Repeatable encryption with RSA public key encryption

Hello

I have the following problem: I try to encrypt a byte array with an RSA public key encryption and want to get the same byte array encrypted for every call to doFinal().

Object*.
Two people (a and b) may share the same secret. Yet they don't trust each other until what they have confirmed that they share the same secret. To check if both share the same secret the following protocol apply (via a communication channel not secure assistance from person c they don't trust either). Also, there is no one which may help to establish trust (i.e. building confidence channels).

(1) generates the public key / private RSA
(2) a figure his secret with the RSA public key
(3) one sends the secret encrypted with its public RSA key for b
(4) b uses the RSA a public key to encrypt his secret
(5) in the case of the encrypted secret of a matches the secret encrypted b, then make (6), if a and b do not share the same secret, as they are in conversatzion
(6) b generates his own public key / private RSA
(7) b figure (not encrypted) secret with its private key
(8) b figure his secret (encrypted with its private key), as well as his public key with the public key of a
(9) b sends his secret (encrypted with its private key) and its public key in a
(10) one decrypts the secret and b public key with its private key
(11) one decrypts the secret with the public key of b
(12) checks if the secret received b acually meets that one knows = > trust established, finishing


So, I want to achieve is that the following code prints "true":
byte[] potentialSecret = new byte[]{1, 2, 3, 4, 5};
KeyPairGenerator kpg = KeyPairGenerator.getInstance(RSA);
kpg.initialize(512);
KeyPair kp = kpg.generateKeyPair();
PublicKey key = kp.getPublic();
Cipher c = Cipher.getInstance(RSA);
c.init(Cipher.ENCRYPT_MODE, key);
System.out.println(Arrays.equals(c.doFinal(xy), c.doFinal(xy)));
I tried to 'tinker' with initialization vectors, but still finished with the exceptions of various type.


Thank you very much
Bjoern


How can PS: btw, I markup code? It is my first assignment in the Oracle forums.

If your security is based on a secret that can be 8bits then you only 8bits of security. An attacker could send a request with their own key pair with all the data. The other party would return the text key and the encryption algorithm and then after less than 256 RSA cryptographic operations you have the secret (if it's 1 byte). You can then send the request with the correct secret.

See you soon,.
Shane

Tags: Java

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    Issuer: CN = SSO_CA, O = SAP - AG, C = OF
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    0010: D1 E1 73 E4 84 FE 0B FD 84 8 B 15 83 E5 1B 90 83... s.............
    0020: 43 81 62 84 B1 A1 E6 DA 50 14 02 01 64 02 9TH D3... C.b... P...d.
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    0000: B3 C5 8 66 92 F4 CC D7 ED 6 51 12 63 52 18 B9... f... mQ.c... R.
    0010: B8 A6 78 7 78 18 ED F7 DA 71 09 AE 49 23 C8 C9... .. x...x. q... I have #.
    0020: F5 2F 32 0F D1 C0 08 4 2 B 6 D 3 C B9 5F 5B B5 11. 2 /... L + m <... _ [.]
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    94 0040:48 8 c 0D 77 92 59 34 6 77 1 a 24 FE E3 C1 H...w. Y .4nw$...
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    0060: 83 EA 2D 6a CA 7F C3 84 37 15 FE 99 73 1 D 7 C D1... - j... 7... s...
    0070:6 B4 99 09 62 B9 0F 18 33 4 66 C6 7 a 9F C0 DB m... b... 3L. FZ...

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