Difference Between CRC and Checksum

When data is stored in a computer for transmission, it must be ensured that it is not destroyed. If faulty data is given, incorrect data will be sent, and the system may not function properly.

Therefore, before encryption or transmission, an error detection system is required to ensure that every data provided is accurate and has not been destroyed.

The two most commonly used methods for data verification are CRC and Checksum.

CRC vs Checksum

The main difference between CRC and Checksum is that In order to check for data anomalies, CRC uses a mathematical formula based on 16-bit or 32-bit encoding instead of using an 8-byte checksum. CRC uses a hashing method, but the Checksum uses the addition of all truncated data, which maybe 8 or 16 bits long. Consequently, CRC has a better ability to detect data problems, such as the loss of a single bit in the hashing system that causes the entire result to change.

CRC vs Checksum

The cyclic redundancy check, or CRC as it is widely known, is a notion that is also used in data validation.

The working principle of CRC is the same as that of Checksum, but instead of using the 8-byte method used by Checksum to verify data integrity, it uses polynomial division to calculate CRC.

The most typical CRC length is 16 or 32 bits. If a single byte is missing, the data will be reported as inconsistent because it is not added to the original data.

Checksums are one of the earliest ways to verify data before it is delivered. The Checksum also helps data verification because the original data and the input data must match.

If an abnormality is found, that is, the Checksum is incorrect, it indicates that the data breach may have occurred in a specific way.

Comparison Table Between CRC and Checksum

Parameters of ComparisonCRCChecksum
ConceptCRC is a comprehensive concept for error detection and reporting.It is not a comprehensive idea for error detection and reporting.
DetectIt is capable of identifying mistakes with double digits.It can detect even the tiniest little change in data.
ErrorsIt can identify more mistakes due to complicated calculations.It is capable of calculating a less amount of mistakes than CRC.
UsedIt is extensively used for data validation in analog transmission.It’s commonly used for data validation during software development.
ApproachIt employs a method of hash.It employs a method of addition.

What is CRC?

CRC stands for Cyclic Redundancy Check, which is an error detection mechanism used by high-level protocols to identify errors.

The polynomial generator exists at the sender and receiver at the same time.

CRCs are similar to checksums in principle, but the value of the CRC, which is 16 or 32 bits long, is determined via polynomial division.

The advantage of CRC is that it is quite accurate. If a single bit is wrong, the CRC value will not match.

Both Checksum and CRC are effective at eliminating random transmission mistakes, but they offer no protection against a deliberate attack on your data.

Techniques like symmetric and public-key encryption are far more secure. All of these procedures work together to provide you the tools you need to protect the security of the information you transmit and receive over the Internet.

In fact, transferring data through a computer network is frequently safer than sending it any other way. Eavesdropping is possible on phones, especially cordless phones, by unscrupulous persons using radio scanners.

Traditional mail and other tangible mediums frequently travel through several hands-on their journey to their intended recipient, raising the risk of corruption.

What is Checksum?

IT professionals use checksums to identify high-level mistakes in data transfers. A checksum is a value that reflects the number of bits in a transmission message.

After performing a cryptographic hash function on each piece of data or file before transmission, a checksum value can be assigned. The word Checksum is also known as a hash value or hash sum.

Checksums operate by providing information about the transmission to the person on the receiving end, ensuring that the entire range of data is transmitted.

The checksum value is generally a lengthy string of letters and numbers that acts as a kind of fingerprint for a file or group of files, indicating the number of bits present in the file or set of files.

If the end user’s checksum value differs even slightly from the file’s original checksum value, it can notify all parties involved in the transmission that the file has been damaged or tampered with by a third party.

The recipient can then look into what went wrong or attempt downloading the file again. The transmission control protocol (TCP) and the user diagram protocol are two typical methods for determining checksum numbers (UDP).

TCP is usually more reliable for tracking sent data packets, while UDP might be useful for avoiding transmission delays.

Main Differences Between CRC and Checksum

  1. The Checksum is not a comprehensive idea for error detection and reporting, whereas CRC is a comprehensive concept for error detection and reporting.
  2. The Checksum can detect even the tiniest little change in data, whereas CRC is capable of identifying mistakes with double digits.
  3. The Checksum is capable of calculating a less amount of mistakes than CRC, whereas CRC can identify more mistakes due to complicated calculations.
  4. A checksum is commonly used for data validation during software development. CRC is extensively used for data validation in analog transmission.
  5. The Checksum is based on the addition method, whereas CRC is based on the hash method.


A checksum is a fixed number of bits added to data that is computed as a function of the data to be safeguarded. The function is recomputed to identify mistakes, and the result is compared to the value appended to the data.

The simplest checksum implementation is to partition the data into chunks of the same length and make exclusive-or of all pieces.

The cyclic redundancy check technique takes advantage of cyclic codes’ mathematical characteristics. In terms of error detection and reporting, CRC is more comprehensive than Checksum.

The older of the two applications is Checksum. Besides Checksum, CRC requires a more complicated calculation. Checksums are used to identify single-bit data changes, whereas CRCs are used to verify and detect double-digit mistakes.

Due to its more complex purpose, CRC may identify more errors than checksums. When implementing software, checksums are mostly used for data validation. In analog data transmission, CRC is mainly used for data evaluation.


  1. https://link.springer.com/chapter/10.1007/978-3-540-75101-4_32
  2. https://www.scientific.net/AMM.599-601.1548
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