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YubiKey-Guide
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Bump Debian version, license year

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drduh 4 years ago
parent 2fc50760db
commit 2c2cec316c
2 changed files with 33 additions and 9 deletions
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2
LICENSE
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@ -1,6 +1,6 @@
The MIT License (MIT)
Copyright (c) 2016-2019 drduh
Copyright (c) 2016-2020 drduh
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal

40
README.md
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@ -86,7 +86,7 @@ Depending on your threat model and/or level of inherent trust in your own system
To use Debian, download the latest image:
```console
$ curl -LfO https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/debian-live-10.2.0-amd64-xfce.iso
$ curl -LfO https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/debian-live-10.3.0-amd64-xfce.iso
$ curl -LfO https://cdimage.debian.org/debian-cd/current-live/amd64/iso-hybrid/SHA512SUMS
@ -97,18 +97,17 @@ Verify the signature of the hashes file with GPG:
```console
$ gpg --verify SHA512SUMS.sign SHA512SUMS
gpg: Signature made Sat Nov 16 18:49:18 2019 PST
gpg: Signature made Sat Feb 8 18:02:16 2020 PST
gpg: using RSA key DF9B9C49EAA9298432589D76DA87E80D6294BE9B
gpg: Can't check signature: No public key
$ gpg --keyserver hkps://keyring.debian.org --recv DF9B9C49EAA9298432589D76DA87E80D6294BE9B
gpg: key 0xDA87E80D6294BE9B: 5 signatures not checked due to missing keys
gpg: key 0xDA87E80D6294BE9B: public key "Debian CD signing key <debian-cd@lists.debian.org>" imported
gpg: Total number processed: 1
gpg: imported: 1
$ gpg --verify SHA512SUMS.sign SHA512SUMS
gpg: Signature made Sat Nov 16 18:49:18 2019 PST
gpg: Signature made Sat Feb 8 18:02:16 2020 PST
gpg: using RSA key DF9B9C49EAA9298432589D76DA87E80D6294BE9B
gpg: Good signature from "Debian CD signing key <debian-cd@lists.debian.org>" [unknown]
gpg: WARNING: This key is not certified with a trusted signature!
@ -125,8 +124,8 @@ $ gpg --keyserver hkps://keyserver.ubuntu.com:443 --recv DF9B9C49EAA9298432589D7
Ensure the SHA512 hash of the live image matches the one in the signed file.
```console
$ grep $(sha512sum debian-live-10.2.0-amd64-xfce.iso) SHA512SUMS
SHA512SUMS:b253e347bf04c4e16b4c948b88bfba58f6084717f8ca290d5ea320837f63cf69b46734b7127dabd114ad88022075020982434fcf31463b82c6225671e7116a4d debian-live-10.2.0-amd64-xfce.iso
$ grep $(sha512sum debian-live-10.3.0-amd64-xfce.iso) SHA512SUMS
SHA512SUMS:c6adede144eb32b7316b65342f7445cb13b95ef17551d47ce1a8468d3954710f5f68c979c1086aa1b94262c8bfd86679eb38b01731c7b9aaeaca690455f1ff7f debian-live-10.3.0-amd64-xfce.iso
```
See [Verifying authenticity of Debian CDs](https://www.debian.org/CD/verify) for more information.
@ -148,7 +147,7 @@ sd 2:0:0:0: [sdb] Write cache: disabled, read cache: enabled, doesn't support DP
sdb: sdb1 sdb2
sd 2:0:0:0: [sdb] Attached SCSI removable disk
$ sudo dd if=debian-live-10.2.0-amd64-xfce.iso of=/dev/sdb bs=4M; sync
$ sudo dd if=debian-live-10.3.0-amd64-xfce.iso of=/dev/sdb bs=4M; sync
465+1 records in
465+1 records out
1951432704 bytes (2.0 GB, 1.8 GiB) copied, 42.8543 s, 45.5 MB/s
@ -161,7 +160,7 @@ $ dmesg | tail -n2
sd2 at scsibus4 targ 1 lun 0: <TS-RDF5, SD Transcend, TS3A> SCSI4 0/direct removable serial.0000000000000
sd2: 15193MB, 512 bytes/sector, 31116288 sectors
$ doas dd if=debian-live-10.2.0-amd64-xfce.iso of=/dev/rsd2c bs=4m
$ doas dd if=debian-live-10.3.0-amd64-xfce.iso of=/dev/rsd2c bs=4m
465+1 records in
465+1 records out
1951432704 bytes transferred in 139.125 secs (14026448 bytes/sec)
@ -1570,6 +1569,31 @@ Primary key fingerprint: 011C E16B D45B 27A5 5BA8 776D FF3E 7D88 647E BCDB
Subkey fingerprint: 07AA 7735 E502 C5EB E09E B8B0 BECF A3C1 AE19 1D15
```
Use a [shell function](https://github.com/drduh/config/blob/master/zshrc) to make encrypting files easier:
```
secret () {
output=~/"${1}".$(date +%s).enc
gpg --encrypt --armor --output ${output} -r 0x0000 -r 0x0001 -r 0x0002 "${1}" && echo "${1} -> ${output}"
}
reveal () {
output=$(echo "${1}" | rev | cut -c16- | rev)
gpg --decrypt --output ${output} "${1}" && echo "${1} -> ${output}"
}
```
```console
$ secret document.pdf
document.pdf -> document.pdf.1580000000.enc
$ reveal document.pdf.1580000000.enc
gpg: anonymous recipient; trying secret key 0xFF3E7D88647EBCDB ...
gpg: okay, we are the anonymous recipient.
gpg: encrypted with RSA key, ID 0x0000000000000000
document.pdf.1580000000.enc -> document.pdf
```
# Rotating keys
PGP does not provide forward secrecy - a compromised key may be used to decrypt all past messages. Although keys stored on YubiKey are difficult to steal, it is not impossible - the key and PIN could be taken, or a vulnerability may be discovered in key hardware or random number generator used to create them, for example. Therefore, it is good practice to occassionally rotate sub-keys.

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