hoakley General, Macs, Technology

Solutions to Saturday Mac riddles 317

I hope that you enjoyed Saturday’s Mac Riddles, episode 317. Here are my solutions to them.

1: Total banker’s order quickly verifies integrity.

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checksum

Total (a sum) banker’s order (a check or cheque) quickly verifies integrity (what it does).

2: 1 broke by 2005, 2 is still cryptographic, 3 is even better, but not in Iran.

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SHA

1 broke by 2005 (when SHA-1 was broken), 2 is still cryptographic (SHA-2 is), 3 is even better (although still little-used, it’s the strongest), but not in Iran (the last Shah of Iran was deposed in 1979).

3: Missing from …MNOPQTUVW… but present in CD.

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R-S

Missing from …MNOPQTUVW… (the letters RS) but present in CD (R-S codes were introduced by Irving S Reed and Gustave Solomon in 1960, and in 1978-80 were incorporated into Compact Discs to correct burst errors when reading).

The common factor

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They are methods to check for and, in the case of 3, correct errors in data.

I look forward to your putting alternative cases.