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The Internet checksum, [1] [2] also called the IPv4 header checksum is a checksum used in version 4 of the Internet Protocol (IPv4) to detect corruption in the header of IPv4 packets. It is carried in the IP packet header , and represents the 16-bit result of summation of the header words.
A checksum is a small-sized block of data derived from another block of digital data for the purpose of detecting errors that may have been introduced during its transmission or storage. By themselves, checksums are often used to verify data integrity but are not relied upon to verify data authenticity .
BSD checksum (Unix) 16 bits sum with circular rotation SYSV checksum (Unix) 16 bits sum with circular rotation sum8 8 bits sum Internet Checksum: 16 bits sum (ones' complement) sum24 24 bits sum sum32 32 bits sum fletcher-4: 4 bits sum fletcher-8: 8 bits sum fletcher-16: 16 bits sum fletcher-32: 32 bits sum Adler-32: 32 bits sum xor8: 8 bits ...
Often confused to be a CRC, but actually a checksum; see Fletcher's checksum: CRC-17-CAN CAN FD [51] 0x1685B 0x1B42D 0x1685B 0x1B42D even CRC-21-CAN CAN FD [51] 0x102899 0x132281 0x064503 0x18144C even CRC-24 FlexRay [39] 0x5D6DCB 0xD3B6BA 0xA76D75 0xAEB6E5 even
If the checksum calculation results in the value zero (all 16 bits 0) it should be sent as the ones' complement (all 1s) as a zero-value checksum indicates no checksum has been calculated. [7] In this case, any specific processing is not required at the receiver, because all 0s and all 1s are equal to zero in 1's complement arithmetic.
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How To Make My 3-Ingredient Macaroons. For about 24 macaroons, you’ll need: 4 large egg whites. 1/2 cup (100 grams) granulated sugar. 1 1/2 teaspoons vanilla extract, optional
The final digit of a Universal Product Code, International Article Number, Global Location Number or Global Trade Item Number is a check digit computed as follows: [3] [4]. Add the digits in the odd-numbered positions from the left (first, third, fifth, etc.—not including the check digit) together and multiply by three.