(57) A database encryption system and method, the Structure Pre serving Database
Encryption (SPDE), is presented. In the SPDE method, each database cell is encrypted with …

A system, method, computer program product, and data management service that allows
any comparison operation to be applied on encrypted data, without first decrypting the …

5,848.404 A 12/1998 Hafmer et al. duced using the invention are sound and complete, the
inven 5,963,642 A 10/1999 Goldstein tion is robust against cryptanalysis, and its security …

Modern database systems store and retrieve vast quanti ties of information. Some of this
information is sensitive, Such as credit card numbers, bank balances, and nuclear secrets …

In a database, a frequently retrieved column is encrypted using a common key, and other
columns are encrypted using a speci? c roW key. Thus, a retrieving process can be per …

Encryption of non-relational? les is a Well-knoWn art in the? eld of cryptography. These
cryptosystems alloW a user to digitally encrypt information stored in a non-relational format …

Records in a secure database include attributes. A query homomorphically encrypts indices
identifying one record and attribute. A secret key is generated at a certain query count and is …

(57) ABSTRACT A definition tool of the present invention declares columns which are
concealed in external tables to a multi-database Server. The multi-database Server controls …

An encryption and decryption circuit and method using subkeys which is therefore
particularly useful for the encryption and decryption of database information. Each data field …

BACKGROUND Sensitive/confidential data may be entered by a user at a client computer.
For example, a doctor, nurse or even a medi cal receptionist may enter sensitive data such …