; Checksum function
A checksum is a small-sized block of data derived from another block of digital data for the purpose of detecting errors that may have been introduced during its transmission or storage. By themselves, checksums are often used to verify data integrity but are not relied upon to verify data authenticity.
Википедия
Adler-32
Adler-32 is a checksum algorithm written by Mark Adler in 1995, modifying Fletcher's checksum. Compared to a cyclic redundancy check of the same length, it trades reliability for speed. Adler-32 is more reliable than Fletcher-16, and slightly less reliable than Fletcher-32.
