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Message: [QUOTE="Arne Vajhøj, post: 5051389"] That type of attack is called a known plaintext attack. The most common symmetric encryption algorithm AES should not be vulnerable to that. But as previous stated then I only consider that second best solution. DES operates on 8 byte blocks and AES on 16 byte blocks. For data that is not a multipla of that padding is required. But I would suggest AES and padding. In many databases INTEGER is only 32 bit. 64 bit is called BIGINT or something similar. Arne [/QUOTE]