Whilst studying the material for the CCNAS exam, I have encountered something on the cryptographic systems chapter that I am not sure about. Cisco Netacad states that "Asymmetric algorithms use two keys: a public key and a private key. Both keys are capable of the encryption process, but the complementary matched key is required for decryption. For example, if a public key encrypts the data, the matching private key decrypts the data. The opposite is also true. If a private key encrypts the data, the corresponding public key decrypts the data.".
Can someone clarify whether the last statement made is correct; that if the private key encrypts the data then the corresponding public key decrypts the data. As far as I know this is not true?
Any clarification here would be appreciated!