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Verifiable Encryption

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Encyclopedia of Cryptography and Security
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Definition

Verifiable encryption is an encryption scheme where one can prove some property of a message m, while the message is given in an encrypted form. When an encryption scheme is secure, the encryption E(m) should reveal no information regarding m. But this property may not be suitable in cases where checking some property of the encrypted content is required before processing the encrypted data. Verifiable encryption allows a verifier to check certain property of the content that is encrypted.

Applications

An example of such a case is a key escrow_scheme. In a typical key escrow scheme, when a sender sends an encrypted message, he is required to encrypt the key which he used to encrypt the message, and the encryption of the key is by using the escrow agent’s public key. This way, the escrow agent can always obtain the key used to encrypt the message, and thus the escrow agent can read the message. However, the sender can fool the escrow...

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Recommended Reading

  1. Camenisch J, Damgård I (2000) Verifiable encryption, group encryption, and their applications to separable group signatures and signature sharing schemes. In: Okamoto T (ed) Proceedings of AłSIACRYPT 2000, Lecture notes in computer science, vol 1976, Springer, Berlin, pp 331–345

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  2. Camenisch J, Shoup V (2003) Practical verifiable encryption and decryption of discrete logarithms. In: Boneh D (ed) Proceedings of CRYPTO 2003, Lecture notes in computer science, vol 2729, Springer, Berlin, pp 126–144

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Sako, K. (2011). Verifiable Encryption. In: van Tilborg, H.C.A., Jajodia, S. (eds) Encyclopedia of Cryptography and Security. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-5906-5_24

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