Format-preserving encryption (FPE) encrypts a plaintext of some specified format into a ciphertext of identical format—for example, encrypting a valid credit-card number into a valid credit-card number. The problem has been known for some time, but it has lacked a fully general and rigorous treatment.

We introduce identity-based format-preserving encryption (IB-FPE) as a way to localize and limit the damage to format-preserving encryption (FPE) from key exposure. We give de nitions, relations between them, generic attacks and two transforms of FPE schemes to IB-FPE schemes.

We propose a novel small-domain pseudo-random permuta-tion, also referred to as a small-domain cipher or small-domain (deterministic) encryption. We prove that our con-struction achieves \strong security", i.e., is indistinguishable from a random permutation even when an adversary has observed all possible input-output pairs.

2012年1月20日 · When explaining the encryption modes, it mainly analyzes the construction features of FPE modes or schemes, introduces the principles of three classical modes, summarizes the different types of...

We investigate the natural ap-proach for achieving FPE on complex domains, the “rank-then-encipher” approach, and explore what it can and cannot do. We describe two fla-vors of unbalanced Feistel networks that can be used for achieving FPE, and we prove new security results for each.

You encrypt CCN X with key K and tweak T by letting Y = EK (X), where N = len (X). Security notions. We define multiple notions of security for FPE schemes. Our strongest adapts the traditional PRP notion to capture the idea that FPE is a good approximation for a family of uniform permutations on the slices.

2012年8月1日 · This paper presents FPE (Format-preserving Encryption) for character data in both fixed-width and variable-width encoding. Previous researches only studied FPE for fixed-width character data....

2023年12月1日 · Thumbnail-preserving encryption (TPE) can balance the usability and the privacy of images in the cloud. Most ideal TPE schemes obtain thumbnails by dividing the plaintext image into multiple blocks, and then perform …

We introduce identity-based format-preserving encryption (IB-FPE) as a way to localize and limit the damage to format-preserving en-cryption (FPE) from key exposure. We give definitions, relations be-tween them, generic attacks and two transforms of FPE …

Format-Preserving Encryption (FPE). The FPE uses a derived pool S of Sboxes. Given an L-bit key K, a tweak tweak, a format specified by the parameters a and l, the parameters m and n, the selected cipher suite algo = (PRNG1, PRNG2, PRF), and an input pt Zl a, we define