Add encrypted Switchboard Bench transfer snapshot

README.md

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+---
+pretty_name: Switchboard Bench Encrypted Transfer
+tags:
+- encrypted-archive
+- benchmark
+- agent-trajectories
+---
+
+# Switchboard Bench encrypted transfer
+
+This repository is a transport surface, not a public dataset release. It
+contains only an encrypted snapshot of the private Switchboard Bench research
+archive plus integrity metadata. The plaintext dataset and its decryption
+passphrase are not stored in this repository.
+
+The intended recipient should obtain the passphrase through a separately
+authenticated channel. Anyone without that passphrase can download the
+ciphertext but cannot inspect the packaged tasks, trajectories, analyses, or
+labels.
+
+## Download and verify
+
+```bash
+uvx --from huggingface_hub hf download \
+  exgenesis/switchboard-bench-transfer \
+  switchboard-bench-private-20260806.tar.gz.gpg \
+  switchboard-bench-private-20260806.tar.gz.gpg.sha256 \
+  transfer-manifest.json \
+  --repo-type dataset \
+  --local-dir .
+
+shasum -a 256 -c switchboard-bench-private-20260806.tar.gz.gpg.sha256
+```
+
+Compare the reported SHA-256 with the value sent through the separate secure
+channel as well as `transfer-manifest.json`.
+
+## Decrypt and extract
+
+Install GnuPG, then run:
+
+```bash
+gpg --decrypt switchboard-bench-private-20260806.tar.gz.gpg |
+  tar -xzf -
+```
+
+GnuPG will prompt for the passphrase. Successful extraction creates
+`switchboard-bench-private-20260806/`, whose own README, data dictionary,
+package manifest, per-file checksums, and validation report document the
+contents.
+
+## Security boundary
+
+The repository name, archive size, upload time, checksum, and ciphertext are
+public. Confidentiality depends on keeping the passphrase private. If the
+passphrase is disclosed later, previously downloaded copies can also be
+decrypted; deleting this repository cannot revoke those copies.

switchboard-bench-private-20260806.tar.gz.gpg

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+version https://git-lfs.github.com/spec/v1
+oid sha256:518b8c206c0cedb4ff1d15298a60171d9903ec0789545935cbaa521134355e09
+size 2744004001

switchboard-bench-private-20260806.tar.gz.gpg.sha256

@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:33c596781d8907f625e429b6dd9343ab89e6c3d453c5a60968206c80330d185c
+size 112

transfer-manifest.json

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+{
+  "created_at_utc": "2026-08-08T16:12:20Z",
+  "source": {
+    "directory": "switchboard-bench-private-20260806",
+    "regular_files": 52594,
+    "logical_bytes": 8382114909,
+    "validation_sha256": "7eccb555345dffb6c467bbf41d5260356e8b3ef5644921deee2a84f0369e2b39"
+  },
+  "artifact": {
+    "path": "switchboard-bench-private-20260806.tar.gz.gpg",
+    "bytes": 2744004001,
+    "sha256": "518b8c206c0cedb4ff1d15298a60171d9903ec0789545935cbaa521134355e09",
+    "format": "gzip-compressed POSIX tar encrypted with GnuPG symmetric AES-256"
+  },
+  "verification": {
+    "source_validation_passed": true,
+    "ciphertext_checksum_passed": true,
+    "decrypt_and_tar_listing_passed": true
+  },
+  "key_handling": {
+    "local_store": "macOS Keychain",
+    "service": "switchboard-bench-transfer-20260808",
+    "embedded_in_artifact_or_repository": false
+  }
+}