FNR : Arbitrary length small domain block cipher proposal
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FNR : Arbitrary length small domain block cipher proposal
We propose a practical flexible (or arbitrary) length small domain block cipher, .... Overview Input plaintext is subjected to PwIP to get a uniformly distributed ...
FNR : Arbitrary length small domain block cipher proposal Sashank Dara and Scott Fluhrer Cisco Systems, Inc, 170 West Tasman Drive, San Jose, CA 95314 {sadara,sfluhrer}@cisco.com
Abstract. We propose a practical flexible (or arbitrary) length small domain block cipher, FNR encryption scheme. FNR denotes Flexible Naor and Reingold. It can cipher small domain data formats like IPv4, Port numbers, MAC Addresses, Credit card numbers, any random short strings while preserving their input length. In addition to the classic Feistel networks, Naor and Reingold propose usage of Pair-wise independent permutation (PwIP) functions based on Galois Field GF(2n ). Instead we propose usage of random N ×N Invertible matrices in GF(2).
There is a compelling need for privacy of sensitive fields before data is shared with any cloud provider, semi-trusted vendors, partners etc. Network telemetry data, transaction logs etc. are often required to be shared for benefiting from variety of Software-as-Service applications like security monitoring etc. Such sensitive data fields are of well defined data formats like NetFlow, IPFIX etc. For example Port(16), IPv4(32), MAC (48) , IPv6 (128) etc. While designing privacy for sensitive fields, it may be desirable to preserve the length of the inputs, in order to avoid any re-engineering of packet formats or database columns of existing systems. Traditional AES-128/256 encryption would encrypt plaintext (of any smaller lengths) to result in a 128 bit ciphertext with the aid of padding. Expansion of ciphertext length may be undesirable for said reasons. Small domain block ciphers are useful tool in designing privacy of sensitive data fields of smaller length (
