CRC32 Visual Basic code for crc-32 checksum calculation - look at CRC32 Tester.

The CRC32 algorithm is a reliable way of checking whether an error has occurred in a sequence of bytes. There are various means of checking whether any bytes have been corrupted, for example, checksums and parity bits, but many simple schemes run a reasonably high chance of failing to detect an error depending on the type of corruption to the data that occurs. With CRC the chances of a corruption occurring which results in the same CRC are extremely remote.
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About crc32 checksum function:

From Wikipedia, the free encyclopedia

A cyclic redundancy check (CRC) is a type of hash function used to produce a checksum, which is a small number of bits, from a large block of data, such as a packet of network traffic or a block of a computer file, in order to detect errors in transmission or storage. A CRC is computed and appended before transmission or storage, and verified afterwards to confirm that no changes occurred. CRCs are popular because they are simple to implement in binary hardware, are easy to analyze mathematically, and are particularly good at detecting common errors caused by noise in transmission channels. CRCs are based on division in a commutative ring, namely the ring of polynomials over the integers modulo 2. In simpler terms, this is the set of polynomials where each coefficient is only one bit, and arithmetic operations wrap around. Any string of bits can be interpreted as the coefficients of a polynomial of this sort, and to find the CRC, we divide by another fixed polynomial. The coefficients of the remainder polynomial are the CRC, and there are simple, efficient algorithms for computing this remainder, such as the one shown below. CRCs are often referred to as "checksums," but such designations are not strictly accurate since, technically, a checksum is calculated through addition, not division. While useful for error detection, CRCs cannot be safely relied upon to verify data integrity (that no changes whatsoever have occurred), since, because of the linear structure of CRC polynomials, it is extremely easy to intentionally change data without modifying its CRC.

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