Initial commit - 611 cybersecurity skills across all subdomains

skills/implementing-digital-signatures-with-ed25519/references/workflows.md

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+# Workflows - Digital Signatures with Ed25519
+
+## Workflow 1: Key Generation and Storage
+
+```
+[Generate Ed25519 Key Pair]
+(32-byte private seed -> 32-byte public key)
+      |
+[Serialize Private Key (PKCS#8 PEM)]
+[Serialize Public Key (SubjectPublicKeyInfo PEM)]
+      |
+[Encrypt Private Key with Passphrase]
+      |
+[Store with Metadata]
+(key_id, fingerprint, creation_date)
+```
+
+## Workflow 2: Sign Document
+
+```
+[Document to Sign]
+      |
+[Load Private Key (decrypt passphrase)]
+      |
+[Ed25519 Sign]
+(deterministic: SHA-512 internal hash)
+      |
+[Output: 64-byte Signature]
+      |
+[Create Signature File]
+(signature + public key reference + metadata)
+```
+
+## Workflow 3: Verify Signature
+
+```
+[Document + Signature + Public Key]
+      |
+[Load Public Key]
+      |
+[Ed25519 Verify]
+      |
+[Valid?]
+  YES -> Accept document as authentic
+  NO  -> Reject (tampering detected)
+```
+
+## Workflow 4: Code Signing System
+
+```
+[Build Artifact] (binary, package, container)
+      |
+[Hash Artifact] (SHA-256)
+      |
+[Create Signing Manifest]
+(artifact_name, hash, timestamp, signer_id)
+      |
+[Sign Manifest with Ed25519]
+      |
+[Distribute: Artifact + Manifest + Signature + Public Key]
+      |
+[Recipient Verifies]:
+  1. Verify signature on manifest
+  2. Hash artifact and compare to manifest
+  3. Check signer identity against trust store
+```