Tuesday, August 13, 2019

Is it legal to decrypt signals that are passively receivable?

First I'd like to point out I'm not certain if this is the right place for this question, I couldn't find a better place to ask.

My question is - if Alice were to send an encrypted message to Bob over the air (lets just say using WiFi), would MaliciousMan be breaking any U.S. laws by also receiving the data and decrypting it? MaliciousMan would have absolutely no active involvement, simply receive the message and use something locally to decrypt it. (of course we are being theoretical, assuming MaliciousMan has somehow managed to procure the ability to decrypt within a reasonable time frame AES, SSL and/or whatever else.) Imagining Alice and Bob to be, for example, your grandma logging into her online banking.



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