What is Message Digest?
A message digest is a compact digital signature for an arbitrarily long
stream of binary data. An ideal message digest algorithm would never
generate the same signature for two different sets of input, but achieving
such theoretical perfection would require a message digest as long as the
input file. Practical message digest algorithms compromise in favour of a
digital signature of modest and usually fixed size created with an algorithm
designed to make preparation of input text with a given signature
Message digest algorithms have much in common with techniques used in
encryption, but to a different end; verification that data have not been
altered since the signature was published.
On the other hand, they also have some in common with 16 or 32 bit cyclical
redundancy codes (CRC) originally developed to verify correct transmission
in data communication protocols, but these short codes, while adequate to
detect the kind of transmission errors for which they were intended, are
insufficiently secure for modern volumes of the data and for applications
such as electronic commerce and verification of security related software
The most commonly used present-day message digest algorithm is the 128 bit
MD5 algorithm, developed by Ron Rivest of the MIT Laboratory for Computer
Science and RSA Data Security, Inc. The algorithm, with a reference
implementation, was published as Internet RFC 1321 in April 1992, and was
placed into the public domain at that time.
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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