Ryan S.
Ryan S.
Security engineer | Blockchain Developer

Blog specialized on Security, Crypto and blockchain.

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2026 © Ryan S.

    ML-DSA — The Module-Lattice Digital Signature Standard (FIPS 204)

    ML-DSA — The Module-Lattice Digital Signature Standard (FIPS 204)

    How ML-DSA (FIPS 204) builds a post-quantum digital signature from module lattices, the Fiat-Shamir with Aborts construction, rejection sampling, and the three NIST parameter sets.

    2026, Jun 29   —  19 minute read
    Linux Isolation Primitives - Defense in Depth Beyond the Castle Model

    Linux Isolation Primitives - Defense in Depth Beyond the Castle Model

    A technical survey of Linux isolation primitives (mount options, chroot, netfilter, cgroups, namespaces) and how they compose into containers, hypervisors, and Qubes OS as defense in depth.

    2026, Jun 29   —  14 minute read
    GNU/Linux Base Security Primitives - Authentication, Permissions, ACLs, Attributes, Capabilities

    GNU/Linux Base Security Primitives - Authentication, Permissions, ACLs, Attributes, Capabilities

    A technical walkthrough of the base GNU/Linux security primitives - login and authentication, POSIX file permissions, ACLs, extended attributes, and capabilities - with their adversary models and trade-offs.

    2026, Jun 29   —  13 minute read
    GNU/Linux from the Adversary's Side - Buffer Overflows, the Boot Chain, and a Real Attack

    GNU/Linux from the Adversary's Side - Buffer Overflows, the Boot Chain, and a Real Attack

    Testing GNU/Linux security by bypassing its primitives - stack buffer overflows and their mitigations, the boot chain under a physical adversary, and a remote attack from web exploit to root.

    2026, Jun 29   —  10 minute read
    Advanced GNU/Linux Security - SECCOMP and Linux Security Modules (LSM)

    Advanced GNU/Linux Security - SECCOMP and Linux Security Modules (LSM)

    How SECCOMP filters system calls and how Linux Security Modules (SELinux, AppArmor, and others) add mandatory access control on top of the base UNIX permission model.

    2026, Jun 29   —  13 minute read
    The Chinese Remainder Theorem and its Cryptographic Applications

    The Chinese Remainder Theorem and its Cryptographic Applications

    How the Chinese Remainder Theorem works, why it defines a ring isomorphism, and how it accelerates RSA signatures and explains square roots modulo a composite.

    2026, Jun 28   —  9 minute read
    Zero-Knowledge Proof Vulnerabilities — A Technical Classification of Soundness, Completeness, and Protocol Failures

    Zero-Knowledge Proof Vulnerabilities — A Technical Classification of Soundness, Completeness, and Protocol Failures

    A technical classification of zero-knowledge proof vulnerabilities covering trusted setup failures, Fiat-Shamir binding errors, under-constrained witnesses, verification bypasses, field arithmetic wraparound and protocol boundary gaps.

    2026, Jun 19   —  34 minute read
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