Security related aspects of databases and database access.

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Indexing encrypted data for efficient searching

I have implemented encryption for certain columns in a database. In some cases it may be necessary to search by these columns, either for exact matches or for substrings. At the moment, there is less ...
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When should a password be hashed? [duplicate]

I develop a Smartphone App and have a little question: When should I hash the user passwords, on the device or upload them in plain text and hash them on the server before stored in the database?