معنی md5-checksum توی rapidshare چیه؟

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سلام
جدیداً وقتی از rapidshare میخوام فایل دانلود کنم چه همچین چیزی میبینم:
You want to download abc.rar
MD5-checksum: 8A6A1E9870PFJP0390WJ13D010DE53

معنی خط دوم چیه؟

[K053_LSH_KV90]

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.
Internetpackets use a 32-bit checksum.

فقط همين رو داشتم بگم !!
MD5 هم يه نوع الگوريتم رمزنگاري هست

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بعداً توی راپید شیر شما تا حالا دیدی اینو؟