implementing-digital-signatures-with-ed25519
Ed25519 is a high-performance digital signature algorithm using the Edwards curve Curve25519. It provides 128-bit security with 64-byte signatures and 32-byte keys, offering significant advantages ove
Best use case
implementing-digital-signatures-with-ed25519 is best used when you need a repeatable AI agent workflow instead of a one-off prompt.
Ed25519 is a high-performance digital signature algorithm using the Edwards curve Curve25519. It provides 128-bit security with 64-byte signatures and 32-byte keys, offering significant advantages ove
Teams using implementing-digital-signatures-with-ed25519 should expect a more consistent output, faster repeated execution, less prompt rewriting.
When to use this skill
- You want a reusable workflow that can be run more than once with consistent structure.
When not to use this skill
- You only need a quick one-off answer and do not need a reusable workflow.
- You cannot install or maintain the underlying files, dependencies, or repository context.
Installation
Claude Code / Cursor / Codex
Manual Installation
- Download SKILL.md from GitHub
- Place it in
.claude/skills/implementing-digital-signatures-with-ed25519/SKILL.mdinside your project - Restart your AI agent — it will auto-discover the skill
How implementing-digital-signatures-with-ed25519 Compares
| Feature / Agent | implementing-digital-signatures-with-ed25519 | Standard Approach |
|---|---|---|
| Platform Support | Not specified | Limited / Varies |
| Context Awareness | High | Baseline |
| Installation Complexity | Unknown | N/A |
Frequently Asked Questions
What does this skill do?
Ed25519 is a high-performance digital signature algorithm using the Edwards curve Curve25519. It provides 128-bit security with 64-byte signatures and 32-byte keys, offering significant advantages ove
Where can I find the source code?
You can find the source code on GitHub using the link provided at the top of the page.
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SKILL.md Source
# Implementing Digital Signatures with Ed25519 ## Overview Ed25519 is a high-performance digital signature algorithm using the Edwards curve Curve25519. It provides 128-bit security with 64-byte signatures and 32-byte keys, offering significant advantages over RSA and ECDSA including deterministic signatures (no random nonce needed), resistance to side-channel attacks, and fast verification. This skill covers implementing Ed25519 for document signing, code signing, and API authentication. ## When to Use - When deploying or configuring implementing digital signatures with ed25519 capabilities in your environment - When establishing security controls aligned to compliance requirements - When building or improving security architecture for this domain - When conducting security assessments that require this implementation ## Prerequisites - Familiarity with cryptography concepts and tools - Access to a test or lab environment for safe execution - Python 3.8+ with required dependencies installed - Appropriate authorization for any testing activities ## Objectives - Generate Ed25519 key pairs for signing - Sign messages and files with Ed25519 - Verify signatures against public keys - Implement multi-signature verification - Build a simple code signing system - Compare Ed25519 performance with RSA and ECDSA ## Key Concepts ### Ed25519 vs RSA vs ECDSA | Property | Ed25519 | RSA-3072 | ECDSA P-256 | |----------|---------|----------|-------------| | Security | 128-bit | 128-bit | 128-bit | | Public key size | 32 bytes | 384 bytes | 64 bytes | | Signature size | 64 bytes | 384 bytes | 64 bytes | | Key generation | ~50 us | ~100 ms | ~1 ms | | Sign | ~70 us | ~5 ms | ~200 us | | Verify | ~200 us | ~200 us | ~500 us | | Deterministic | Yes | No (PSS) | No (unless RFC 6979) | ### Key Properties - **Deterministic**: Same message + key always produces same signature - **Collision-resistant**: No separate hash function needed - **Side-channel resistant**: Constant-time implementation - **Small keys**: 32 bytes each (public and private) ## Security Considerations - Ed25519 does not support key recovery from signatures - Verify the full message, not a hash (Ed25519 hashes internally) - Public keys must be validated before use (check for low-order points) - Private keys should be stored encrypted at rest - Ed25519 is not yet approved for all NIST use cases (Ed448 is preferred for federal) ## Validation Criteria - [ ] Key pair generation produces valid Ed25519 keys - [ ] Signature verification succeeds for valid message - [ ] Signature verification fails for tampered message - [ ] Signature verification fails for wrong public key - [ ] Deterministic: same input produces same signature - [ ] File signing and verification works correctly - [ ] Performance meets or exceeds RSA-3072
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