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conference paper
On Hiding a Plaintext Length by Preencryption
2011
Applied Cryptography and Network Security. ACNS 2011
It is a well known fact that encryption schemes can not hide a plaintext length when it is unbounded. We thus admit that an approximation of it may leak and we focus on hiding its precise value. Some standards such as TLS or SSH offer to do it by applying some pad-then-encrypt techniques. In this study, we investigate the information leakage when these techniques are used. We define the notion of padding scheme and its associated security. We show that when a padding length is uniformly distributed, the scheme is nearly optimal. We also show that the insecurity degrades linearly with the padding length.
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Name
lengthhiding-corrected.pdf
Access type
openaccess
Size
94.68 KB
Format
Adobe PDF
Checksum (MD5)
00b0a582b11897bee86b7ba586c91e56