Reply to post:

French hacker besmuts road sign right under Les Plods' noses

Cynic_999 Silver badge

As an article in a tech publication, it should have mentioned how messages are sent to the sign so we can understand the hack. My guess would be that the sign is updated by an unencrypted FSK VHF radio signal (easy to spoof with an SDR and laptop), or from a standard pager message - getting the pager number is not that difficult.

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