According to Kario, the attack is also applicable to other interfaces that perform RSA decryption in an automated manner such as S/MIME, JSON web tokens, or hardware tokens.

Developed in the late 1970s, RSA-based key exchange is the most common technique, which involves generating two public keys – an encryption key and a decryption key.

RSA is a public-key encryption algorithm used to encrypt and decrypt data. It relies on two different but linked keys: a public key for encryption and a private key for decryption.

Security researchers have successfully broken one of the most secure encryption algorithms, 4096-bit RSA, by listening -- yes, with a microphone -- to a computer as it decrypts some encrypted data ...