How to serialize the ciphertext encrypted by CPabe.py in charm crypto

[Jihane JEBRANE]

Hi, 

I want to serialize the ciphertext encrypted by CPabe.py using objectToBytes() but when I want to deserialize it by bytesToObject() and compute the cpabe.decrypt I found this error. 

" Invalid type: 1 not <type unicode > ".

Can someone help me solve this, please?

Thanks in advance,

Jihane.

[Edoardo Marangone]

Hi,

Do you have this problem with charm-crypto or with cake architecture?

Usually when the deserialization doesn't work there is a problem with some special unsupported characters. Please let me know which architecture you are using and I'll try to fix the problem.

Thank you,

Edoardo

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[Jihane JEBRANE]

Hi,

Thank you very much for the prompt reply. 

So basically, I'm trying to implement an auth protocol based on the CPabe scheme using a web socket in charm-crypto. 

This is a part of my code : 

def Server_state1(self, input):
group = PairingGroup('SS512')

cpabe = CPabe_BSW07(group)
msg group random(GT)
attributes = ['ONE', 'TWO', 'THREE']
access_policy = ' ((four or three_ and (three or one)) '
(master_public_key, master_key ) = cpabe.setup()
secret_key = cpabe.keygen(master_public_key,master_key, attributes)
cipher_text = cpabe.encrypt(master_public, msg, access_policy)               #  type (cipher_text) = dict
Ciph = objectToBytes(cipher_text, group)

p_k= objectToBytes( master_public_key  , group)

S_k= objectToBytes( secret_key , group)   
return {'cipher': Ciph, 'pk' : p_k, 'sk' : S_k}

def User_state3(self,input):
ciph_rec = input.get('cipher')

pk_rec = input.get('pk')

sk_rec = input.get('sk')
cipher_text = bytesToObject(ciph_rec, group)

public_key = bytesToObject(pk_rec, group)

Secret_key = bytesToObject(sk_rec, group)

decrypt_text = cpabe.decrypt(public_key, Secret_key, cipher_text)

print(decrypt_text)

### result

 " Invalid type: 1 not <type unicode > " 

I hope it's clear...

Thanks in advance,

Jihane.

To view this discussion on the web visit https://groups.google.com/d/msgid/charm-crypto/CAFvcX6J2A%2BZi7LP_tKNA4%3DkLLB2Y9hMFyJhTgS7PcRCyqUYhEg%40mail.gmail.com.

[Edoardo Marangone]

Maybe I've understood your problem. You can't serialize with an objectToBytes function the ciphertext. You have to do some work in order to obtain a serialization (and then a de-serialization). Check my code in CAKE in the 'ecoders_decoders.py' script. There you will find all the necessary passages to do to serialize (and deserialize) the ciphertext in a proper way.

I hope you can manage it.

Thanks,

Edoardo

To view this discussion on the web visit https://groups.google.com/d/msgid/charm-crypto/CAK7GECor2teSEARBO%3De6%3DRS4dZLSA9ONXhLhfu9aEUDfJ2CX0g%40mail.gmail.com.

[Jihane JEBRANE]

Hi, 

Thank you very much. I finally found out how to solve it using this link. I appreciate your help, sir.

https://stackoverflow.com/questions/43251642/how-to-serialize-store-the-ciphertext-encrypted-by-hybrid-cpabe-bsw07-in-charm

Best regards,

Jihane JEBRANE.

To view this discussion on the web visit https://groups.google.com/d/msgid/charm-crypto/CAFvcX6JoY1xZY4dc7gfiYSYBYwwGJRpurJ-wcBLwMNG17cCWMA%40mail.gmail.com.

[Edoardo Marangone]

Ok great, if you have any problems don’t hesitate to write me. 

Best regards,

Edoardo 

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From: charm-...@googlegroups.com <charm-...@googlegroups.com> on behalf of Jihane JEBRANE <jihan...@gmail.com>
Sent: Wednesday, September 7, 2022 7:51:14 PM
To: charm-...@googlegroups.com <charm-...@googlegroups.com>
Subject: Re: How to serialize the ciphertext encrypted by CPabe.py in charm crypto

 

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