Several techniques can be used to efficiently implement a Hamming coder for single-bit error correction and double-bit error detection.

The most common type uses Hamming codes, which can correct one error and detect two errors. This “single-error-correct, double-error-detect” approach is often abbreviated SECDED.

If it is sensitive, it must be encrypted, and inevitable errors in noisy transmission channels must be detected and corrected. Hamming’s wrestling match with punched-card equipment has led to a ...