[PDF] Top 20 Counter-in-Tweak: Authenticated Encryption Modes for Tweakable Block Ciphers

... operating modes is that they provide only birthday-bound security with respect to the block length of the underlying ...existing block ciphers have block length at most 128 bits (in ... See full document

... online ciphers was put forward by Bellare, Boldyreva, Knudsen, and Namprempre ...online ciphers HCBC1 and HCBC2, both of which require the use of two keys, one for the underlying block cipher and the ... See full document

... Synthetic Counter in Tweak (SCT) [22], a beyond-birthday-bound (BBB) AE scheme based on a tweak- able block cipher under a single ...The encryption part is ... See full document

... a block cipher in a mode that does not use its inverse is a ...of block cipher-based functions that do not use the inverse mapping are counter mode encryption and any block cipher-based ... See full document

... as tweak and the latter n bits are XORed to both input and output of ...ideal tweakable cipher, XTX is secure for up to O(2 (n+t)/2 ) queries in the standard ...beyond-birthday-secure tweakable ... See full document

... the modes of operation in the ideal model do not have a direct connection with security analysis performed on the permutations, as is the case with block ciphers modes of ... See full document

... This type of lemma is usually proved by defining a large enough set of “good” keys, and then, for each choice of a good key, lower bounding the probability of observing this transcript, again by lower bounding the number ... See full document

... OCB-like modes: OCB ...AES-like tweakable block cipher ...new tweak/key-schedule that requires a smaller number of gates to evaluate when compared to AES (but with an additional 128-bit ... See full document

... other tweakable ciphers), that of building authenticated encryption with associated data (AEAD) [35] via a generalization of Bellare and Rogaway’s “encode-then- encipher” ...obtain ... See full document

... We remark that the use of Poly[m, m, m] for m = n/3 instead of Poly[n + m] can reduce the implementation size and gain efficiency. For example Aoki and Yasuda [3] proposed to use Poly[n/2, n/2] instead of Poly[n] used in ... See full document

... the block cipher is that of a pseudo-random permutation instead of a strong pseudo-random ...the block cipher is not required to be implemented leading to a smaller size ...of block ciphers ... See full document

... A block cipher is a family of permutations that is indexed via a secret ...While block ciphers are omnipresent in cryptographic permutations, they inherently lack flexibility and many applications of ... See full document

... the tweakable blockcipher from Chakraborty and Sarkar [19] to the permutation-based ...large block size would have been a severe obstruction, as observed in works by Yasuda and Sarkar [80,77], and some ... See full document

... Abstract. Tweakable block ciphers are increasingly becoming a common primitive to build new resilient modes as well as a concept for multiple dedicated ...regular block ciphers ... See full document

... 64-bit block involutive lightweight block cipher called I-PRESENT TM ...that encryption and decryption can be performed using the same circuit, thus providing savings on ...lightweight block ... See full document

... This solution is able to execute the encryption of one block within 19 clock cycles using 431 slices (3.24%) of the FPGA. This optimized solution is at the expense of the FPGA’s resources. It can be noted ... See full document

... Blowfish [17] developed by Bruce Schneier which is a 64-bit block cipher with Feistel structure and each round consists of a key-dependent permutation and a key and data dependent substitution. All operations are ... See full document

... Most of the security arguments and proofs offered for STRIBOBr1 and BLNK in [56] also apply to the new proposal. These are based on indistinguishably arguments for the π permutation and a simple theorem (Thm. 1, Sec. ... See full document

... The first way is by modifying nonce and last message block size. Chosen appropriately, we can ensure two COFFE instantiations with different nonce and different last message block size can have exactly the ... See full document

... Abstract: Cryptography is the science of secret codes. Previously we used DES algorithms in order to secure but cannot encrypt completely. Thus, we referred AES Algorithms to create a ciphertext in encryption and ... See full document