Professor Lars Ramkilde Knudsen from DTU Compute has invented a new way to encrypt telephone conversations that makes it very difficult to ‘eavesdrop’. His invention can help to curb industrial espionage.
A method ensuring that all telephone calls are encrypted and that eavesdroppers are unable to decrypt information in order to obtain secrets. This is a brief definition of dynamic encryption, the brainchild of Professor Lars Ramkilde Knudsen from DTU. Together with telecommunications businessman Kaj Juul-Pedersen, he established the company Dencrypt, which sells dynamic encryption to businesses so they can safely exchange confidential information over the telephone.
“Today, all telephone conversations are encrypted—i.e. converted into gibberish—but they are not encrypted all the way from phone to phone, and if a third party has access to one of the telephone masts through which the call passes, they can listen in,” explains Lars Ramkilde Knudsen.
“And even if the conversation is encrypted—in principle—it is still possible to decrypt it provided you have sufficient computer power,” he says. This is in no small part due to the fact that the vast majority of telecommunications operators use the same encryption algorithm—the so-called AES, the outcome of a competition launched by the US government in 1997.
“This is where my invention comes in,” he says. It expands the AES algorithm with several layers which are never the same Dynamic encryption.
“When my phone calls you up, it selects a system on which to encrypt the conversation. Technically speaking, it adds more components to the known algorithm. The next time I call you, it chooses a different system and some new components. The clever thing about it is that your phone can decrypt the information without knowing which system you have chosen. It is as if the person you are communicating with is continually changing language and yet you still understand,” he says.
The Latest on: Dynamic encryption
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The Latest on: Dynamic encryption
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