However, digital signatures guarantee only integrity. Digital signing is not
intended to keep the data private.* It simply ensures that the data is not tampered
with during transit.
5.2.2 Locate the Public Key
Public keys may be distributed in many ways, but for email only four methods are
available:
1. Public keys may be given to a recipient out-of-band, as, for example, by delivery
of a floppy disk containing the public keys. Using an out-of-band method, the
public keys may be stored long before the email is sent.
2. Public keys may be embedded in a message. Typically, they are located in the
header part of a message as part of a special header. For example:
X-Public-Key: c3NoLWRzcyBBQUFBQjNOemFDMWtjM01BQUFDQkFKOTh2MXloQVp
VWjBYM3ZMUVhiemVwY1hienkvdnh6T1NEN3E0a25Ed3loSWFoYm
dLclMzK2RIV3hzOUErSTRrV2YrODlBLzMzU3VGOCtBOFdwUTc2W
ld2K2JHMUZiUzg0WW5XeWtNUlY3Z3NzY2VlQUs4OXM2ZDcvSlR3
VDhiZi9OVTFlT2hvWUdjamJONFBHVHhHajB1bW9nWlBaRiswdEZ
SMm45b3hVcFpBQUFBRlFDdGpUUVBCS016cXM1Y0QxZVAydXJEZX
NXSERRQUFBSUFwMEg5dG9YZ21yekJJdjN0aUtVWWcrN0JvSndsW
HdWTnNiR1lPcVlzdWpxUlZKUWQ0SXRlcVo1WVo2VG5Rbk5DZUho
V2tjVFNPa3NFcVhsemlIemtudS9pRUp4MTloQnlYaXFzYmlQQ2V
ZRU1pZUp2Z2crWWZVQTlXb0QwWk00bEs2VHhKUTB2U09PV3E0Yn
ZFYzNCMzI3ZGh6dS9QaGNqenNNLzMzQ05pVHdBQUFJQXNMWVduU
HFMNnVkNFR0RTRFYXIyVXBaQ282WEg1ZDk2cVRHNHhUdlpLMnpl
NTVyRi9Rc1pXNVdod2ZvYkhRWmM5WlRRZzdMeFRtSFhDZmVHT1U
3eGhrTGpPUTJqMVB0ZXlYd2FTUVpiek1ITU8zaW10ejNwdVB4Vn
J5a0owTVc0NHdPd1VzbWRvSElqOE5Za094QmNzU1FLUzN6NTdXb
0VOSnZKbFZuSjBjdz09IGJjeEBsYWR5Cg==
* To ensure privacy, the message or channel carrying the message would need to be encrypted.
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