encrypt-decrypt-backup

name	encrypt-decrypt-backup
description	This skill should be used when the user asks to "encrypt backup", "decrypt .bep file", "bitcoin-backup CLI", "backup wallet", "Touch ID password cache", "upgrade backup iterations", or needs to encrypt/decrypt BSV backup files using the bbackup CLI.
allowed-tools	Bash(bun:*)

Encrypt/Decrypt Backup

Encrypt and decrypt BSV backup files using the bitcoin-backup CLI (bbackup).

When to Use

• Encrypt wallet JSON to secure .bep backup file
• Decrypt .bep backup to read wallet data
• Create BAP identity backups
• Secure ordinals keys and payment keys
• Store sensitive BSV data encrypted at rest

Supported Backup Types

All backups use .bep format (AES-256-GCM encryption):

• BapMasterBackup - BAP identity (Type42 or Legacy)
• BapAccountBackup - Individual BAP account key
• WifBackup - Single private key
• OneSatBackup - Ordinals + Payment + Identity keys
• VaultBackup - Encrypted vault
• YoursWalletBackup - Yours Wallet format
• YoursWalletZipBackup - Yours Wallet ZIP format

Usage

Run the encrypt or decrypt scripts:

# Encrypt a wallet JSON file
bun run /path/to/skills/encrypt-decrypt-backup/scripts/encrypt.ts wallet.json output.bep

# Decrypt a backup file
bun run /path/to/skills/encrypt-decrypt-backup/scripts/decrypt.ts backup.bep

# Decrypt to specific output file
bun run /path/to/skills/encrypt-decrypt-backup/scripts/decrypt.ts backup.bep wallet.json

Flow's BSV Convention

This skill follows agent's BSV backup convention:

Storage Location: /.flow/.bsv/

• backups/ - Encrypted .bep files
• temp/ - Temporary decrypted files (auto-cleanup)
• config.json - Backup registry

Security:

• Never hardcodes passwords
• 600k PBKDF2 iterations for strong encryption

Password Handling

Scripts accept passwords in two ways (priority order):

1. Command-line argument - Pass password directly for interactive use
2. Environment variable - Set BACKUP_PASSPHRASE for automation/CI

Requirements

• bbackup CLI installed globally: bun add -g bitcoin-backup

CLI Reference

The bitcoin-backup CLI provides four commands:

• bbackup enc <input> -p <password> -o <output> - Encrypt JSON to .bep
• bbackup dec <input> -p <password> -o <output> - Decrypt .bep to JSON
• bbackup upg <input> -p <password> -o <output> - Upgrade legacy backups
• bbackup forget <file> - Remove cached Touch ID password

Touch ID Password Caching (macOS arm64)

On Apple Silicon Macs, bbackup can cache passwords in the Secure Enclave via @1sat/vault:

• bbackup enc backup.json -o backup.bep --touchid — encrypt and cache the password
• bbackup dec backup.bep --touchid — decrypt using cached password (Touch ID prompt)
• bbackup forget backup.bep — remove cached password

Requires macOS arm64 with Xcode Command Line Tools. Cached passwords are hardware-bound and cannot be extracted.

Error Handling

• Password too short (min 8 chars) - Returns error
• Invalid backup structure - Validation error
• Wrong password - Decryption fails with error
• Auto-detects backup type and iteration count