produced by Classmethod

# セキュリティ articles

サイバーセキュリティの基礎知識から最新動向、対策事例まで、セキュリティに関する実践的な情報を発信しています。組織のセキュリティ強化に役立つ知見が満載です。

A Story About Getting Stuck on Signature Verification for Twilio ConversationRelay WebSocket Communication

越井琢巳 (Koshii Takumi)

2026.08.15

A Story About Testing an IP-Restricted Environment with Claude in Chrome and FoxyProxy

越井琢巳 (Koshii Takumi)

2026.08.14

Claude Code v2.1.230 to v2.1.232 Major Updates - Sub-agent Fork Defaults and Cross-session Mentions

2026.08.14

LLM Watermarking: How It Works and Its Limitations

2026.08.13

注目の記事

Claude Code Self-Hosted Environment Feature Arrives: Trying an EC2 Instance as the Execution Environment

かずえ@製造BT

2026.08.12

Claude Code v2.1.225~v2.1.226 Major Updates - SendMessage Cross-Machine Origin Support and Authentication-Related Fixes

2026.08.08

Claude Code v2.1.224 Major Updates - Self-Hosted Environments and Inter-Session Messaging

2026.08.07

Claude Code v2.1.223 Major Updates - Permission Bypass Fix and /review Integration into /code-review

2026.08.06

Claude Code v2.1.222 Major Updates - Security fix for worktree isolation and removal of ultraplan

2026.08.05

Reducing Prompt Injection Risk with GitHub MCP Lockdown Mode

2026.08.05

Claude Code v2.1.220 to v2.1.221 Major Updates - Print Mode MCP Connection Fix and Permission Check Bypass Fix

2026.08.04

I tried the new IAM Policy Simulator feature "PolicyExclusionList"

2026.08.01

I tried the new AWS WAF feature "Parsed Text Transformation" using the CLI

2026.07.31

Use GitHub MCP in Read-only mode

2026.07.27

I tried the new Claude Code feature, the locally self-contained vulnerability scanner "Claude Security Plugin"

2026.07.26

The default cooldown period for Dependabot version updates is now 3 days.

2026.07.25

I tried the new Lambda Durable Functions feature "Encryption of Durable Execution Data"

2026.07.23

I tried Dynamic Label Interpolation with AWS WAF to test dynamic forwarding of bot information and custom block pages

2026.07.22

Claude Code v2.1.215 to v2.1.216 Major Updates - Addition of sandbox settings and faster long sessions

2026.07.21

I tried the new "UserIdentity filtering" feature of CloudTrail Network Activity Events

2026.07.21

I checked the ETag and SHA-256 of a file uploaded to S3 using multipart upload

越井琢巳 (Koshii Takumi)

2026.07.21

ちょっと話題の記事

I attempted to reproduce the nginx vulnerability reported in July 2026 (CVE-2026-42533) in Docker

2026.07.20

I checked the results of operating AWS WAF Anti-DDoS managed rules on CloudFront for one year

2026.07.18

Claude Code v2.1.213 to v2.1.214 Major Updates - Claude Fable 5 is now included in all Max and Team Premium plans, available at 50% of the limit

2026.07.18

[Update] Amazon GuardDuty Can Now Detect Misuse of Leaked Amazon ECS Credentials

2026.07.18

[Presentation Materials] I gave a presentation titled "Let's Think About How Risk Management Should Be in the AI Era" at the CCoE Practitioners Community Kansai.

荒平祐次(arap)

2026.07.17

Claude Code v2.1.212 Major Updates

2026.07.17

Prompt Injection Countermeasures in Amazon Q Custom Chat Agents

2026.07.17

[New Feature] Tried Specifying Password Hashes in Amazon Cognito CSV Import

2026.07.16

Main Updates in Claude Code v2.1.211

2026.07.16

Claude Code v2.1.209 to v2.1.210 Major Updates

2026.07.15

I tried automatically detecting AI assets with the new AWS Security Hub feature "AI Inventory"

2026.07.15

[Update] GuardDuty AI Protection, which enables threat detection for AI-related services, is now available in preview

2026.07.14

I tried out ECS_NO_ENVIRONMENT_SECRETS since 191 AWS Config managed rules were added

2026.07.10

I tried detecting actually reachable ports from the internet using the new AWS Security Hub feature "Network Scanning"

2026.07.10

"What Should OSS Developers Do Now? Thinking About Software Supply Chain Compromise Countermeasures" Participation Report #oss_supplychain

2026.07.09