By Jean Goubault-Larrecq (auth.), Anupam Datta (eds.)

This e-book constitutes the refereed court cases of the thirteenth Asian Computing technological know-how convention, ASIAN 2009, held in Seoul, Korea, in December 2009.

The 7 revised complete papers and three revised brief papers provided including 2 invited talks have been rigorously reviewed and chosen from forty five submissions. concentrating on the idea and perform of data defense and privateness, the papers contain issues of deducibility constraints, symmetric encryption modes, dynamic safety domain names and regulations, cryptography, formal verification of quantum courses, selection of static equivalence, authenticated message and proxy signature scheme.

**Read or Download Advances in Computer Science - ASIAN 2009. Information Security and Privacy: 13th Asian Computing Science Conference, Seoul, Korea, December 14-16, 2009. Proceedings PDF**

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**Additional resources for Advances in Computer Science - ASIAN 2009. Information Security and Privacy: 13th Asian Computing Science Conference, Seoul, Korea, December 14-16, 2009. Proceedings**

**Example text**

Related Work: Security of symmetric encryption modes have been studied for a long time by the cryptographers. In [1] the authors presented diﬀerent concrete security notions for symmetric encryption in a concrete security framework. For instance, they give a security analysis of CBC mode. In [2] a security analysis of the encryption mode CBC-MAC [21]. In [26] they propose a new encryption mode called OCB for eﬃcient authenticated encryption and provide a security analysis of this new mode. Many other works present proofs of encryption modes.

We do not provide rules for the commands x := E −1 (y) or x := y[n, m] since those commands are only used during decryption. Notation: For a set V , we write V, x as a shorthand for V ∪ {x}, V − x as a shorthand for V \ {x}, and Indis(νx) as a shorthand for Indis(νx; Var). Random Assignment: $ – (R1) {true} x ← − U {F (x) ∧ Indis(νx) ∧ E(E, x)} $ – (R2) {Indis(νy; V )} x ← − U {Indis(νy; V, x)} Increment: – (I1) {F (y)} x := y + 1 {RCounter(x) ∧ E(E, x)} – (I2) {RCounter(y)} x := y + 1 {RCounter(x) ∧ E(E, x)} – (I3) {Indis(νz; V )} x := y + 1 {Indis(νz; V − x)} if z = x, y and y ∈ V Xor operator: – (X1) {Indis(νy; V, y, z)}x := y ⊕ z{Indis(νx; V, x, z)} where x, y, z ∈ V , – (X2) {Indis(νy; V, x)}x := y ⊕ z{Indis(νy; V )} where x ∈ V , – (X3) {Indis(νt; V, y, z)} x := y ⊕ z {Indis(νt; V, x, y, z)} if t = x, y, z and x, y, z ∈ V – (X4) {F (y)} x := y ⊕ z {E(E, x)} if y = z Concatenation: – (C1) {Indis(νy; V, y, z)} ∧ {Indis(νz; V, y, z)} x := y z {Indis(νx; V, x)} if y, z ∈ V – (C2) {Indis(νt; V, y, z)} x := y z {Indis(νt; V, x, y, z)} if t = x, y, z Block cipher: – (B1) {E(E, y)} x := E(y) {F (x) ∧ Indis(νx) ∧ E(E, x)} – (B2) {E(E, y) ∧ Indis(νz; V )} x := E(y) {Indis(νz; V )} provided z = x Automated Security Proof for Symmetric Encryption Modes 47 – (B3) {E(E, y) ∧ Rcounter(z)} x := E(z) {Rcounter(z)} provided z = x – (B4) {E(E, y) ∧ E(E, z)} x := E(y) {E(E, z)} provided z = x, y – (B5) {E(E, y) ∧ F (z)} x := E(y) {F (z)} provided z = x, y Finally, we add a few rules whose purpose is to preserve invariants that are unaﬀected by the command.

If D is a constraint system that is uniquely determined and σ ∈ Sol(D), then there is a solved deducibility constraint D such that D ∗ D and σ ∈ Sol(D ). We assume that mgu(E ∪ θ) = ⊥. F∧H v1 ∧ . . ∧ H vm where: v1 . . vm w1 . . wn is a decomposition or a versatile rule such that w Max(R) ⊆ {w1 , . . , wn } and x ˜ = var (R); – θ = mgu( w, w1 , . . , wn , v, u1 , . . , un ), u1 , . . , un ∈ st(H) X , and v ∈ X ; – H is a left member of a deducibility constraint in A such that H H; – mgu(E ∪ θ) = ⊥ and lev(x, A ∧ H v) < lev(H, A ∧ H v) for any x ∈ var (v).