General data security principles, such as in the CIA triad of confidentiality, integrity, and availability, require that all three states must be adequately protected.
Deleting data at rest on storage media such as backup tapes, data stored in the cloud, computers, phones, or multi-function printers can present challenges when confidentiality of information is of concern.
Data security is largely influenced by confidentiality and privacy concerns.
This renders all user data on the device cryptographically inaccessible, in a very short amount of time.
The security issues listed here are not specific to crypto-shredding, and in general these may apply to all types of data encryption.