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- Rodolphe Lampe, Jacques Patarin, Yannick Seurin
- ASIACRYPT
- 2012

We analyze the security of the iterated Even-Mansour cipher (a.k.a. key-alternating cipher), a very simple and natural construction of a blockcipher in the random permutation model. This construction, first considered by Even and Mansour (J. Cryptology, 1997) with a single permutation, was recently generalized to use t permutations in the work of Bogdanov… (More)

- Rodolphe Lampe, Yannick Seurin
- IACR Cryptology ePrint Archive
- 2013

We consider tweakable blockciphers with beyond the birthday bound security. Landecker, Shrimpton, and Terashima (CRYPTO 2012) gave the first construction with security up to O(22n/3) adversarial queries (n denotes the block size in bits of the underlying blockcipher), and for which changing the tweak does not require changing the keys for blockcipher calls.… (More)

- S I McDonough, R A Lampe, R A Keith, B P Bean
- Molecular pharmacology
- 1997

We studied the mechanism by which the peptide omega-grammotoxin-SIA inhibits voltage-dependent calcium channels. Grammotoxin at concentrations of > 50 nM completely inhibited inward current carried by 2 mM barium through P-type channels in rat cerebellar Purkinje neurons when current was elicited by depolarizations up to +40 mV. However, outward current… (More)

omega-Grammotoxin SIA, a peptidergic blocker of voltage-sensitive calcium channel (VSCC) responses, was purified from Grammostola spatulata (tarantula spider) venom by reverse phase high performance liquid chromatography. Protease-sensitive biological activity was monitored by determining the inhibition of K(+)-stimulated influx of 45Ca2+ into rat brain… (More)

- Rodolphe Lampe, Yannick Seurin
- IACR Cryptology ePrint Archive
- 2013

We show how to construct an ideal cipher with n-bit blocks and n-bit keys (i.e. a set of 2 public n-bit permutations) from a small constant number of n-bit random public permutations. The construction that we consider is the single-key iterated Even-Mansour cipher, which encrypts a plaintext x ∈ {0, 1} under a key k ∈ {0, 1} by alternatively xoring the key… (More)

- Shan Chen, Rodolphe Lampe, Jooyoung Lee, Yannick Seurin, John P. Steinberger
- IACR Cryptology ePrint Archive
- 2014

The r-round (iterated) Even-Mansour cipher (also known as key-alternating cipher) defines a block cipher from r fixed public n-bit permutations P1, . . . , Pr as follows: given a sequence of n-bit round keys k0, . . . , kr, an n-bit plaintext x is encrypted by xoring round key k0, applying permutation P1, xoring round key k1, etc. The (strong)… (More)

- Rodolphe Lampe, Yannick Seurin
- FSE
- 2014

We study the security of key-alternating Feistel ciphers, a class of key-alternating ciphers with a Feistel structure. Alternatively, this may be viewed as the study of Feistel ciphers where the pseudorandom round functions are of the form Fi(x⊕ ki), where ki is the (secret) round key and Fi is a public random function that the adversary is allowed to query… (More)

- T J Turner, R A Lampe, K Dunlap
- Molecular pharmacology
- 1995

The peptide Ca2+ channel antagonists omega-conotoxin (omega-CTX) MVIIC and omega-grammotoxin (omega-GTX) SIA were studied by measuring their effects on the release of [3H]glutamate from rat brain synaptosomes. The pseudo-first-order association constant for omega-CTX MVIIC (1.1 x 10(4) M-1 sec-1) was small, relative to that for omega-GTX SIA (3.6 x 10(5)… (More)

- R A Keith, T J Mangano, R A Lampe, P A DeFeo, M J Hyde, B A Donzanti
- Neuropharmacology
- 1995

The effects of synthetic omega-grammotoxin SIA (omega-GsTxSIA) and synthetic omega-Aga-IVA were tested in in vitro and in vivo neurochemical assays that are reflective of voltage-sensitive calcium channel function. Synthetic omega-GsTx SIA inhibited K(+)-evoked rat and chick synaptosomal 45Ca2+ flux, K(+)-evoked release of [3H]D-aspartate and… (More)

- Benoit Cogliati, Rodolphe Lampe, Yannick Seurin
- CRYPTO
- 2015

We study how to construct efficient tweakable block ciphers in the Random Permutation model, where all parties have access to public random permutation oracles. We propose a construction that combines, more efficiently than by mere black-box composition, the CLRW construction (which turns a traditional block cipher into a tweakable block cipher) of… (More)