What is e-TS?

Why do we need e-TS?

How does e-TS work?

What is the technology behind?

	Cryptography
	Hashing
	Public Key Infrastructure (PKI)
	Digital certificate
	Digital signature
	Time source

Hashing is the transformation of a data file into a shorter and unique value that represents the original file. A hash value is like the fingerprint of a file.

If the file content is changed by even one character, a different hash value will be generated. With the hashing technique, a user can detect whether a file has been modified.

Hashing is a one-way operation, so it is impossible to "reverse engineer" any contents of the original file by analyzing the hash value.