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You searched for "Locks". Your search returned 29 results.

Eliminate the impossible

“When you have eliminated the impossible, whatever remains, however improbable, must be the truth” said Sherlock Holmes, in The Sign of Four, ch. 6 (1889). One of the ways to eliminate the impossible is to first enumerate everything that can be enumerated — probable or not. René Descartes said something similar. His last rule for … Continue reading

Riddle of the Sphinx

When is a riddle like a passcode? That’s not a riddle by the way. The Sphinx guarded the gate to the city of Thebes and required travellers to answer a riddle before gaining access to the city. Riddles are a bit like passcodes. They typically present as permutations, combination of elements, albeit for small numbers, … Continue reading

Unlocked

TOOOL stands for The Open Organisation Of Lockpickers. According to their website they’ll be holding a LockCon event in October 2019 in The Netherlands, which is where the organisation was founded. The organisation distances itself from criminal activity, i.e. breaking and entering. It provides instructions and runs competitions as a kind of “door hardware sport.” … Continue reading

Breaking and entering

A burgh is simply a town, usually with some kind of protection or fortification. Think also of a castle, a court or a manor house — and the related noun borough. In native English a burgh-breche was a break-in, now contracted to burglary, “The crime of breaking (formerly by night) into a house with intent to commit felony” (OED), … Continue reading

Encrypted city

Urban metaphors are powerful in the world of computing. The reverse is also true. Computing brings metaphors to bear on how we think of cities — as flows of data, networks, circuits, grids and an Internet of things, as if cities are made up of bits, memories (RAM), sensors, actuators, and with communication systems, inputs, … Continue reading

Romancing the blockchain

The blockchain idea is addictive for some. It’s technically fascinating, mysterious and counter-intuitive. It depends on cryptography to function, and inherits the fascination many of us have with cyphers and codes. Who can resist the lure of a secret message? The way blockchain platforms function also mystify with their abstruse methods and terminology: proof of … Continue reading

How smart are smart contracts?

Blockchain technologies such as bitcoin, support peer-to-peer monetary transactions, where lines in a shared ledger indicate payer, payee, date, amount and the goods or services to be exchanged: as is the case in a line in a bank statement. But, instead of a text line indicating  the product being exchanged, what if that line included … Continue reading

An anti-hacker puzzle

Following on from my previous post … Here’s a simple puzzle challenge. The SHA256 hashing algorithm (see earlier post: Immutable data) converts any string of text (integers or letters) into a (near) unique 64 character long string of numbers and letters. Using this algorithm the string “301253” (someone’s birthdate) translates to the string of characters … Continue reading

Why hackers have to work hard

A 4 digit mechanical combination lock is designed so that a person trying to break into your locker (a padlock hacker) would have to try on average 5,000 combinations (104/2). That’s about 2-5 hours work, which is a big investment in time, and before the hacker exhausts all iterations he or she may well be … Continue reading

Immutable data

An application on the exorbin.com website can convert any block of data into a near unique 64 character string of characters. Fun with SHA256 So “abc” converts to ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad My name, “Richard Coyne”, converts to ba7c5c9e90f05540084e798effd0389b60ec98677662017065d34a0b880778a7 Here’s some Shakespeare “To be, or not to be — that is the question: Whether ’tis nobler in the mind to … Continue reading

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