U.S. Senator Ron Wyden sent a letter to the National Institute of Standards and Technology (NIST) Director Walter G. Copan urging the agency to develop and issue standards as part of a guidance framework for securely sharing sensitive documents over the Internet. Wyden’s request was prompted by the widespread sharing of highly sensitive files packed as password-protected zip files via email in the government sector. Many of the people doing that this way the data is protected while in transit and after reaching the inbox. This is because many software programs that create.zip files use a weak encryption algorithm by default.
Source: https://www.bleepingcomputer.com/news/security/us-sen-wyden-asks-nist-to-create-secure-file-sharing-guide/