adding noise blob to data before signing

[Eugen Leitl]

1) What's the name of the technique of salting/padding an small integer 
   I'm signing with random data?

2) If I'm signing above short (~1 kBit) sequences, can I sign them 
   directly, or am I supposed to hash them first? (i.e. does a presence
   of an essentially fixed field weaken the signature)


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