PeaZip can be used as duplicate files finder, or to spot differences
between two files, using its "File tools"
checksum and hash
PeaZip's "Check files
" tool in
"File tools" submenu can perform multiple, user selected hash
on multiple files at once.
This function supports
many algorithms ranging from fast checksums to cryptographically strong
hashes: Adler32, CRC family (CRC16, CRC24, CRC32, CRC64),
eDonkey/eMule, MD4, MD5, Ripemd160, SHA families (SHA1; SHA224, SHA256,
SHA384, SHA512), and Whirlpool512.
The algorithms to be performed can be selected in Options >
Settings, in File Tools tab.
Hint: Chose faster checksums like CRC32 to
perform a quick comparation to
detect duplicate files of test for casual corruption, but it is
recommended to switch to a cryptographically secure hash function (like
SHA 256, SHA512 or the AES-based Whirlpool512) to detect malicious
corruption attempt that might be calculated in order to pass undetected
to one (or some) of the non-secure algorithms.
Selected algorithms are performed in a single passage so reading the
disk (usually the main performance bottleneck) occours only one time.
Calculating file hash or checksum is useful in example to find
and to check
files for corruption
when an original
checksum or hash value is
Output value of hashes and checksums can be seen as exadecimal (HEX,
either LSB or MSB) or encoded as
Byte to byte file
" tools in
"File tools" submenu, instead,
performs byte to byte comparison between two files.
Unlike checksum or
hash based comparison, byte to byte comparison can spot exactly what
the different bytes and it is not susceptible of collisions under any
circumstance - even if this condition is highly ulikely if the chosen
algorithm is adequately strong for the scenario where it is intended to
Topics: find duplicate files, deduplicate files,
compare files, detect corrupted files, calculate checksum program,
cryptographically secure hash functions, compare files software,
freeware duplicate finder application, find duplicates, file hasing,