What is CRC32?
The CRC is acronym for "Cyclic Redundancy Code" and 32
represent the length of checksum in bits. The "CRC" term is reserved for
algorithms that are based on the "polynomial" division idea. The idea to
compute the checksum is equal for all CRC algorithms: Take the data as a
VERY long binary number and divide it by a constant divisor. If you do this
with integer values you get a rest; this rest is the CRC checksum (for
example 7 / 3 = 2 + rest 1 => 1 is the checksum of 8. CRC is a
family of algorithms and CRC32 is one certain member of this family
(other members are CRC16, XMODEM,...); CRC32 produces a checksum with
a length of 32 Bit (= 4Byte).
What is the "checksum"?
The checksum is a number that has been calculated as a function
of some message. The literal interpretation of the "Check-Sum" word
indicates that the function should make simply adding up the bytes in
the message. Probably so was in the first checksum algorithms. Today,
however, more sophisticated algorithms is used, but term "checksum" is
What is the "message"?
The message in this context mean the input data, which will being
checksummed. This usually is any sequence of bytes.
What is Advanced CheckSum Verifier (ACSV)?
The Advanced CheckSum Verifier is an small,
GUI-driven Windows checksum utility
intended for creation and verification the
both in SFV and MD5SUM formats.
ACSV will help Windows users to protect the integrity of their files by
using the CRC32 or MD5
checksum calculation algorithms.
ACSV will useful when necessary to verify the accuracy of files burned to
CD-R(W) or transmitted over network, or for files comparison, or for
detection of corrupted or tampered files. Adding an little checksum file to
your data files will allow easily to verify their integrity at any time in
further and allow you to reveal what files has been changed.
ACSV is especially effective if you have many files, many subdirectories,
or both. And it's extremely fast and lightweight.
ACSV uses checksum files fully compatible with popular
md5 utility for
SFV (Simple File Verification) for
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