javascript - Encryption: What is a tag? -

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i reading through node-forge documentation , keep seeing reference 'tag' variable. tag , meant for?

in examples given, they're using aes in galois/counter mode (gcm). gcm provides both confidentiality (similar ctr mode), , message integrity (similar if using hmac in addition aes).

the tag authentication tag. it's computed each block of ciphertext, , used verify no 1 has tampered data.

you can see these lines here:

var pass = decipher.finish(); // pass false if there failure (eg: authentication tag didn't match)  if (pass) {   // outputs decrypted hex    console.log(decipher.output.tohex()); }

where check made see if authentication tag validated correctly.


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