From Computerphile.

Malleable encryption means you can flip a bit in the encrypted message and the corresponding bit is flipped in the unencrypted plain text. Dr Tim Muller gives us some examples.

nb This video is a reupload due to an audio problem with the first version. For those interested there were tones at approx 2.1k and then at approx 5.5k & 9k – guessing computer fan noise as there were a couple of occasions where it changed frequency slightly possibly as it sped up or slowed down.

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This video was filmed and edited by Sean Riley.

Computerphile is a sister project to Brady Haran’s Numberphile. More at https://www.bradyharanblog.com