Recommendation for Block Cipher Modes of Operation: Methods for Format-Preserving Encryption

Format Controlling Encryption Using Datatype Preserving Encryption

Datatype­Preserving Encryption (DTP) enables encryption of values within a certain character set into ciphertext restricted to the same set, while still keeping data length. This is in contrast to conventional block cipher modes which produce binary data, i e each encrypted character may have an arbitrary value, possibly outside the original character set, often accompanied with a length expans...

The Role of Latin Square in Cipher Systems: A Matrix Approach to Model Encryption Modes of Operation

This paper studies the theoretic background of cryptographic modes of operation, in particular those modes proposed to ensure message privacy. A novel algebraic model is presented as an archetype of encryption design. In the ideal case, encrypting multiple messages is treated as inductively applying the algebraic operation F, an operation corresponding to block-by-block processing, on Latin Squ...

A Pseudo-Random Encryption Mode

Block ciphers are length-preserving private-key encryption schemes. I.e., the private key of a block-cipher determines a permutation on strings of the length of its input. This permutation is used for encryption while the inverse permutation is used for decryption. Using a length-preserving encryption scheme saves on memory and prevents wasting communication bandwidth. Furthermore, it enables t...

Elastic Block Ciphers

We introduce the new concept of elastic block ciphers, symmetrickey encryption algorithms that (1) for a variable-size input do not expand the plaintext (i.e., do not require plaintext padding) and (2) adjust their computational load proportionally to the size increase. Contrary to stream ciphers, elastic block ciphers maintain the diffusion property and non-synchronicity of traditional block c...

Recommendation for Block Cipher Modes of Operation: The RMAC Authentication Mode Methods and Techniques