A SHA-1 digest looks like an byte of apparently random bytes, though they are completely repeatable. You need to armour it if you want to make it printable for transporting in an email, for example. The SHA-1 digests that you see in the manifest of a Sun-style digitally signed jar file are base64 encoded.
SHA-1 is a trap-door, one-way function. You can easily compute the SHA-1 digest of a document, but you can’t go backwards and compose a document with a given digest. SHA-1 is not an encryption method.
|Sizes of SHA Digests|
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